What pattern do you see as you compare elements that belong in groups 1A to 8A on the Periodic Table?
Answers
Since all of the elements are metals in group IA have one valence electron in their outermost shell, they all react violently, and as you move down the group, the reactivity gets progressively worse. Because Group VIIIA has a complete valence shell, they are non-reactive
The group 1 elements Li, Na, K, Rb, Cs, and Fr are alkali metals. When sliced, the alkali metals are all supple, metallic, and lustrous. They are good electrical conductors, have low melting temperatures and densities, and react readily with water. Each of them has a valence electron that they can readily lose to produce ions
Group 8 elements (or VIIIA) of the periodic table are the noble gases or inert gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn)
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Related Questions
the process of expelling urine from the urinary bladder is called urination or
Answers
The process of expelling urine from the urinary bladder is called urination or micturition.
Urination or micturition are terms used to describe the act of releasing urine from the bladder. The ability of the urinary system to remove waste and maintain fluid balance is a crucial bodily function. The coordinated activity of several tissues, including the bladder, urethra, and related muscles, is required for the complicated process of urination. Sensational signals are delivered to the brain when the bladder is full, which causes the conscious need to pee. Urination can be started and controlled by using voluntary control of the external urethral sphincter. When urinating, the bladder contracts and the pee leaves the body through the urethra.
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Which are true about an ion?
Check all that are true.
It will always have more neutrons than protons.
It can have a negative charge.
It will always have fewer neutrons than protons.
It can have a positive charge.
Answers
Correct Answer:
1) It can have a negative charge.
2) It can have a positive charge.
Explanation:
1) If the atom has more electrons than protons, it is a negative ion
2) If it has more protons than electrons, it is a positive ion.
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TRUE/FALSE. The enzyme and the substrate are joined for an extremely long period of time.
Answers
False. The enzyme and substrate are not joined for an extremely long period of time.
How long are enzymes and substrates joined?Enzymes are biological catalysts that increase the rate of a chemical reaction by lowering the activation energy required for the reaction to occur. The enzyme achieves this by binding to the reactant molecules, or substrates, at its active site, forming a temporary enzyme-substrate complex. During this time, the enzyme changes its shape to better fit the substrate, which facilitates the reaction between the substrate molecules.
Once the reaction is complete, the products are released, and the enzyme is free to bind to another substrate molecule and continue the catalytic cycle. Therefore, the enzyme and substrate are not joined for an extremely long period of time. The binding and unbinding of the substrate to the enzyme's active site are dynamic processes, and the enzyme does not hold onto the substrate permanently.
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Which of the fuel reserves are NOT resourced majorly from liver? A) Glucose B) Fatty acid. C) Creatine phosphate. D) Ketone bodies.
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The fuel reserve that is NOT primarily resourced from the liver is creatine phosphate. Glucose, fatty acids, and ketone bodies can all be synthesized or metabolized by the liver to provide fuel for the body. However, creatine phosphate is primarily stored in muscle tissue and is used as a quick source of energy during muscle contractions.
The primary high-energy phosphate-storage molecule in muscle is creatine phosphate. Creatine phosphate is the most common form in rested muscle; its maximum concentration is five times higher than that of ATP.
When the muscle starts to contract and needs energy, the creatine kinase transfers its phosphate back to ADP to form ATP and creatine during times of acute energy need. The enzyme creatine kinase is the catalyst for this rapid reaction; Consequently, ATP derived from creatine phosphate powers the first few seconds of muscle contraction.
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Which part of Pakicetus anatomy most suggests that it is an ancestor of whales?
OPTIONS
Eyes near the top of the head
Ears adapted partly for hearing underwater
Teeth consistent with a carnivorous diet
Four legs
Answers
The part of Pakicetus anatomy that most suggest it is an ancestor of whales is ears adapted partly for hearing underwater.
Pakicetus is an extinct early mammal believed to be closely related to the ancestral line of whales. One of the key pieces of evidence supporting this relationship is the structure of its ears. Pakicetus had specialized ear bones that show adaptations for hearing underwater.
The ear structure of Pakicetus contains a specialized bone known as the involucrum, which is similar to the ear bones found in modern whales. The involucrum is thickened and dense, indicating adaptations for underwater hearing. This adaptation suggests that Pakicetus and its descendants gradually transitioned to an aquatic lifestyle and relied on hearing underwater, a feature that is prominent in modern whales.
While other options, such as eyes near the top of the head and teeth consistent with a carnivorous diet, may also be present in whales, it is the presence of ears adapted for hearing underwater that provides strong evidence of the evolutionary link between Pakicetus and the ancestors of whales.
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the brainstem is one of the evolutionarily oldest structures in the brain because it is responsible for
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The brainstem is one of the most primitive structures in the brain and is responsible for regulating many of the basic functions necessary for survival.
It controls autonomic functions such as heart rate, blood pressure, respiration, digestion, and arousal. Additionally, it serves as a conduit for nerve impulses between the brain and spinal cord.
The brainstem is made up of three parts: the medulla oblongata, the pons, and the midbrain. Each of these regions has a specific function and is involved in regulating different aspects of behavior and physiology. Overall, the brainstem plays a critical role in maintaining homeostasis and keeping the body in a state of balance.
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what was used to dispute continental drift
Answers
Answer:
In the past, there were various pieces of evidence that were used to dispute the idea of continental drift, which is the theory that suggests that continents have moved over time. These pieces of evidence were put forward by scientists who did not believe in the concept of continental drift.
Explanation:
Here are a few examples:
Lack of Mechanism: One argument against continental drift was the lack of a known mechanism that could cause the continents to move. Scientists questioned how continents, which are large land masses, could shift and change their positions without any clear explanation.
Fixed Continents: Another argument was that continents seemed to be fixed in their positions. Scientists believed that the continents were immovable and had always been in their current locations. They argued that the shapes of the continents fit together like puzzle pieces simply because they happened to look that way, not because they were once connected.
Gravitational Forces: Some scientists proposed that gravitational forces were responsible for the arrangement of continents. They suggested that the distribution of land masses on Earth was due to variations in gravity, rather than the movement of the continents themselves.
Geological Stability: The stability of the Earth's crust was also used as evidence against continental drift. Scientists believed that the Earth's crust was rigid and could not undergo significant movements or changes in shape.
However, over time, new evidence emerged, such as the discovery of mid-ocean ridges and magnetic anomalies, which supported the theory of continental drift. This led to the development of the theory of plate tectonics, which explains how the Earth's lithosphere (crust and upper mantle) is divided into several large plates that move and interact with each other, causing continental drift and other geological phenomena.
What is a sagebrush's adaptations ?
help
Answers
Answer:Like many species of the coastal sage scrub, California sagebrush has adapted to summer drought by becoming dormant or semi-dormant during dry months. Winter-spring leaves are feathery and thin and support high rates of photosynthesis; consequently they also have high rates of water loss.
Explanation:
How does subsistence affect culture?
from anthropology perspect
Answers
Subsistence, referring to the way people obtain their basic needs, has a profound impact on culture. It influences social structures, division of labor, values, beliefs, and daily practices within society.
Explanation:
From an anthropological perspective, subsistence plays a crucial role in shaping culture. Subsistence refers to the means by which people obtain their basic needs, including food, water, shelter, and resources. The way society meets these needs influences various aspects of its culture.
Subsistence strategies, such as foraging, pastoralism, horticulture, agriculture, or industrialization, determine how people organize themselves socially, their division of labor, and their relationship with the natural environment. For example, nomadic hunter-gatherer societies have different social structures and mobility patterns compared to sedentary agricultural societies.
Subsistence practices also impact values, beliefs, and daily practices within a culture. The methods of food production and availability shape culinary traditions, religious rituals, and social norms related to food sharing and distribution. Subsistence strategies influence the development of technology, artistic expressions, and economic systems within society.
Overall, subsistence is deeply intertwined with culture as it shapes the social, economic, and symbolic aspects of society. Understanding a community's subsistence practices provides valuable insights into its cultural patterns, social organization, and worldview.
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Describe the form of a polymer. Why is this shape beneficial to creating plastics?
Answers
Answer:
The four basic polymer structures are linear, branched, crosslinked, and networked.Plastics are polymers. A polymer is a substance made of many repeating units. The word polymer comes from two Greek words: poly, meaning many, and meros, meaning parts or units. A polymer can be thought of as a chain in which each link is the “mer,” or monomer (single unit).
12. In the process of reproduction, meiosis contributes to genetic variation within a population by producing cells A that are genetically identical to one parent. B with genetic traits identical to those of both parents. C with a combination of traits from each parent. D that are genetically unlike either parent.
Answers
Answer:
C. with a combination of traits from each parent.
With respect to F+ and F- bacterial matings, answer the following questions:
(a) How was it established that physical contact between cells was necessary?
(b) How was it established that chromosome transfer was unidirectional?
(c) What is the genetic basis for a bacterium’s being F+?
Answers
Concerning F+ and F- bacterial matings, it can be said that (a) the necessity of physical contact was proved through Lederberg and Tatum's experiments, (b) experiments by Hayes et al. in 1952 proved the unidirectional nature of chromosome transfer, and (c) the genetic basis for a bacterium's being F+ is the presence of a fertility (F) factor.
Concerning the mentioned bacterial matings, we can tell that (a) Lederberg and Tatum discovered that E. coli cells could exchange genetic material through a process, i.e., bacterial conjugation. They showed that when F+ cells and F- cells were mixed in a culture, the F+ cells transferred genetic material to the F- cells only when physical contact was established between them.
(b) Hayes et al. observed that F+ cells could transfer genetic material to F- cells, but the F- cells could not transfer genetic material back to the F+ cells. This led them to conclude that chromosome transfer during bacterial conjugation was unidirectional.
(c) The fertility factor (F factor) contains genes that encode for the production of a pilus, a thin filamentous structure that allows the F+ cells to attach to F- cells and transfer genetic material.
The F factor can also exist as a plasmid (a circular piece of DNA separate from the bacterial chromosome). Bacteria that contain the F factor are referred to as F+ cells, while those that do not have the F factor are referred to as F- cells.
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explain how these microbes have affected the world population does this new evidence change the sea in killer whale relationship does this new relationship provide a sigmoid or peak phenomenon please provide supporting details
Answers
Microbes have had a significant impact on the world population by influencing human health, agriculture, and the environment.
Microbes play a crucial role in human health as they can cause infectious diseases but also provide essential functions in our bodies, such as aiding in digestion and supporting the immune system. They also impact agriculture by promoting plant growth, aiding nutrient cycling, and acting as biocontrol agents against pests. Furthermore, microbes contribute to the overall health of ecosystems by participating in nutrient cycling, decomposing organic matter, and influencing climate patterns.
Regarding the relationship between killer whales and the sea, it is important to note that killer whales are apex predators in the marine ecosystem and are not directly affected by the microbial world population. However, changes in the microbial communities within the marine environment can indirectly influence the availability and quality of prey for killer whales, potentially affecting their population dynamics.
As for whether this new relationship provides a sigmoid or peak phenomenon, it is not clear based on the information provided. A sigmoid phenomenon typically refers to a gradual increase followed by a leveling off, while a peak phenomenon suggests a sharp increase followed by a decline. Without specific details about the new evidence or its implications on the killer whale-sea relationship, it is difficult to determine the specific pattern exhibited.
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Facilitated transport does not require the cell to use energy because moving molecules from areas of
higher concentration to areas of lower concentration is powered by diffusion.
Is this statement True or False?
Answers
Answer:
Facilitated transport does not require the cell to use energy because moving molecules from areas of
higher concentration to areas of lower concentration is powered by diffusion.
True
Explanation:
Answer:
True
Explanation:
The Statement is true because, diffusion involves the movement of individual molecules of a substance through a semipermeable barrier/membrane from a region of high concentration to a region of lower concentration without energy as a requirement.
scientists were looking at 2 genes in dogs that control coat color. they bred two dogs together, one with golden fur and one with black fur, their puppies showed a ratio of 12, 3, 1 for combinations of those genes, what phenomena is on display here?
Answers
The phenomena showed a ratio of 12, 3, 1 for combinations of two dogs (golden fur and black fur) as dominant epistasis.
The interаction between two dogs together, one with golden fur and one with black fur, color is recessive to no color аt one аllelic pаir. This recessive аllele must be expressed before the specific color аllele аt а second locus is expressed. Аt the first gene golden colored dog is dominаnt to the black colored dog, аnd the gene symbols аre G = golden аnd g = colored. Аt the second gene balck is dominаnt to golden, аnd the symbols used аre B = black, b = colored. If the dihybrid is selfed, three phenotypes аre produced in а 12:3:1 rаtio.
9 G_B_ Golden Dominant golden allele negates effect of G allele
3 G_bb Black Dominant black allele negates effect of G allele
3 ggB_ Golden Recessive color allele allows golden allele expression
1 ggbb Black Recessive color allele allows black allele expression
Becаuse the presence of the dominаnt G аllele mаsks the effects of either the B or g аllele, this type of interаction is cаlled dominаnt epistаsis.
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I need helppp!!!!!!!!
Answers
Answer:
B - 6 picograms
Explanation:
When a cell divides mitotically, the end result is 2 identical daughter cells. With that being said, the cell that is produced will also have the same amount of DNA and, therefore, the same DNA mass of 6 picograms.
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After you set up a fish tank, you are sure to see algae growing in it. There is plenty of light, fertilizer in the form of fish droppings, and plants or glass for algae to cling to. You may see green strings of algae in the water or green spots growing on the glass. Your whole aquarium can turn green if you don’t stop the algae. To prevent the problem, you can add algae-eating fish or microorganisms to the water. Covering the aquarium for a few days will also kill algae, which need photosynthesis to survive.
Multi-celled algae grow into larger organisms through cell division. For one-celled algae, the purpose of cell division is
.
Answers
Answer:
tissue growth and maintenance
Explanation:
Which organelle stores water and helps to maintain the plant cell shape? (4 points)BНЕAreFGH
Answers
H. Vacuole
The central vacuole is the organelle able to store water and also maintain the cell shape. It`s sorrounded by a membrane and contains many dissolved substances.
Which of the cranial nerves listed below do not have branches to the tongue? 1. Mandibular 2. Facial 3. Glossopharyngeal 4. Accessory 5. Hypoglossal
Answers
The Accessory nerve (CN XI) is the only cranial nerve among the options listed that does not have branches to the tongue.
The Accessory nerve primarily innervates the sternocleidomastoid and trapezius muscles, which are responsible for head movement and shoulder elevation.
In contrast, the mandibular branch of the trigeminal nerve (CN V3) innervates the anterior two-thirds of the tongue, while the facial nerve (CN VII) and glossopharyngeal nerve (CN IX) innervate the taste buds on the anterior two-thirds and posterior one-third of the tongue, respectively.
The hypoglossal nerve (CN XII) innervates the intrinsic and extrinsic muscles of the tongue, allowing for tongue movement and speech.
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Why was the evolution of cyanobacteria such a significant event in Earth's history?
Answers
Answer:
Cyanobacteria are blue-green algae that produce chlorophyll and undergo photosynthesis. Oxygen, a byproduct of that photosynthesis, was released into the atmosphere, changing it in such a way that it may have allowed the evolution of more complex forms of life.
Explanation:
Right on ED2021 practice, goodluck! :) Happy holidays!
I'm asking this out of personal curiosity, not for school. but it's still for educational purposes kinda, so I hope it's okay.
If a flower is wilted, but not totally dead and withered yet, is the flower dead and it's dead flower body is in the process of decomposing, or is the flower like in the flower stage of being an old person, it lived and now it's old, but not dead yet?
Here's an example of the flower stage I mean. ^-^
Answers
To put it simply, the flower is not dead yet, it’s just “old” :D
what amino acids are most likely to be found in the core of a water-soluble globular protein? hydrophobic negatively charged positively charged polar but uncharged
Answers
Hydrophobic (fearful of water) amino acids are mostly found inside globular proteins (option A)
Globular proteins are the most abundant proteins in nature and are named after their roughly spherical shapes. The globular proteins come in a wide range of three-dimensional structures. Almost all globular proteins contain a significant number of -helices and -sheets folded into a compact structure stabilized by both polar and nonpolar interactions. The globular three-dimensional structure forms spontaneously and is maintained by interactions between the amino acid side chains. Most of the time, the hydrophobic amino acid side chains are buried, tightly packed, in the interior of a globular protein, away from water.
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I need someone to explain this
Answers
compare between trypsin and pepsin enzyme ?
Answers
Pepsin is an enzyme which acts only in acidic medium ,trypsin is an enzyme which acts in alkaline medium. pepsin is secreted by gastric juice, trypsin secreted by pancreatic juice. Pepsin is secreted in stomach, trypsin is secreted in small intestine. Pepsin is situated in gastric glands, trypsin is situated in pancreas.
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What molecule acts as an electron acceptor in glycolysis.
Answers
Answer:
NADH
Explanation:
where do cells fall in the levels of organization of living things
Answers
Answer:
Tissues exist within organs, which exist within organ systems. Communities exist within populations, which exist within ecosystems. Organelles exist within cells, which exist within tissues. Communities exist within ecosystems, which exist in the biosphere.
Explanation:
Choose the correct statements.
Many scientific questions were answered
There are no alternate hypotheses that explains the extinction of the dinosaurs
We cannot be 100% certain that an asteroid killed the dinosaurs
Walter's hypothesis remained the same throughout his journey
Answers
The correct statement: We cannot be 100% certain that an asteroid killed the dinosaurs.
Explain the Dinosaur Extinction Theory?Paleontologists are working to determine what led to the extinction of all non-avian dinosaurs 65 million years ago.
While researchers continue to argue how volcanism or climatic change brought on by receding sea levels may have contributed, the majority of experts think that a huge asteroid or comet impact played a significant influence. However, several proposed theories for the demise of nonavian dinosaurs were categorically untrue, according to paleontologists.Since 19th-century naturalists began researching the extinct animals, our understanding of how dinosaurs died has undergone significant shift. Following one of the biggest mass extinctions in the history of our planet, caused by a devastating asteroid impact, extensive volcanic activity, and climatic change, most dinosaur lineages vanished by roughly 66 million years ago, according to paleontologists.Thus, the correct statement is-
We cannot be 100% certain that an asteroid killed the dinosaurs.
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Select the function of the centromere in the transmission of genetic information O O O O O the production of ribosomal subunits the duplication of DNA the attachment point for sister chromatids the formation of the mitotic spindle the production of energy to drive cell division
Answers
The function of the centromere(Cm) in the transmission of genetic information is the attachment point for sister chromatids(SC). The centromere is located in the middle of the chromosome. In order for chromosomes to be properly aligned during cell division, the centromere must be precisely located.
What is a centromere?A centromere is a chromosome segment that functions as a spindle fiber attachment site during cell division and is critical for equal segregation of the duplicated genome between daughter cells. The point where the sister chromatids are attached to each other is the centromere. During mitosis(Mit), the two chromatids are pulled apart from each other by spindle fibers(SF) connected to the centromere.
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give two major differences between prokaryotes and eukaryotes
Answers
Answer:
Eukaryotic cells contain membrane-bound organelles, such as the nucleus, while prokaryotic cells do not. Differences in cellular structure of prokaryotes and eukaryotes include the presence of mitochondria and chloroplasts, the cell wall, and the structure of chromosomal DNA.
Explanation:
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True or False: Carbon dioxide is a product of combustible fossil fuels and only comes from humans burning fossil fuels.
Answers
Answer: True
Explanation: When they burn they release a lot or big amounts of carbon dioxide it releases carbon dioxide into the air
Fossil fuel combustion results in significant carbon dioxide emissions. Carbon dioxide emissions trap heat in the atmosphere, resulting in climate change.
What result of combustion of fossil fuel in an ecosystem?Fossil fuel combustion, especially in the transportation and electricity sectors, is responsible for around three-quarters of the country's carbon emissions.
When they burn, they emit large or frequent amounts of carbon dioxide into the atmosphere.
As a result, for the past 40 years, the amount of carbon dioxide in the atmosphere has been increasing by an average of 0.14% annually.
Fossil fuels are created when buried, carbon-based creatures that died millions of years ago decompose. They produce deposits rich in carbon, which are taken out and burned to provide energy.
Therefore, it is true that Carbon dioxide is a product of combustible fossil fuels and only comes from humans burning fossil fuels.
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