Question

1. What would happen to a gene if the stop codon (UAA, UAG, or UGA) were mitated so that the first position in the codon became a “C” (CAA, CAG, CGA)?

a) the protein product of the gene would be similar than normal

b) either the immature RNA transcript or the mRNA will be degraded by nonsense mediated RNA decay

c) its mature messenger RNA would be lengthened

d) its immature RNA would be lengthened

2. Without a promoter region, a gene will ________________

a) be deleted from the genome

b) be over-expresses

c) will lack cell type-specific expression

d) not expressed

e) will contain a shorter RNA

3. Why would a gene have several different promoters?

a) this gene might be utilized for difference processes within a cell

b) to increase its expression level

c) it is necessary for a gene to have more than one promoter in order to be expressed

d) to decrease its expression level

Answer 1

Answer :

1 = d. It's immature RNA would be lengthened

Explanation : Protein produt of the gene will not similar because nucleotides are changed. Thereafter Transcription will continue still any other stop codon is not found. Therefore a immature mRNA will be produce which length will be more than older one.

2 = d. Not expressed

Explanation : ​Promoter is a region of gene that leads to initiation of transcription of a particular gene without promoter site Transcription will not occurre. so gene will not be express.

3 = a. This gene might be utilized for different processes within a cell

Explanation : One gene produce many types of proteins. Every Promoter site make a different types of mRNA sequence which encode a differentt types proteins. Those proteins are utilized for different processes.