Question 21.8: An mRNA has the sequence of codons 5' CCC AGA GCC 3'. If a p...

General, Organic, and Biological Chemistry: Structures of Life

An mRNA has the sequence of codons 5′ CCC AGA GCC 3′. If a point mutation in the DNA changes the mRNA codon of AGA to GGA, how is the amino acid sequence affected in the resulting protein?

The blue check mark means that this solution has been answered and checked by an expert. This guarantees that the final answer is accurate.
Learn more on how we answer questions.

The mRNA sequence 5′ CCC AGA GCC 3′ codes for the following amino acids: proline, arginine, and alanine. When the point mutation occurs, the new sequence of the mRNA codons is 5′ CCC GGA GCC 3′,which codes for proline, glycine, and alanine. The polar basic amino acid arginine is replaced by the nonpolar amino acid glycine.

	Normal	After Point Mutation
mRNA codons	5′ $\boxed{CCC} \boxed{AGA} \boxed{GCC}$ 3′	5′ $\boxed{CCC} \boxed{GGA} \boxed{GCC}$ 3′
Amino acid sequence	$\boxed{Pro} — \boxed{Arg} — \boxed{Ala}$	$\boxed{Pro} — \boxed{Gly} — \boxed{Ala}$

Related Answered Questions

Question: 21.7

Use three-letter and one-letter abbreviations to write the amino acid sequence for the peptide from the mRNA sequence of 5′ UCA AAA GCC CUU 3′. ...

Verified Answer:

Each of the codons specifies a particular amino ac...

Question: 21.9

Why are viruses unable to replicate on their own? ...

Verified Answer:

Viruses contain only packets of DNA or RNA, but no...

Question: 21.6

a. In eukaryotic cells, what must happen before transcription can begin? b. What does an activator do to increase the level of transcription of a gene in a eukaryotic cell? ...

Verified Answer:

a. A series of transcription factors must bind to...

Question: 21.5

The sequence of bases in a part of the DNA template strand is 3′ C G A T C A 5′. What corresponding mRNA is produced? ...

Verified Answer:

To form the mRNA, the bases in the DNA template ar...

Question: 21.4

In an original DNA strand, a segment has the base sequence 5′ A G T C C G 3′ . a. What is the sequence of nucleotides in the daughter DNA strand that is complementary to this segment? b. Why would the complementary sequence in the daughter DNA strand be synthesized as Okazaki fragments that require ...

Verified Answer:

a. Only one possible nucleotide can pair w ith ea...

Question: 21.3

Write the complementary base sequence for the following segment of a strand of DNA: 5′ A C G A T C T 3′ ...

Verified Answer:

The complementary base pairs are AT and GC. The co...

Question: 21.2

Draw the condensed structural formula for an RNA dinucleotide formed by joining the 3′ OH group of adenosine monophosphate and the 5′ phosphate group of cytidine monophosphate. ...

Verified Answer:

The di nucleotide is drawn by connecting the 3' hy...

Question: 21.1

For each of the following nucleotides, identify the components and whether the nucleotide is found in DNA only, RNA only, or both DNA and RNA: a. deoxyguanosine monophosphate (dGMP) b. adenosine monophosphate (AMP) ...

Verified Answer:

a. This nucleotide of deoxyribose, guanine, and a...