Cytotoxic T cells produce ____
a. cytokines
b. antibodies
c. plasma cells
d. chemicals that cause apoptosis
e. histamine
ANSWER: d
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________ RNA is a component of the ribosomes that serve as the site of protein synthesis.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is correct?
a. All biodiversity hotspots are protected areas. b. All seven continents have biodiversity hotspots. c. Most biodiversity hotspots are near the equator. d. North America has the most biodiversity hotspots
All of the following are true about a partition coefficient except
A) it is the ratio of solubility in an organic solvent to solubility in water. B) it can be used to predict the probability that an amino acid is part of a transmembrane region of a protein. C) it is high for a molecule that readily crosses membranes by simple diffusion. D) it is the concentration at which the rate of transport is half maximal. E) it depends on the polarity of the molecule.
Showy flowers are most likely pollinated by
a) water only. b) wind only. c) insects or birds.