Why is it possible for an amino acid to be called for by more than one codon ?

1 answer:

4 0

There are 20 amino acids and 64 codon combinations that make up an amino acid, therefore some amino acid combinations result in the same amino acid.

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Carbon is released as __________ during respiration.

Nezavi [6.7K]

Carbon is released as carbon dioxide during respiration.

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Based on what you know about natural selection, which of the following must be true if evolution is the explanation for what the

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The Grants's research shows that variation within species increases the likelihood of the species' adapting to and surviving the environmental change.

Explanation:

The beaks of individual birds can change depending on what food is available.

Over time, individuals can evolve to better fit the environment by changing heritable traits.

Beak depth and length must affect survival and/or reproduction of birds.

Beak depth and length must be heritable.

Beak depth and length must show variation among individuals of a single species.

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Which of the following is NOT one of the strata in the Gilbert-Kahl Model of the

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This is not biology

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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their e

cricket20 [7]

Answer:

The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.

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3 years ago

When does fetal erythrocyte production shift from the liver to the bone marrow?

vichka [17]

Answer: After seven months.

Explanation:

The blood carries various substances that must be transported from one part of the body to another. Red blood cells are an important component of the blood because their function is to carry oxygen to the body tissues and exchange it for carbon dioxide, which is carried and removed by the lungs.

Erythropoiesis is the process of red blood cell (erythrocyte) production. It is stimulated by a decrease in O2 in the circulation, detected by the kidneys, which then secretes the hormone erythropoietin. This hormone stimulates the proliferation and differentiation of red blood cell precursors, which triggers an increase in erythropoiesis in hematopoietic tissues and ultimately in the production of red blood cells. <u>In adults, red blood cells are formed in the red bone marrow.</u>

In early developing fetuses, erythropoiesis occurs in the mesodermal cells of the yolk sac. In the third or fourth month, erythropoiesis moves to the liver. After seven months, erythropoiesis occurs in the bone marrow.

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3 years ago