The Use of Proflavin-Induced Mutations (Like FCO)in the RII Genome

question 18

Multiple Choice

The use of proflavin-induced mutations (like FCO) in the rII genome was found to experimentally support a three-nucleotide explanation for the genetic code because:

• A)an insertion mutation could be suppressed by a deletion mutation.
• B)the rII genes are easier to mutate than other genes.
• C)proflavin was an inexpensive mutagenic compound.
• D)a gene with three insertions or three deletions could sometimes provide a functional protein.
• E)the rII gene encoded a protein with exactly the correct number of amino acids,as would be explained by a three nucleotide genetic code.

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Definitions:

Cremaster Muscle

A muscle that covers the testis and spermatic cord, involved in the reflex action of moving the testis closer to the body in response to cold or fear.

Vas Deferens

The duct that conveys sperm from the testicle to the urethra.

Spermatic Cord

A bundle of fibers and tissues in males that includes the vas deferens, blood vessels, nerves, and the cremaster muscle, responsible for supporting the testes.

Inguinal Canal

A passage in the lower anterior abdominal wall which in men, contains the spermatic cord and in women, the round ligament of uterus.