How do the various membranes of a cell differ?
a. Only certain membranes are constructed of a selectively permeable membrane.
b. Certain proteins are unique to each membrane.
c. Phospholipids are found only in certain membranes.
d. Only certain membranes are constructed from molecules with dual solubility.
Ans: b. Certain proteins are unique to each membrane.
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The ________ valves prevent blood from flowing back into the heart once it has left the ventricles
Fill in the blank(s) with correct word
Which cells directly attack abnormal cells in the body?
a. Cytotoxic T cells b. Helper T cells c. Phagocytes d. B cells
Dogs scent-mark by defecating and urinating in an area, while cats scent-mark by rubbing against objects. Both of these increase the animals level of fitness and are examples of
A. sexual selection. B. altruism. C. territoriality. D. foraging.
In the pressure-flow mechanism, loading of sucrose from companion cells to sieve-tube elements takes place through _____
A) plasmodesmata B) facilitated diffusion C) sucrose-H+ symporters D) sucrose-H+ antiporters