Evidence for the three domain system comes from sequencing the rRNA that changes slowly during evolution.
a. true
b. false
Ans: a. true
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Imagine that you are a biologist attempting to get an accurate measure of an animal's basal metabolic rate. The best time to measure the metabolic rate is when the animal _____
A) is resting and has not eaten its first meal of the day B) is resting and has just completed its first meal of the day C) has recently eaten a sugar-free meal D) has not consumed any water for at least forty-eight hours E) has just completed thirty minutes of vigorous exercise
In negative feedback, the variable being regulated is changed in the _______ direction, while in positive feedback the variable is changed in the ________ direction.
A. same, opposite B. decreasing, increasing C. negative, positive D. inhibitory, stimulatory E. opposite, same
HIV destroys the immune system by primarily destroying
A) cytotoxic T cells. B) B cells. C) helper T cells. D) erythrocytes.
When comparing viruses and bacteria, which one of the following statements is CORRECT?
A) Viruses are larger than bacteria. B) Viruses are pathogens; bacteria are decomposers. C) Viruses have membrane-bound organelles; bacteria do not have membrane-bound organelles. D) Viruses and bacteria are both able to reproduce on their own. E) Viruses and bacteria both contain genetic material.