If you observed a series of blood samples from a patient who was recovering from an infection, and you saw that T and B cells were reducing their activity in successive samples, you would suspect the activity of what?
A. mast cell
B. cytotoxic T cell
C. suppressor T cell
D. memory B cell
E. natural killer cell
Answer: C. suppressor T cell
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In passive transport, the movement of a small,
nonpolar molecule across a cell membrane depends on
a. adequate amounts of ATP. b. a concentration gradient. c. adequate ATP and a concentration gradient d. the proper transport protein. e. gated channels.
The ability to stand upright and walk on two legs is termed ________
Fill in the blank(s) with correct word
Why is baker's yeast useful for expressing genetically engineered genes?
a. The yeast cells are best suited for making human products for medical use. b. Yeast cells are eukaryotic and so would likely be successful in expressing eukaryotic genes. c. Many inducible promoters from the yeast genome have been cloned, such as the lac operon. d. The yeast cells do not secrete their protein products.
The appearance of an egg outside of a goose's nest is called
A. an innate releasing mechanism. B. a sign stimulus. C. imprinting. D. a fixed action pattern.