Which protein group links cells together by recognizing and binding receptors or chemical groups on other cells or the
extracellular matrix?
a. transport proteins
b. recognition proteins
c. receptor proteins
d. cell adhesion proteins
e. nuclear proteins
ANSWER: d
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Which type of membrane transport is most important for nutrient acquisition in nutrient poor environments?
A. Facilitated diffusion through channel proteins B. Facilitated diffusion through membrane carrier proteins C. Simple diffusion D. Active transport
Water reabsorption into the capillaries associated with a nephron is achieved principally by
a. bulk flow. b. active transport and diffusion. c. countercurrent multiplication. d. phagocytosis. e. endocytosis.
Which stimulus would the brain interpret as the strongest?
A) 100 action potentials per second B) 5 action potentials per second C) 20 action potentials per second D) 50 action potentials per second E) 10 action potentials per second
Many exoenzymes from pathogens are virulence factors.
Answer the following statement true (T) or false (F)