Which of the following is the primary reservoir of the mycobacterium responsible for leprosy?
A. Infected humans
B. Infected animals
C. Contaminated foods
D. Contaminated objects
Ans: A. Infected humans
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Green sulfur bacteria are often found at the greatest depths of all phototrophic cells in lakes, oceans, and microbial mats. This is because green sulfur bacteria
A) are very sensitive to UV irradiation, despite their reliance on light for energy. B) are the only phototrophs that can use hydrogen sulfide as an electron donor for photosynthesis. C) are strict anaerobes. D) have chlorosomes that are very efficient at harvesting light, allowing them to perform photosynthesis where light intensities are very low.
Explain why the plasma membrane is permeable to some substances, while others require a channel or carrier protein to cross the membrane
What will be an ideal response?
Which of the following statements concerning an exoskeleton is false?
a. It is composed of living tissue that grows along with the animal. b. Although the exoskeleton is rigid, it allows for flexibility. c. It may act as an anchor to which muscles attach. d. It is capable of providing protection against predators or pathogens. e. Animals with exoskeletons must undergo a molting process
Alfred Russell Wallace developed a theory of evolution very similar to Charles Darwin's
a. true b. false