Why do lacI-d alleles have a dominant-negative effect?
What will be an ideal response?
Ans: The repressor protein is composed of four subunits. The lacI-d mutation creates a subunit that interferes with proper assembly of the tetramer. This will cause the repressor to be inactive even when normal subunits are available.
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The mutation shown in the figure involve a transformation of one structure into another structure. What are these types of mutations called?
A. homeotic mutations B. transversions C. synonymous mutations D. frameshift mutations E. Inversions
Full induction of the lactose operon requires
A. that lactose and arabinose both be present. B. that lactose and glucose both be present. C. that lactose be present without glucose. D. that lactose be present. E. All of these choices induce the lactose operon.
What is the only group of Mollusca that does NOT have a radula?
A) Bivalves B) Gastropods C) Chitons D) Cephalopods E) All mollusk have a radula.
Which of these is not found in RNA?
A) phosphate B) deoxyribose C) purines D) ribose