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

Biology & Microbiology

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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

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Platelets function to engulf foreign cells by phagocytosis

Indicate whether the statement is true or false

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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

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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

Biology & Microbiology