A genetic mutation results in the inability for a cycad to produce coralloid roots. What types of soils would be least conducive to the survival of this cycad relative to members of the species not affected by this mutation?
A. soils saturated with water
B. soils with lower pH
C. soils with lower mean temperatures
D. drier soils
E. soils with lower nitrogen
Answer: E
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During cell division the progeny of a trypanosome express a different VSG gene than their parents. Why is this done?
A. To hide from the host's immune system. B. To signal endocytosis of the parasites. C. VSG genes inhibit phagocytosis. D. VSG genes activate photoheterotrophy.
Neurons that carry messages from sensory receptors to the CNS are
a. sensory. b. motor. c. interneurons. d. both a and b.
What are the three structures that add secretions to the sperm to make up semen?
A) seminal vesicles, Leydig cells, and prostate gland B) prostate gland, seminal vesicles, and seminiferous tubules C) bulbourethral glands, Leydig cells, and seminal vesicles D) seminal vesicles, prostate gland, and bulbourethral gland
How many biological safety levels are there?
A. 5 B. 2 C. 4 D. 8