Paramyxoviruses evade the host immune system by
A. a display of host antigens on its surface.
B. entering new cells by inducing syncytia formation.
C. producing an inhibitor specific for lymphocyte receptors.
D. infecting only red blood cells.
Answer: B
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A person with a glucagon deficiency would most likely have difficulty
a. producing enough urine to remove waste products. b. synthesizing glycogen in the liver. c. allowing circulating glucose to enter cells. d. producing insulin after a meal. e. keeping up blood sugar between meals.
Experimentally heating amino acids and exposing them to water resulted in ________
a. living cells b. protocells that could capture energy, concentrate materials, and replicate themselves c. denatured proteins d. proteins identical in sequence to some found in modern animals
________ is a directional movement in response to a graded chemical stimulus.
Fill in the blank(s) with the appropriate word(s).
A collection of clones containing all the DNA sequences carried by an individual is called a genomic library
a. True b. False