What is the general term for a state in which two organisms live together in close association?
a. parasitism
b. symbiosis
c. mutualism
d. commensalism
Ans: b. symbiosis
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Where in a plant cell are chloroplasts found?
a. on the cell membrane b. in the cytoplasm of the cell c. in the stroma d. in the thylakoids e. none of these
Platelets function to engulf foreign cells by phagocytosis
Indicate whether the statement is true or false
Select the best response to the question. ?Which of the following patients are at high risk for developing ?Pneumocystis jiroveci? pneumonia (PJP)?
A) a patient who has had a liver transplant B) a patient with severe lung disease C) a patient who has had a myocardial infarction ("heart attack") D) a patient who has taken several different antibiotics in the past 3 months
Which of the following is probably the main factor responsible for the phenomenon of density-dependent inhibition?
A) a local accumulation of growth-inhibiting factors B) cells' innate ability to "sense" when the organ of which they are a part has no need for additional cells C) a local deficiency of nutrients D) physical contact of cell-surface proteins between adjacent cells