Which statement best describes the phenomenon of antibiotic resistance in bacteria?
A) For a particular antibiotic, all bacteria are either completely resistant or completely sensitive.
B) When a type of bacteria is resistant to antibiotics, it's resistant to all antibiotics.
C) Resistance is a matter of degrees; resistance can be partial or total, and resistance to each antibiotic is a separate trait.
D) Resistance to antibiotics is a trait that didn't exist before antibiotics were developed for pharmaceutical use.
C
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Which of the following is the role of calcium-dependent protein kinases?
A. receptor molecule B. affector molecule C. messenger molecule D. effector molecule E. all of the choices
In the figure above, which fatty acids are most likely to be solid at room temperature?
a. I b. II, III and IV c. II, III, IV and V d. I and IV e. I and V
Which of the following is a behavioral pattern that results from a proximate cause?
A) A male sheep fights with another male to improve its social position and find a mate. B) A female bird lays its eggs when day length begins to shorten. C) A cat kills a mouse to obtain food. D) A cockroach runs into a crack in the wall and avoids being stepped on. E) A goose squats and freezes motionless to escape a predator
In humans, B cells mature in the _____, and T cells mature in the _____.
A) GALT, liver B) lymph nodes, spleen C) bursa, thymus D) bone marrow, thymus