according to mendel's law of segregation, what is the probablity that a gamete (egg or sperm) from an rr parent carries an r allele?

Answer:

A cell is the smallest unit of a living organism

Explanation:

Just as an atom is described as the smallest unit if any substance, a cell is defined as the smallest, basic unit of any living organism.

This means that in order for something to be considered an organism, it has to contain, at least, a cell. Such organism with a single cell is referred to as a unicellular organism.

There are several organisms with more than one cell. Such organisms are said to be multicellular. Multicellular organisms often have their cells organized into tissues, organs, and or systems in order to function efficiently and maximally.

Cells can be of different types based on their level of complexity. The simple cells that do not have nucleus nor membrane-bound organelles are referred to as prokaryotic cells while the ones with complex structures with a nucleus and membrane-bound organelles are known as eukaryotic cells.

Answer:

RNA contains Uracil

Explanation:

DNA's four bases are: Adenine, Thymine, Cytosine, and Guanine.

RNA replaces the Thymine with Uracil, making it the correct choice.

If I helped, a brainliest answer would be greatly appreciated!

Answer:

The answer is 1 atom of Nitrogen and 3 atoms of Hydrogen

Explanation:

nitrogen gas+ Hydrogen =ammonia

N+H3----->NH3

Answer:

c) they were killed when the ice caps melted and water covered the land

Explanation:

mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.

Answer:

D

since the theory of an astroid or volcano bursting caused the enjoinment to become dark and cold. Many animals did not survive this drastic change in their environment and many things died.

Explanation:

True. Smoking diminishes ciliary action and eventually destroys the cilia. Cilia are hair-like structures that line the respiratory tract and help to move mucus and foreign particles out of the lungs.

Smoking causes damage to the cilia, reducing their ability to function properly and increasing the risk of respiratory infections and other lung problems. Over time, smoking can lead to the destruction of cilia, further impairing the body's ability to clear mucus and harmful substances from the lungs. This can contribute to the development of chronic bronchitis, emphysema, and other respiratory diseases.

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Answer:

b

Explanation:

........

Hardwired characteristics of the brain that attempt to keep us in balance by correcting deficiencies are referred to as homeostatic mechanisms.

Homeostasis is the body's ability to maintain a stable internal environment despite external changes.

In the context of the brain, homeostatic mechanisms involve various processes that regulate physiological functions and maintain optimal levels of essential substances.

These mechanisms can include feedback loops that detect imbalances and initiate corrective actions.

For example, if there is a deficiency in a particular nutrient or hormone, the brain may activate mechanisms to increase its production, decrease its consumption, or enhance its absorption from the environment.

Homeostatic mechanisms play a crucial role in ensuring the body's overall stability and functioning, helping to maintain proper levels of various substances and promoting overall well-being.

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Answer:

B) Photosynthesis by the phytoplankton increases the oxygen concentration of the ocean.

C) Decomposition of dead organic matter decreases the oxygen concentration in the ocean.

Explanation:

The ocean's carbon dioxide and oxygen levels change due to biological processes. Phytoplankton, through photosynthesis, increase the oxygen concentration in the ocean. However, the decomposition of dead organic matter decreases the oxygen concentration as it consumes oxygen in the process.

The correct option is the fourth one, Liquid. Protist are unicellular organisms adapted to swimming. Therefore it is essential for them enough water to mobilize, but also to keep hydrated.

Answer:

true

Explanation:

Rock Salt Kosher Salt.

In the given statements, it can be inferred that plasmids contain the lacZ gene, and colonies that are white indicate the presence of a plasmid and the expression of the lacZ gene.

In the first statement, it is correct that colonies that are white contain a plasmid and are expressing the lacZ gene. This is because the lacZ gene produces β-galactosidase, which can convert a substrate called X-gal (5-bromo-4-chloro-3-indolyl-β-D-galactopyranoside) into a blue compound.

The second statement is incorrect. Colonies that are white do not necessarily have a non-functional lacZ gene due to DNA insertion. The absence of β-galactosidase activity, resulting in white colonies, can also be due to factors such as mutations in the lacZ gene or the presence of inhibitory substances in the growth medium.

The third statement is partially correct. Plasmids commonly contain an ampicillin resistance gene, which confers resistance to the antibiotic ampicillin. This allows bacteria harboring the plasmid to grow and form colonies on media containing ampicillin.

In summary, the plasmids contain the lacZ gene, and colonies that are white indicate the presence of a plasmid. However, the white color alone does not necessarily indicate a non-functional lacZ gene due to DNA insertion.

Furthermore, plasmids commonly contain an ampicillin resistance gene, which allows bacteria to grow on media containing ampicillin, but this is unrelated to the white color of the colonies.

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Answer:

B. Cannabinoids are the only substances in mammals’ milk that stimulate the  appetite.

Explanation:

Note, in logical reasoning, an argument is often based on a particular premise or assumption.

Since we are told the injected mice showed far less interest in feeding than normal newborn mice do after been injected with a chemical known to block cannabinoids, the best assumption that supports this result is that cannabinoids are the only substances in mammals’ milk that stimulates appetite.

In other words, no other substance can result in a lack of or reduced appetite in mammals since the researchers were only concerned with a chemical that blocks cannabinoids from reaching their receptors in the brain so as to prevent stimulation of appetite.

A. A deletion in region 2, band 5 in the long arm of chromosome 4For this given scenario, the proper notation will be del(4)(q25). The del in the notation stands for the deletion of the chromosome.

B. Paracentric inversion(with two breaks in the same arm) in the long arm of chromosome 6, region 1, with break points in bands 2 and 6The proper notation for the given scenario will be Inv(6)(q12q26). Inversion is represented by Inv in the notation.

C. Translocation of the long arm of chromosome 14 with the retention of the chromosome 14 centromere. Assume a break in the short arm of chromosome 14 at region 1 band 1 and the loss of the entire short arm of 21

The proper notation for the given scenario will be t(14;21)(q11;q22).

Translocation is represented by t in the notation. The chromosome resulting from this translocation is properly referred to as a translocated chromosome.

D. A pericentric inversion in chromosome 2 with break points in region 1, band 4 of the short arm and region 2, band 3 of the long armThe proper notation for the given scenario will be Inv(2)(p14q23).

Inversion is represented by Inv in the notation.

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(a) The group of insects contains the greatest number of different species.

(b) The scientific name of seven-spot ladybird is Coccinella septempunctata.  

Insects are the group of animal kingdom that contains the greatest number of species. These are the invertebrates that fall within the phylum Arthropoda. Insects usually have a chitinous exoskeleton. Their body is divided into three parts: head, thorax and abdomen.

Coccinella septempunctata is most commonly found in Europe. The ladybird usually feeds on aphids. It has bright red colored exoskeleton and has a foul taste when eaten by the predators. It is known to synthesize a toxic alkaloid.

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The food chain  for the ecosystem is;

primary producer  -------> herbivore  -------> Decomposer -----> Algae

The term food chain has to do with the movement of energy across the ecosystem. Let us recall that the ecosystem is a self sustaining unit in which there is an exchange of materials and energy. This implies that there must be a transfer of energy between the living and the non living parts of the ecosystem. The living parts of the ecosystem are the plants and the animals while the non living parts of the ecosystem are the climatic and the edaphic factors in the ecosystem.

Having said this, we are now to fil in the food chain. The food chain shows the relationship between the organisms in an ecosystem. It then follows that there is a 10% drop in energy as it is passed on from one trophic level to the next.

The food chain therefore is;

primary producer  -------> herbivore  -------> Decomposer -----> Algae

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DNA replication process is the event during which the molecule duplicates. It occurs in the interphase and involved different enzymes, a DNA molecule, and free nucleotides. Image attached.

DNA replication is the process through which DNI molecule duplicates. This event takes place during the S stage of the interphase. So when the cell divides during mitosis or meiosis, each cell will get a complete set of chromosomes.

DNI replication is semi-conservative because each new molecule carries an original DNI strand and a new one. The fact that the new molecule is composed of an original strand makes it semi-conservative. The old existing strands are used to synthesize the new complementary strand.

The origin of the replication requires helicase enzymes to break hydrogen bonds and separate the two original strands. The topoisomerase enzyme is necessary to release tension. Other proteins are also needed to join the strains and keep them separated.

Once the molecule is opened, there is a region named replication forks. DNA polymerase makes the new nucleotides enter into the fork and pairs them with the corresponding nucleotide of the original strand. Adenine pairs timine, and cytosine pairs guanine.

DNA strands are antiparallel, and replication occurs only in 5'-3' direction. So one of the strands will replicate continuously, while the other strain will be formed by short fragments known as Okazaki fragments.

Primers are needed to make the DNA polymerase work. Primers are small units of RNA and are placed at the beginning of each new fragment.

You will find the labelled Image in the attached files.

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Answer:

An active transport is the movement, requiring energy, of ions or molecules across a membrane into a region of higher concentration.

Memory technique:

To help you remember the difference between active and passive energy, think of being active, like playing football or jumping rope. All these things require energy, just like an active transport. Passive transport does NOT require energy.

The main difference between anaphase 1 and 2 is that homologous chromosomes are segregated during anaphase 1, while sister chromatids are separated during anaphase 2.

Phase of mitosis that occurs between prophase and anaphase, with a shorter duration than prophase. Chromosomes reach maximum shortening during metaphase. The mitotic spindle is formed, with some fibers that go from pole to pole and others that are attached to the chromosomes by the centromeres.

Anaphase is the phase in which the sister chromatids of the duplicated chromosomes are pulled apart, pulled through the shortening of the microtubules that are attached to the kinetochores, and the degradation of the tubulin molecules that hold the sister chromatids together.

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Answer:

The axial filament is located between the cell membrane and the outer membrane. ... Flagella can rotate 360 degrees.

Explanation:

I found the answer on quizlett

Answer:

Molar masses:

Nitrogen gas (N2): 28.02 g/mol

Hydrogen gas (H2): 2.02 g/mol

Ammonia (NH3): 17.03 g/mol

The number of moles of N2 and H2 are:

N2: 10.0 g / 28.02 g/mol = 0.357 moles

H2: 10.0 g / 2.02 g/mol = 4.95 moles

Since 3 moles of H2 are required for every mole of N2, H2 is the limiting reactant and N2 is the excess reactant.

The amount of ammonia produced can be calculated using the limiting reactant:

0.357 moles N2 * 2 moles NH3/1 mole N2 = 0.714 moles NH3

0.714 moles NH3 * 17.03 g/mol = 12.28 g NH3.

Therefore, 10.0 grams of nitrogen gas reacts with 10.0 grams of hydrogen gas to produce 12.28 grams of ammonia.

Explanation:

A. milk is my answer

Meiosis does not occur in archaea or bacteria, which reproduce via asexual processes such as mitosis or binary fission. ... Because the chromosomes of each parent undergo genetic recombination during meiosis, each gamete, and thus each zygote, will have a unique genetic blueprint encoded in its DNA.

Inhibitors are molecules that decrease enzyme activity and can be classified based on their mode of action. Competitive inhibitors compete with the substrate for binding to the active site, while non-competitive inhibitors bind at other sites.

Here are the statements that are true of an inhibitor that binds the active site of an enzyme:These inhibitors compete with the substrate for the active site of the enzyme. Adding more substrate can reduce the effect of these inhibitors.

These inhibitors are structurally similar to the normal substrate of an enzyme.Inhibitors that bind the active site of an enzyme act as competitive inhibitors. These molecules are structurally similar to the substrate and can bind to the enzyme's active site.

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Answer:

The organism would not grow.

If an organism were cut or burned, the damaged area would not heal.

The organism would not produce new cells.

Explanation:

Just did it on edge, June 17th 2022

Answer: Salt is an ionic compound, consisting of a crystal, lattice structure of the two ions Na+ and Cl-. Salt water is full of sodium chloride molecules.

Explanation:

hope this helps

Answer:

Chemically, table salt consists of two elements, sodium (Na) and chloride (Cl). Neither element occurs separately and free in nature, but are found bound together as the compound sodium chloride.

Answer:

True.

Explanation:

Its true because the machine needs an effort to overcome a load (simple machine)

Statement regarding mRNA that is false : c.)it is always monocistronic

Eukaryotic mRNAs are not always monocistronic, meaning that they each encode only a single polypeptide. Prokaryotic mRNAs of bacteria and archaea are commonly polycistronic implying  that they encode multiple polypeptides

mRNA carries genetic information from DNA to ribosomes and ribosomes are the site for synthesis of protein . The process of translation occurs in ribosomes. Genetic information is all of the information stored in our DNA which stands for “deoxyribonucleic acid" and  it looks like a twisted ladder, known as a double helix.

Transcription is the process by which the information in a strand of DNA is copied into mRNA.

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Answer:

D

the answer is D brother

The statement that is not true of proteins is: 2) Plant proteins are complete proteins.

Plant proteins are generally considered incomplete proteins because they lack one or more essential amino acids required by the human body. Complete proteins contain all the essential amino acids in sufficient amounts to support optimal protein synthesis and meet the body's needs.

To clarify the other options:

High temperature can denature proteins: This statement is true. High temperatures can disrupt the protein's structure, leading to denaturation and loss of its biological activity.

A protein molecule has amino acids connected by peptide bonds: This statement is true. Proteins are composed of amino acids linked together by peptide bonds to form a linear chain, known as a polypeptide chain.

All proteins contain C, H, N, and O: This statement is true. Carbon (C), hydrogen (H), nitrogen (N), and oxygen (O) are the four essential elements found in proteins. These elements are present in amino acids, which are the building blocks of proteins.

Therefore, the statement that is not true is the second option, which suggests that plant proteins are complete proteins. In reality, plant proteins often lack one or more essential amino acids and are considered incomplete proteins.

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