Question

A small portion of an mRNA sequence is shown below.

AAUGACUGGCUC
Starting with the first base, how many codons does this portion of the sequence contain?
A. 1
B. 4
C. 6
D. 12

Answer 1

1 amino acid equals 3 codons

AAU= 3 codons
GACUGGCUC=9 codons
Each letter counts as one codon. There fore, there are 12 codons, resulting in answer D.

Answer 2

Option B, 4

Step-by-step explanation:

There are four nucleotides in DNA/RNA namely

a) A - Adenine

b) C – Cytosine

c) G – Guanine

d) T – thymine in DNA and U – Uracil in RNA

When these nucleotides group themselves in pair of three they are called codons.

In the given small portion of an mRNA sequence,

AAUGACUGGCUC there are total 4 codons namely

AAU

GAC

UGG

CUC

Hence, option B is correct.