Which of the following is part of explaining cancer with the disposable soma hypothesis?
a. Cancer is only caused by mutations in the germ line.
b. Despite selection for the most accurate DNA proofreading and repair mechanisms, it is impos-sible to prevent every single mutation.
c. There is a trade-off between the number of gametes and the accuracy of genetic transmission in gametes.
d. Cancer almost always affects somatic cells.
D
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________ membranes allow some molecules to pass but not others.
A. Selectively permeable B. Inverted monolayer C. Impermeable D. Permeable
Microbial diversity in humans
What will be an ideal response?
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
Two diseases that represent high-priority threats as biological weapons today are
A) smallpox and typhus. B) syphilis and HIV. C) anthrax and botulinum. D) anthrax and Salmonella.