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lesya692 [45]
3 years ago
10

If the DNA molecule is only composed of four possible nitrogen bases, how can thousands of different proteins be formed from suc

h a limited set of fixed shapes?
Biology
1 answer:
Monica [59]3 years ago
7 0

Answer:

nucleotides are only building blocks whose combinations determine different codons which subsequently associate in a sequential manner in order to create different amino acid combinations

Explanation:

A gene is a specific segment of DNA whose (nucleotide) sequence is copied into an RNA during the process of transcription, typically a messenger RNA (mRNA) molecule which is subsequently used to synthesize a protein. During translation, each triplet of nucleotides, i.e., each codon, corresponds to a specific amino acid.  There are 64 possible codons (4³: 64), which can combine in different ways to create different amino acid combinations, and thus they are responsible for the generation of a huge amount of proteins coded by a given genome.

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3 years ago
The lac operon can be regulated by two distinct methods. Which of the following statements are correct?The lac operon can be act
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Explanation:

Lactose operon or lac operon  (includes lacZ, lacY and lacA genes) is found in some bacteria and the products of its genes are involved in lactose metabolism. So, this operon is active (genes are transcribed) when lactose is present and glucose is absent (or at low level). The operon is regulated by the lac repressor which acts as a lactose sensor and catabolite activator protein (CAP) which acts as a glucose sensor.

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