Who was the FIRST microbiologist to study Bacillus anthracis and its ability to cause disease in mice?
a. Joshua Lederberg
b. Robert Hooke
c. Louis Pasteur
d. Robert Koch
Answer: D
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The symbiotic relationship in which the symbiont benefits from the relationship but the host is neither harmed nor benefited is called:
a. mutualism. b. parasitism. c. commensalism. d. competition. e. niche interactivity.
What is the sticky female region of a flower that is specialized for receiving pollen?
a. stamen b. stigma c. anther d. ovary e. endosperm
Why are mitochondria present in the sperm?
a. To provide energy for the movement of the flagellum b. To provide energy for the acrosome to penetrate the egg c. To provide nutrients for the sperm d. To provide nutrients for the developing embryo e. To provide energy for the maturation of the sperm
Which of the following is correct regarding r-selection?
A. It favors quickly producing as many offspring as possible at low population density. B. At a higher population density, r-selection favors fewer, high-quality offspring. C. R-selection is exhibited by most equilibrial species. D. Species not described by K-selection are entirely explained by r-selection alone. E. None of these are correct.