How many different RNA sequences specify the amino acid histidine? . How many di

Question

How many different RNA sequences specify the amino acid histidine? . How many different RNA sequences specify the amino acid valine? . What amino acid does the RNA sequence AAA specify? . Indicate whether or not each of the following base pair substitutions would lead to a change in amino acid sequence by writing either Yes or No in the spaces provided. (Hint: Keep in mind that these base pair substitutions are changes in the DNA sequence). a. b. c.- d. e. AAA to AAG AAA to AAC TGT to TGC TGT to TGA TGT to GGT TGT to TTT

Explanation / Answer

Answer:

Answering first four questions:

1) How many different RNA sequences specify the amino acid histidine:

Answer: 2 RNA triplet codon CAU and CAC specify histidine.

2) How many different RNA sequences specify the amino acid valine.

Answer: 4 RNA triplet codon GUU, GUC, GUA and GUG specify valine.

3) What amino acid does the RNA sequence AAA specify?

Answer: AAA RNA triplet codon specify Lysine

4) Indicate whether or not each of the following base pair substitutions would lead to a change in the amino acid sequence.

a) AAA to AAG (RNA: UUU to UUC) - No both codes for Phenylalanine

b) AAA to AAC (RNA: UUU to UUG) - Yes Phenylalanine to Leucine

c) TGT to TGC (RNA: ACA to ACG) - No both codes for Threonine

d) TGT to TGA (RNA: ACA to ACU) - No both codes for Threonine

e) TGT to GGT (RNA: ACA to CCA) - Yes Threonine to Proline

f) TGT to TTT (RNA: ACA to AAA) - Yes Threonine to Lysine

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