Plasma cells
A. suppress immune reactions.
B. function in allergic reactions.
C. directly destroy target cells.
D. activate B-cells and other T-cells.
E. secrete antibodies.
Answer: E
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An insertion sequence is distinguishable from other mobile genetic elements because
A. it encodes a transposase. B. it is composed of DNA. C. it is highly complex. D. it is smallest.
Nitrogen is an essential nutrient for optimal plant growth because it is used to build
A. DNA. B. protein. C. mitochondria. D. nucleic acids. E. All of these are correct.
In what way does the green alga Ulva resemble land plants?
A) It produces diploid gametes. B) It has a complex life cycle with diploid body cells and haploid gametes. C) It has a complex life cycle with alternation between multicellular diploid and haploid generations. D) It has a multicellular haploid stage that alternates with a unicellular diploid stage.
The tropics are a region where air
A) descends and warms, dropping rain. B) descends and warms, creating an arid belt. C) rises and cools, creating an arid belt. D) rises and cools, dropping rain.