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Chapter 15: 5.question (page 391)

How many nucleotides are in 12 mRNA codons?

a. 12

b. 24

c. 36

d. 48

Short Answer

Expert verified

In each of the 12 codons of mRNA, there are 36 nucleotide bases.

Step by step solution

01

step-1: Introduction

A single-stranded RNA molecule called messenger RNA (mRNA) is complementary to one of a gene's DNA strands.

02

step-2: Explanation of correct answer

Option (c) 36 numbers. This is caused by genetic code degeneration. The degeneracy of genetic coding states that there are 64 codes of three nucleotides for every 20 amino acids. When a codon is a singlet (41=4), there are only four possible combinations of A,U,G, and C. It can make 16 distinct combinations (42)as a doublet, but it can produce 64 different combinations as a triplet (43), which is enough to encode for 20 amino acids. Because triplets comprise three nucleotides.

12脳3=36

there are a total of 36 nucleotides in 12 codons for 12 mRNA.

03

step-3: Explanation of incorrect answer

Option (a) 12 number. This number is not possible because the number of nucleotide asked is for 12mRNA only . We can get this number of nucleotides when 4mRNA is asked .
Option (b) 24.This number is not possible because number of nucleotide asked is for only12mRNA . We can get this number of nucleotides when8mRNA is asked.
Option (d) 48 numbers. This number is not possible because number of nucleotide asked is for only 12mRNA. We can get this number of nucleotides when 16mRNAis asked.

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Most popular questions from this chapter

Three different bacteria species have the following consensus sequences upstream of a conserved gene.

Table 15.2 Order the bacteria from most to least efficient initiation of gene transcription. a. A > B > C b. B > C > A c. C > B > A d. A > C > B

A scientist observes that a cell has an RNA polymerase deficiency that prevents it from making proteins. Describe three additional observations that would together support the conclusion that a defect in RNA polymerase I activity, and not problems with the other polymerases, causes the defect ?

A scientist introduces a mutation that makes the 60S ribosomal subunit nonfunctional in a human cell line. What would be the predicted effect on translation?

a. Translation stalls after the initiation AUG codon is identified.

b. The ribosome cannot catalyze the formation of peptide bonds between the tRNAs in the A and P sites.

c. The ribosome cannot interact with mRNAs.

d. tRNAs cannot exit the E site of the ribosome.

A scientist sequencing mRNA identifies the following strand: CUAUGUGUCGUAACAGCCGAUGACCCG What is the sequence of the amino acid chain this mRNA makes when it is translated

Imagine if there were 200 commonly occurring amino acids instead of 20. Given what you know about the genetic code, what would be the shortest possible codon length? Explain.
See all solutions

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