Which of the following statements about peroxisomes is INCORRECT?
A. They were once viewed as semiautonomous.
B. They assist in detoxifying molecules.
C. They possess a single membrane.
D. They possess their own DNA.
E. They possess an enzyme that prevents accumulation of hydrogen peroxide and free radicals.
D. They possess their own DNA.
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There are, currently, approximately how many named extant species of plants?
a. 12,000 d. 1,200,000 b. 120,000 e. 2,600,000 c. 260,000
When a "new" antigen first challenges the immune system, if the primary immune response produces B cells, what are the fates of those B cells?
I-Some of the B cells become plasma cells that secrete antibodies. II-Some of the B cells become memory cells and can produce a swifter response if the body encounters that particular antigen again. III-Some of the B cells secrete chemicals called pyrogens that travel to the brain inducing a fever. A. just II B. just I C. II and III D. I and II E. I, II, and III
Coccolithophores use ________ for a method of swimming
a. flagellates b. cilia c. appendages d. jet propulsion
Ectothermic animals:
a. are more likely to use metabolism for heat b. shun the sun during the daylight hours c. are more adapted to cold d. are more likely to use behavioral temperature regulation e. maintain their body temperature within a narrower range