The conclusion, "Mutation hypothesis notes that mutations causing premature senescence are selected against weakly," makes more sense if we consider that ________
A) many mutations that cause cell death are, in fact, highly deleterious
B) individuals carrying a mutation causing death before reproductive maturity would have a lifetime reproductive success rate of zero
C) mutations causing death after reproduction has begun are selected against less strongly
D) mutations in individual cells may cause cell death, but this does not affect the rest of the organism
C
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The following organisms can incorporate nitrogen directly from the atmosphere into their bodies:
What will be an ideal response?
________ could not be involved in gene flow.
A. Zygotes dispersed by ocean currents B. Hybridization between neighboring populations C. Gametes dispersed by ocean currents D. Disassortative mating within a population E. Wind-blown pollen
Which of the following statements about tunicates is incorrect?
A. Tunicates are sessile as adults. B. Tunicates are nonvertebrate chordates. C. Tunicate larvae can reproduce. D. Tunicates are all marine animals. E. Tunicate larvae are tadpole-like with all of the basic chordate characteristics.
Autoinhibition can reduce enzymatic activity by:
A. reducing the quantity of active enzyme in the cell. B. preventing self-assembly of oligomer. C. requiring a ligand for activity. D. requiring an auxiliary protein for activity. E. All of the choices given are true.