Which one of the following is true about the genetic code? Question 1 options: I

Question

Which one of the following is true about the genetic code?

Question 1 options:

It is absolutely identical in all living things.

Several different codons may encode the same amino acid.

The base in the middle position of the tRNA anticodon sometimes permits "wobble" base pairing with 2 or 3 different codons.

All codons recognized by a given tRNA encode different amino acids.

The first position of the tRNA anticodon is always adenosine.

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Question 2 (1 point)

How many amino acids are there in the standard genetic code?

Question 2 options:

3

20

64

16

4

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Question 3 (1 point)

Which of these polymerases does not require a template?

Question 3 options:

DNA Polymerase

Reverse transcriptase

Polynucleotide Phosphorylase

RNA pol I

RNA pol II

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It is absolutely identical in all living things.

Several different codons may encode the same amino acid.

The base in the middle position of the tRNA anticodon sometimes permits "wobble" base pairing with 2 or 3 different codons.

All codons recognized by a given tRNA encode different amino acids.

The first position of the tRNA anticodon is always adenosine.

Explanation / Answer

1. B) Several different codons may encode the same amino acid.

This property of the genetic code is called being degenerate. This implies that there are some amino acids that are encoded by more than one codon. This is evident by the fact that there are only 20 amino acids and 64 codons.

2. B) 20

There are 20 amino acids.

3. C) polynucleotide phosphorylase

This is one of the bifunctional enzymes which works by dismantling the RNA chain at the 3’ end and works towards the 5’ end.

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