Quiz #4 Answers

correct answers in bold

#1 (5 points) How can the abundance and function of a gene’s products (RNA, protein) be regulated inside the cell?

A. At the level of transcription, synthesis of a RNA molecule from coding DNA

B. At the level of translation, synthesis of a protein product from a template mRNA

C. RNA stability and structure, post-transcriptional regulation of RNA

D. All of the above

#2 (5 points) You have a lacIS (‘super repressor’) mutant of coli. The LacI protein of this mutant cannot bind lactose, but can bind the operator. The lac operon structural genes (lacZ, lacY, lacA) will be expressed:

A. Only when there is lactose in the growth media.

B. Only when there is not lactose in the growth media

C. Always, regardless of whether or not there is lactose in the growth media

D. Never, regardless of whether or not there is lactose in the growth media


#3 (5 points) You are a population geneticist studying a diploid species of salamander. The gene B influences salamander coloration. Two alleles of this gene exist, allele B (dominant) results in yellow salamanders, allele b (recessive) results in brown salamanders. The frequency of allele B is 0.07. What is the frequency of the b allele?

A. 0.93

B. 0.14

C. 0.07

D. 0.01


#4. (5 points) In which of the following populations is genetic drift expected to be strongest, in terms of its effects on change in allele frequencies over time?


A. 10,000 rabbits

B. 1,000 rabbits

C. 100 rabbits

D. 10 rabbits

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