The function of the epididymis is to:
a. secrete an alkaline fluid that neutralizes the acids of the vagina.
b. produce a nutritive fluid for the sperm.
c. provide a place for maturation and storage of sperm.
d. secrete mucus that lubricates the penis.
e. maintain sperm at a low body temperature
c
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Currently the two main vectors for delivery of therapeutic genes for human gene therapy are
A) AAV and retroviruses. B) AAV and Agrobacterium. C) Retroviruses and Agrobacterium. D) AAV and P elements.
The population is in exponential growth at
a. A. b. B. c. C. d. D. e. E.
Which of the following syndromes has a karyotype with a missing X chromosome?
A. Jacobs syndrome B. Turner syndrome C. Williams syndrome D. Klinefelter syndrome E. Down syndrome
Why have plants been implicated in the Ordovician and Devonian glaciations, but not the Proterozoic glaciations?
A. Land plants had not yet evolved during the Proterozoic. B. Proterozoic plants had simple root structures that did not increase rock weathering. C. Proterozoic plants used anoxygenic photosynthesis. D. The nonvascular plants present during the Proterozoic did not contribute to global nutrient cycles.