Figure 41.6
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Use the figure above showing cyclic events in a human ovary to answer the following question.
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Ovulation is indicated by the letter ____.
A. A
B. B
C. C
D. D
E. E
Answer: D
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Pine seedlings grown in sterile potting soil grow much slower than seedlings grown in soil from the area where the seeds were collected. This is most likely because _____
A) sterilized soil kills the root hairs as they emerge from the seedling B) the normal symbiotic fungi are not present in the sterilized soil C) sterilization removes essential nutrients from the soil D) water and mineral uptake is slower when mycorrhizae are present
All of the following are reasons for utilizing algae for biofuel production EXCEPT
A) they do not take up land needed for food production. B) they produce more energy per acre than corn. C) their main requirement is abundant light. D) they can utilize agriculturally poor land. E) they produce a nondegradable waste product.
Which of the following LEAST belongs with the others?
A. thymine dimer B. UvrA protein C. direct repair D. nucleotide excision repair E. UvrC protein
Descendant cells that are long-lived and "remember" a particular invader and mount a rapid intense response to it if it should reappear are ________
A) macrophages B) memory cells C) suppressor cells D) helper cells