Deciduous trees in North America are dormant during winter months because ____
a. they receive no precipitation during winter
b. photosynthesis cannot occur during winter
c. this offers a way to survive the extended drought-like conditions
d. the cold temperatures would otherwise damage leaves and buds
e. they have no leaves during winter months
ANSWER: d
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When a stalled replication fork undergoes fork regression the next step:
A. can be repair of the lesion because it has become double-stranded again. B. can be degradation of the displaced strands followed by branch migration and continued replication. C. can be translesion synthesis to bypass the lesion. D. can be synthesis-dependent strand annealing (SDSA). E. All of the choices given are possible outcomes.
When gibberellin binds to its receptor, what happens to activate the gibberellin-dependent transcription factor GA-TRXN?
A. Ethylene is released. B. A ubiquitin tag is used to degrade the GA-TRXN inhibitor. C. A DELLA protein is degraded, freeing the GA-TRXN. D. A DELLA protein is attached to GA-TRXN to activate it. E. The gibberellin is transferred to an alternate binding site.
The Hardy-Weinberg law is useful for
A. determining the extent to which a sexually reproducing population is evolving. B. predicting when genetic drift will occur in a sexually reproducing population. C. determining when speciation will occur. D. predicting when specific groups of organisms will become extinct. E. determining if a patient has a genetic disease.
What is the total magnification of a specimen viewed with a 10x ocular lens and a 45x objective lens?
A) 4.5x B) 10x C) 45x D) 100x E) 450x