Globin chain switching replaces gamma chains with ________ chains in adult hemoglobin.
A) epsilon
B) zeta
C) beta
D) alpha
C) beta
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Why don't plant cells use a contractile ring to divide their daughter cells?
A. Plant cells don't have an actin cytoskeleton. B. Plant cells don't form daughter cells. C. A contractile ring can't "pinch" a cell wall. D. Plant cells don't have plasma membranes.
Natural selection acts only on traits that are _____.
A. advantageous in a certain environment B. disadvantageous C. advantageous D. heritable
The primary nitrogenous waste product of aquatic organisms is ________
Fill in the blank(s) with correct word
Which of the following is false about the E. coli Lac operon?
A. it is an example of negative control B. the presence of lactose acts as an inducer C. the repressor binds to the operator D. the mRNA for the receptor binds to the operator