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3 years ago

How many of the following factors would affect the permeability of the cell membrane?

Biology

1 answer:

Reil [10]3 years ago

4 0

3 of the factors: A,B, and C

A Size of molecules (this one)

B Lipid solubility of molecules (this one)

C Presence of transport channels (this one)

D Presence of ATP inside the cell (this is the only one that would not affect it)

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If an adult dog has 78 chromosomes the number of chromosomes in a dogs sperm cell will be

Sergio039 [100]

Reproductive cells are haploid (have 1/2 the chromosomes), whereas somatic/body cells are diploid (have the full set of chromosomes)

This makes sense if you think about it. Using the example from the question, every dog has 78 chromosomes. This includes two of each (there are two chromosome 1's, two chromosome 2's, etc. This is visible in the karyotype attached). One set of these chromosomes were inherited from the mother, and one set from the father. Each parent contributed 39 chromosomes (one chromosome 1, one chromosome 2, etc.). If the dog in the question were to have 78 chromosomes in its sperm cells, it would contribute two sets to its offspring. When combined with the chromosomes in the egg cell, the offspring would end up with extra chromosomes. Therefore, both the sperm and the egg cells will have 39 chromosomes, one of each. When combined, they will produce offspring with 78 chromosomes, the proper number.

5 0

2 years ago

Read 2 more answers

Each category represents one of the functions of proteins. Match each example with the appropriate function.

geniusboy [140]

Answer:

1. Providing structure --> Collagen makes skin strong yet flexible.

2. Maintaining homeostasis --> Insulin controls the concentration of sugar in the blood.

3. Fighting Disease --> IgA prevents the buildup of viruses and bacteria in the gut.

4. regulating chemical reactions --> Pepsin works in the stomach to speed up the breakdown of food.

5 0

2 years ago

Briefly outline the steps involved in glycogen synthesis and breakdown and explain the regulatory mechanism involved in glycogen

Elenna [48]

Answer:

Glycogen is synthesized and degraded by different pathways, which provide greater flexibility for energy production through its degradation or for storage in its synthesis and thus maintain control of both metabolic pathways.

Explanation:

Synthesis and degradation pathways:

1º.- activation of glucose units at UDP-glucose.

UDP-glucose is an activated form of glucose, which is formed in a reaction catalyzed by UDP-glucose, which is formed in a reaction catalyzed by UDP-glucose pyrophosphorylase. This reaction is an example of biosynthetic reactions that are directed by the hydrolysis of pyrophosphate (PPi-2Pi).

Many biosynthetic reactions are directed by the hydrolysis of pyrophosphate, which catalyzes pyrophosphate hydrolase or pyrophosphatase, and is very favorable thermodynamically.

2nd.- polymerization or addition of glucose units to glycogen. Two steps: addition and branching.

UDP-glucose acts as the giver of glucose units for glycogen synthesis. Glucose transfer

from the UDP-glucose to a growing glycogen chain is catalyzed by glycogen synthase.

A branching enzyme [amyl (1,4 -> 1,6) -transglucosidase], moves a chain of about seven glucose residues, to form

bonds (α1-> 6) at the branching points.

To start glycogen synthesis, glycogen synthase is only effective when it is linked to glycogenin. Glycogenin is

an oligosaccharide carrier protein formed by glucose units with linkages (α1-> 4).

6 0

3 years ago

Which term is used to define substances that participate in chemical reactions?

Ilia_Sergeevich [38]

These substances are called reactants.

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3 years ago

Explain why natural selection does not operate on characteristics which affect fitness

MaRussiya [10]

It does in fact that's really what natural selection is all about it uses the characteristics that would better help the organism survive therefore making the species thrive

6 0

2 years ago