A phospholipid is composed of
A) one fatty acid molecule linked to three glycerol molecules.
B) one glycerol molecule linked to three phosphate groups.
C) one fatty acid molecule linked to one glycerol molecule and two phosphate groups.
D) one glycerol molecule linked to one phosphate group and two fatty acids.
Answer: D
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Why might an individual with an STI need to be checked for other STIs, even though he/she has no symptoms of any others?
A. Several STI-causing pathogens are known to 'piggy back' on each other, being carried into the genital tract together. B. A diagnosis of an STI implies that the individual engaged in unprotected sexual intercourse. Several STIs are largely asymptomatic, so it is wise to test for a variety of typical STIs when the patient admits to or shows signs of engaging in such risky behavior. C. They don't need to be tested-all STIs are highly obviously symptomatic, so there is no need to test for other diseases than the one currently manifesting itself in the patient. D. It's a public health issue-it's best to know who is positive for what in the population of sexually-active individuals. This lets healthcare professionals act to best safeguard the population as a whole from the range of STIs.
What is the term used to describe the ability to maintain a constant body temperature?
a. Homeothermic b. Heterothermic c. Endothermic d. Exothermic
Which of the following best describes opportunistic or r-strategy, organisms?
A . They reach sexual maturity rapidly B. They reach their adult size slowly C. They attain a large body size D. They live for a long time E. The size of their population remains fairly constant
____ is NOT a product of the Kreb cycle.
A. Pyruvic acid B. ATP C. NADH2 and FADH2 D. CO2