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Anarel [89]
3 years ago
9

A key point in Darwin’s explanation of evolution is that Group of answer choices1. the biological structures most likely inherit

ed are those that have become better suited to the environment through constant use. 2. mutations that occur are those that will help future generations fit into their environments. 3. any trait that confers even a small increase in the probability that its possessor will survive and reproduce will be strongly favored and will spread through the population. 4. genes change in order to help organisms cope with problems encountered within their environments.
Biology
1 answer:
zaharov [31]3 years ago
8 0

3. any trait that confers even a small increase in the probability that its possessor will survive and reproduce will be strongly favored and will spread through the population.

Explanation:

  • Natural selection is a nonrandom process by which biological traits become more or less common in a population as a function of the differential reproduction of their bearers of differences in the rate of survival.
  • Natural selection can act on any heritable phenotypic trait and operate among any entities that reproduce, show inheritance of their characteristics from one generation to the next, and vary in fitness.
  • Natural selection is the machine that drives evolution. It also explains adaptation.
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Resethelp 1. Structure describes the alpha-helices and beta-sheets that are formed by hydrogen bonding between backbone atoms lo
ss7ja [257]

1. Answer;

-secondary structure;

Explanation;

Protein secondary structure refers to regular, repeated patterns of folding of the protein backbone. The two most common folding patterns are the alpha helix and the beta sheet. In an alpha helix, the polypeptide backbone coils around an imaginary helix axis in clockwise direction. In the beta sheet secondary structure, the polypeptide backbone is nearly fully extended. The R-groups are alternately pointed above and then below the extended backbone.

2. Answer;

- Quaternary structure

Explanation;

-Many proteins are formed from more than one polypeptide chain. The Quaternary structure describes the way in which the different subunits are packed together to form the overall structure of the protein. For example, the human hemoglobin molecule shown below is made of four subunits.

3. Answer;

-Tertiary structure

Explanation;

Tertiary structure refers to the overall folding of the entire polypeptide chain into a specific 3D shape. The tertiary structure of enzymes is often a compact, globular shape.

The tertiary structure is the structure at which polypeptide chains become functional. At this level, every protein has a specific three-dimensional shape and presents functional groups on its outer surface, allowing it to interact with other molecules, and giving it its unique function.

4. Answer;

Primary structure

Explanation;

-It is the simplest level of protein structure and is simply a sequence of amino acids in a polypeptide chain. For example, the hormone insulin has two polypeptide chains, A and B. Each chain has its own set of amino acids, assembled in a particular order. For instance, the sequence of the A chain starts with glycine at the N-terminus and ends with asparagine at the C-terminus, and is different from the sequence of the B chain.

7 0
3 years ago
Identify one food chain in this ecosystem.
Oksanka [162]

Answer:

a tree because its a plant

7 0
3 years ago
Beavers are able to adapt to the changing conditions of all four seasons. Which of the following would threaten the survival of
ELEN [110]

Answer:

C

Explanation:

The question says that beavers are able to adapt to changin questions in each season, so we know that snow in winter, or heat in summer won't bother them. These types of variations in weather are what the beaver is used to. This would eliminate A (July is in summer, so the beavers would expect heat), B (December is in winter, so the beavers would expect freezing conditions), and D (January is in winter, so the beavers expect the snow). That leaves us with C. Fires are not a typical condition for a season- fires aren't expected every fall. Therefore, when there is a fire, beavers will not know what to do. Hope this helps, and feel free to ask me for more clarification!

6 0
3 years ago
Read 2 more answers
Always return the
Nady [450]

Answer:

When you are finished with the microscope, return the scanning lens (4X) to place.

Explanation:

8 0
2 years ago
Proteins may be classified according to their three-dimensional shapes. Determine whether the following examples and description
m_a_m_a [10]

Answer:

-often function as enzymes or transport proteins  ⇒ globular proteins

-peptide chains arranged in long strands, or fibers  ⇒ fibrous proteins

-peptide chains highly folded into spherical shapes  ⇒ globular proteins

-keratins  ⇒ fibrous proteins

-hemoglobin  ⇒ globular proteins

-water-soluble  ⇒ globular proteins

-collagens  ⇒ fibrous proteins

-insoluble in water  ⇒ fibrous proteins

-generally function in structure and support ⇒ fibrous proteins

Explanation:

<u>Fibrous proteins </u>are composed by large polypeptide chains which interact each other and form large structures. They have water insoluble and have structural and protection functions- they are components of cells and tissues. Examples are: collagen, fibronectin, keratin, elastin, actin.

<u>Globular proteins</u> have a spherical compact structure in which hydrophobic aminoacids are buried inside the structure and hydrophilic aminoacids (which can interact with water molecules) are exposed to the exterior medium. For this, they are water soluble. They have often transport and catalytic functions. For example: hemoglobin, mioglobin, albumin, enzymes in general.

7 0
3 years ago
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