Question

In the gene TATTCATTGTTA—TGATTT—ATTCG, CATTGTTA encodes for pepsin, a digestive enzyme. The rest of the sequence doesn’t code for any protein. Which sequence contains a mutation that will affect the formation of pepsin?
A.
TATTCATTCATTA—TGATTT—ATTCG
B.
TATTCATTGTTA—TGACTTT—ATTCG
C.
TATTCATTGTTA—TGATTT—ATTGGCG
D.
TATTCATTGTTA—TGAT—ATTCG
E.
TGCATTCATTGTTA—TGATTT—ATTCG

Answer 1

Answer:

A.      TATTCATTCATTA—TGATTT—ATTCG

Explanation:

TATTCATTGTTA—TGATTT—ATTCG

The bold and underlined part is the only part of the sequence that codes for pepsin. Therefore, only mutations in this area will affect the formation of the protein.

The only sequence where the "CATTGTTA" part of the sequence is affected is option A.

Answer 2

Answer: A.  TATTCATTCATTA—TGATTT—ATTCG

Explanation: CATTGTTA - CATTCATTA