(2) Which of the following describes the movement of particles down/ with a concentration gradient and how ?
Question options:
a)
Osmosis
b)
active transport
c)
diffusion
d)
both osmosis and diffusion
Answers
Answer:
Both osmosis. And diffusion
Related Questions
Which type of biomolecule contains phosphorus? A. Nucleic acid B. Protein C. Carbohydrate D. Lipid
Answers
Answer: Nucleic Acids should be the answer.
Explanation:
Hydrogen, oxygen, nitrogen, carbon, and phosphorus combined and placed under one umbrella term, Biomolecule, are known as one thing; the Nucleic Acids.
Q5. DIRECTION: Read and understand the given problem / case. Write your solution and answer on a clean_paper with your written name and student number. Scan and upload in MOODLE as.pdf document before the closing time. Evolution determines the change in inherited traits over time to ensure survival. There are three variants identified as Variant 1 with high reproductive rate, eats fruits and seeds; Variant 2, thick fur, produces toxins; and Variant 3 with thick fur, fast and resistant to disease. These variants are found in a cool, wet, and soil environment. In time 0 years with cool and wet environment, the population is 50,000 with 10,000 Variant 1, 15,000 Variant 2, and 25,000 of Variant 3 . Two thousand years past, the environment remained the same with constant average temperature and rainfall. A disease spread throughout the population. However the population increased to 72,000 . Calculate the population percentage of each variant in O years. (Rubric 3 marks)
Answers
Given problem:Evidence proves that evolution determines the change in inherited traits over time to ensure survival. There are three variants identified as Variant 1 with high reproductive rate, eats fruits and seeds; Variant 2, thick fur, produces toxins; and Variant 3 with thick fur, fast and resistant to disease.
These variants are found in a cool, wet, and soil environment. In time 0 years with cool and wet environment, the population is 50,000 with 10,000 Variant 1, 15,000 Variant 2, and 25,000 of Variant 3. Two thousand years past, the environment remained the same with constant average temperature and rainfall. A disease spread throughout the population. However, the population increased to 72,000. Calculate the population percentage of each variant in O years.Solution: Population of Variant 1 = 10,000Population of Variant 2 = 15,000Population of Variant 3 = 25,000Total Population at time 0 years = 50,000 years Total population after 2000 years = 72,000 Population increased in 2000 years = 72,000 - 50,000= 22,000 We know that in the 2000 years, a disease spread throughout the population but the environment remained the same with constant average temperature and rainfall.Therefore, each of the variants had equal chances of dying due to the disease.
Therefore, we can assume that the percentage of each variant in the population at time O years will be the same as the percentage of each variant in the population after 2000 years.(As no data is provided regarding the reproduction rate, mutation rate or migration of the variants we can't assume their effect on the population percentages)Hence,Population percentage of Variant 1 = (10,000 / 72,000) × 100%= 13.89%Population percentage of Variant 2 = (15,000 / 72,000) × 100%= 20.83%Population percentage of Variant 3 = (25,000 / 72,000) × 100%= 34.72%Therefore, the percentage of Variant 1, Variant 2, and Variant 3 in the population at O years is 13.89%, 20.83%, and 34.72% respectively. Therefore, the percentage of Variant 1, Variant 2, and Variant 3 in the population at O years is 13.89%, 20.83%, and 34.72% respectively.
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Explain how to distinguish different species by their DNA.
Answers
DNA analysis can be used to distinguish different species by comparing specific regions of their DNA sequences.
To distinguish different species by their DNA, scientists primarily focus on comparing specific regions of the DNA sequences that are highly variable among species. One commonly used region is the mitochondrial DNA (mtDNA), which is inherited maternally and has a higher mutation rate compared to nuclear DNA. Another region is the ribosomal RNA genes (rRNA), which exhibit variations among species.
The process typically involves extracting DNA samples from different organisms, isolating the target region of interest, and sequencing the DNA to determine the nucleotide sequence. The sequences obtained from different species are then compared to identify differences and similarities.
These differences can be used to create DNA profiles or genetic markers specific to each species. Advanced techniques such as DNA barcoding or whole-genome sequencing can provide more comprehensive information and aid in species identification.
By comparing DNA sequences, scientists can uncover genetic variations unique to different species, allowing them to distinguish and classify organisms accurately. This information is valuable in various fields, including taxonomy, conservation biology, forensic science, and evolutionary research.
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A lab tech is analyzing water samples and notices that one of her samples is more green. What does this tell her about the sample?
It absorbs light in the red frequency range.
It contains atoms with the same vibrational frequency as the red light waves.
It contains atoms with the same vibrational frequency as the green light waves.
It reflects light in the green frequency range.
Answers
Answer:
It reflects light in the green frequency range.
Why is visualization not sufficient to properly identify bacteria?
A. Bacteria have a limited set of shapes.
B. Identification is only needed in clinical specimens.
C. Many unrelated bacteria can share the same shape.
D. Bacteria have a limited set of shapes and many unrelated bacteria share the same shape.
E. Not all bacteria can be seen with a light microscope.
Answers
Visualization not sufficient to properly identify bacteria the correct option is (D). Bacteria have a limited set of shapes and many unrelated bacteria share the same shape.
Some bacteria, known as vibrio, have comma- or rod-like shapes; others might have spiral or tightly wound shapes, known as spirilla or spirochaetes. A few more uncommon shapes, including microorganisms in the form of stars, have been described.
Numerous bacterial species only exist as solitary cells, while others create distinctive associations. For example, Neisseria forms diploids (pairs), streptococci form chains, and staphylococci cluster into "bunch of grapes"-like clusters.
Soil, water, acidic hot springs, radioactive waste, and the deep biosphere of the Earth's crust are all home to bacteria. Through the recycling of nutrients, such as the fixation of nitrogen from the atmosphere, bacteria are essential at many phases of the nutrition cycle. The decomposition of dead corpses is a part of the nutrient cycle; bacteria are in charge of the putrefaction phase of this process.
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HELP QUICK . Come up with an explanation as to why there is some advantage to a dark mouse in a lighter habitat
but not lighter mice in darker environments ?
Answers
The darker mouse could hide in the shadows easier where hunters won't look and a lighter mouse in. darker habitat would stand out more than anything around it and result in it being easy prey.
I hope this helps ^^
The advantage to a dark mouse in a lighter habitat but not lighter mice in darker environments is predators could more easily spot the dark mice on light sand.
What are the characteristics of predators?Predators are organisms that hunt and kill other organisms for food. The organisms that are consumed by the predators are known as the prey. Predators can be carnivores and omnivores.
There are four commonly recognized types of predation: (1) carnivory, (2) herbivory, (3) parasitism, and (4) mutualism. Each type of predation can by categorized based on whether or not it results in the death of the prey.
Some examples of predator and prey are lion and zebra, bear and fish, and fox and rabbit. The words "predator" and "prey" are almost always used to mean only animals that eat animals, but the same concept also applies to plants.
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Sara finds a cross-section of a tree trunk from a nearby timber-cutting operation. While counting the rings, Sara notices that the ring that corresponds to ten years ago is very narrow and dark. She researches newspaper weather reports for that period. Based on the tree-ring evidence, which of the following reports is she likely to discover?
F.Ten years ago, the summer was very humid.
G.Ten years ago, several hurricanes came through the area
H.Ten years ago, there was an abundance of rain and sunshine
I.Ten years ago, the weather was unseasonably cold, overcast, and dry.
Answers
Sara is likely to discover the report I. Ten years ago, the weather was unseasonably cold, overcast, and dry. The narrow and dark tree ring indicates that there was limited growth during that year, which is typically associated with unfavorable environmental conditions like cold, overcast, and dry weather.
Sara found a cross-section of a tree trunk and noticed that the ring that corresponds to ten years ago is very narrow and dark. This suggests that the tree did not receive enough water and nutrients during that year, which could be caused by unfavorable weather conditions. Sara decides to research newspaper weather reports for that period to find out more information. After conducting her research, Sara discovers that ten years ago, the weather was unseasonably cold, overcast, and dry. This information matches the evidence from the tree ring, as the narrow and dark ring suggests that the tree did not receive enough water and nutrients during that year. The dry and cold weather conditions could have caused this, as the tree would not have been able to absorb enough moisture from the soil.
Based on the evidence from the tree ring and the newspaper weather reports, it can be concluded that ten years ago, the weather was unseasonably cold, overcast, and dry. This information is important because it shows how weather conditions can affect the growth of trees and other plants. By studying tree rings and weather patterns, researchers can learn more about past climates and make predictions about future climate change.
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Which of the following would NOT increase the rate at which something dissolves? *
A. increase temperature
B. decrease temperature
C. crush solute
D. stir the solution
Answers
Answer:
B
Explanation: Decreasing the temperature will not make the increase rate at which something dissolves quicker it would only make it go slower.
a bacterial culture grown in a glucose-peptide medium causes the ph to increase. the bacteria are most likely group of answer choices using the peptides. not growing. fermenting the glucose. oxidizing the glucose.
Answers
If a bacterial culture grown in a glucose-peptide medium causes the pH to increase, then the bacteria are most likely fermenting the glucose.
During fermentation, bacteria convert glucose into other organic compounds such as lactic acid or acetic acid. This process can lead to a decrease in pH due to the release of acidic byproducts. However, if the pH is increasing, then it suggests that the bacteria are using an alternative pathway to metabolize the glucose, such as fermentation to produce neutral or alkaline end products like ethanol, carbon dioxide, or acetone.
The peptides in the medium are not likely the cause of the pH increase since they are generally not metabolized in a way that would affect pH. And if the bacteria were oxidizing the glucose, it would result in the production of acidic compounds, which would lower the pH rather than raising it.
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VERY URGENT:
Units that are combinations of two or more fundamental/base units are called (blank) units
Fill in the blank
Answers
Answer:
Derived Units
Explanation:
Answer:
Derived unit
Explanation:
The fundamental unit is Derived unit
proteins provide an important dietary source of which mineral element?
Answers
Phosphorus. A mineral called phosphorus supports the health of your bones.Additionally, it keeps muscles and blood vessels functioning.Foods high in protein, including such meat, chicken, fish, nuts, beans, or dairy products, naturally contain phosphorus.
What minerals are necessary for the production of proteins?Proteins are crucial biomolecules that play a vital role in a variety of crucial and fundamental life-related processes.Nitrogen is a crucial component of amino acids and is required in the production of proteins.
What elements are found in minerals?The macrominerals calcium, silicon, magnesium, hydrogen, phosphorus, sodium, nitrogen, potassium, silicon, magnesium, oxygen, selenium, and sulphur are often needed in considerable quantities by the plant tissues.
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PLEASE HELP
"Watermelon snow" in Antarctica is caused by a species of photosynthetic green algae that thrives in subzero temperatures (Chlamydomonas nivalis). These algae are also found in high altitude in year-round snowfields. In both locations, UV light levels tend to be high. The reddish-pink color of these algae is due to the presence of carotenoid pigments, which absorb blue light while reflecting red light. Those pigments protect the chloroplast from ultraviolet radiation, as well as absorbing heat, which provides the algae with liquid water as the snow melts around it. This molecular variation in plants illustrates
A. relative fitness because the molecular adaptations in chlorophyll pigments have passed to the next generation
B. innate variability because plants have evolved molecular differences to an environmental stimuli
C. unselective adaptation because plants have evolved molecular differences to adapt to different wavelengths of light
D. inclusive fitness because differences in chlorophyll pigments increase the proliferation of beneficial traits in the population
Answers
The Answer is D
im not sure this is correct answer
How can we determine the relative rock layers and their geological time period?
Answers
Answer:
The deeper the rock layer, the more older fossils are found
Explanation:
layers that are found deeper are older than those found in layers near the surfac
Which correctly describes Earth's population over the centuries?
O A. It has risen steadily.
B. It has remained steady overall.
C. It has risen at an increasing rate.
O D. It has declined in some places due to migration.
SUBM
Answers
It has risen at an increasing rate throughout time. This rate hasn’t been steady due to many reasons. See the attached photo for details.
Hope this helps! Please make me the brainliest, it’s not necessary but appreciated, I put a lot of effort and research into my answers. Have a good day, stay safe and stay healthy.
Earth's population over the centuries has risen at an increasing rate. So, the correct option is C.
How the population of Earth is increasing?This sharp increase in population has been primarily caused by an increase in the proportion of individuals reaching breeding age, the gradual extension of human life expectancy, growing urbanization, and quickening migration. This expansion has been accompanied by significant changes in the fertility rate.
One of the key reasons for India's population expansion is a drop in death rates brought on by better medical services and a steady birth rate. The widespread illiteracy in India makes people believe that "children are god's blessings," which makes them opposed to the idea of "family planning." Earth's population over the centuries has risen at an increasing rate.
Therefore, the correct option is C.
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Sohan was a very active and a social child. He used to come forward for anybody help. One day he attended a blood donation camp and was ready to donate blood, but his blood test was done and he was HIV+ve. Therefore he was very upset and lost his interest in all activities and remained absent from school for long time. Rajiv, his friend met him and counselled him.He (Sohan) was back at school. a) What sense of responsibility did Rajiv show? b) A HIV+ve person should be isolated. Do you agree with this statement. Justify your answer?
Answers
Explanation:
(a) After vis friends comforted him he went back to school.
(b) No. HIV can only be caught by another person of they come in contact with your blood or through sexual intercourse. So it is not possible for others to become infected if they didn't come in contact with the person's blood or have unprotected intercourse. There is no reason for a HIV+ve person to isolate themself from the outside world. They are people just as we are but they only have something that can cause them to be really sick.
what is a weakness or limitation for using orbeez as a model for a cell?
Answers
Answer:
You cant make the organells that detailled or make them at all for that matter?
Explanation:
light passes through the entire thickness of the neural layer of the retina to excite the photoreceptors.
A) True
B) False
Answers
Answer:
A. True
light passes through the entire thickness of the neural layer of the retina to excite the photoreceptors.
The hypothalamus is the part of the brain that regulates __________. A. Hunger B. Food preference C. Achievement motivation D. The need for acceptance.
Answers
The hypothalamus is a region of the brain present near the pituitary gland. The hypothalamus is the part of the brain that regulates hunger.
The correct option is A.
What is Hypothalamus?Hypothalamus is a small part of the brain present at the base of the brain.
It regulates daily psychological activities and controls the release of hormones.
Thus, the correct option is A, hunger is regulated by the hypothalamus.
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Answer:
a
Explanation:
1)why stomata genrally opens during day time ?
2)which parts of plant intake CO2 and give out O2 , takes in O2 and give out CO2 during day time ?
Answers
Which term describes the relationship in which one organism lives inside the other one. Check ih correct answer
Answers
Answer:
The term that describes the relationship in which one organism lives inside the other one is endosymbiosis.
Explanation:
In the rain forest, the thick foliage allows limited sunlight to filter through to the forest floor. Which wild cat species is best adapted to living in the rain forest?
Answers
Answer
D)Ocelot because they are medium sized cats that live in rain forests and grasslands.Ocelots appear to be better adapted to habitat disturbance and can live in disturbed forests. However, they can be found in a variety of habitats in Belize, from dry scrub to the dense forests.
EASY 28 POINTS
tolerance what does it mean to u why it it important own word plssss
Answers
Answer:
tolerance is the willingess to accept, and see value in the views of others
What is the purpose of the eyespot in a euglena?
Answers
Explanation:
eyespot, also called stigma, a heavily pigmented region in certain one-celled organisms that apparently functions in light reception. The term is also applied to certain light-sensitive cells in the epidermis (skin) of some invertebrate animals (e.g., worms, starfishes). Euglena anatomy.
The eye spot of euglena is to detect the intensity of light.
COMPONENTS OF EUGLENA:Euglena is a protist that possesses the characteristics of plant and animal. It is a unicellular and microscopic organism.
Euglena possesses certain structures that serve different purposes in the cell. They include:
GulletEye spot or stigmaChloroplastPellicleTherefore, the eye spot as a structure is used to detect the intensity of light.
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Which of the following shows an unsaturated fatty acid?
H
Н
о
•G
-сон
А.
H
NH
H
Н Н
н нннн
H
H
НА
Н
С
H
Hн Н
| | | |
СС-с
СС
І 11
H
N н нннн
О
C-C-C-C
| | |
н н н н н н Н
В.
H
он
с=0
он
CH2
о
С.
CH2
CH2
1
CH2
NH2
H
H
D. H— с
С
Н
Н
Н
Answers
Answer:
b
Explanation:
A bandage covers a wound preventing debris or bacterial from entering the healing tissues. Is the adhesive material used to stick the bandage to the skin designed tp be biotolerated or biocompatible
Answers
Yes, the adhesive material used to stick the bandage to the skin is designed to be biocompatible.
This means that it is made from materials that are not harmful to living tissue and will not cause an adverse reaction or irritation. This is important because the adhesive material is in direct contact with the skin and any adverse reactions could slow down the healing process. The biocompatible adhesive helps to ensure that the bandage stays in place while allowing the wound to heal properly without interference from external factors. These materials are chosen because they are inert, meaning that they do not react with the surrounding tissues and are unlikely to cause any adverse reactions.
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Besides building muscle tissue, protein functions includeGroup of answer choicesBuilding hormones and enzymesIncreasing immune functionAcid base balanceAll of the above
Answers
Beside building muscle tissue, protein functions include:
Building hormones and enzymes:
Both enzymes and hormones are proteins. The first help the different reactions that happen in the body by catalyzing them, affecting digestion, energy production and many other reactions. Hormones act as chemical messengers transmiting information between cells, tissues and organs.
Increasing immune function:
Proteins are involved in the production of immunoglobulins which are antibodies. These protect the body from bacteria and viruses.
Acid base balance:
They act as a buffer system because they help the body maintain the correct pH of the blood and other fluids.
Therefore the right answer is the last one: All of the above
The number of possible genetically different gametes for an organism equals 2n where n is the number of chromosomes.if an organism has four pairs of chromosomes how many diffrent gametes can it produce?
a.16
b.4
c.8
d.32
Answers
If a gamete contains four pairs of chromosomes, then there are eight alternative genotypes or genetic compositions that could exist.
The formula states that the number of genetically distinct gametes for an organism is equal to 2n, where n is the number of pairs of chromosomes. There are two equally likely configurations for the chromosomes inherited from the two parents to take during metaphase I in a diploid cell with four chromosomes (two homologous pairs). This difference in chromosome orientation results in gametes with four equally likely chromosome pairings. The total number of distinct gametes that can exist is 2n, where n is the sum of a set's chromosomes.
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Answer:
The Answer would be A. 16
Explanation:
have a nice day.
the fertilized egg cell begins to divide, and the dna of each new cell is an exact copy of the original cell. based on this information what type of cell division is responsible for blastocyst formation?
Answers
Answer:
mitosis
Explanation:
Based on the information, the type of cell division that is responsible for blastocyst formation is mitosis.
What do you mean by Cell division?Cell division may be defined as the process by which cells divide and increase in number to produce new cells.
After the fertilization of the egg cell, it divides through the process of rapid cell division known as cleavage to form blastocysts.
But the given process of cell division which involves the process of exact copying of DNA to each cell indicates the process of mitosis.
Therefore, based on the information, the type of cell division that is responsible for blastocyst formation is mitosis.
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What could a human living now and a horse living thousands of years ago
have in common?
A. They need the same amount of energy to survive.
ООО
B. They have the exact same DNA
C. They are made of some of the same matter.
D. They both get their energy directly from the sun
Answers
Answer:
they both get their energy directly from the sun
prenatally, development happens in a "head to tail" pattern known as:
Answers
Prenatally, development happens in a "head to tail" pattern known as "cephalocaudal development."
This means that development starts at the head and progresses downward toward the feet. During embryonic and fetal development, the head is the first part of the body to form and develop, and it is also the most complex part of the body.
As development progresses, the body and limbs gradually take shape and mature. This pattern of development is thought to be due to the fact that many critical organ systems and structures, such as the brain and spinal cord, are located in the head and upper body, and need to develop early in order for the rest of the body to function properly.
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