Plasma membranes are selectively permeable. This means that
A) anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy.
B) the plasma membrane allows some substances to enter or leave a cell more easily than others.
C) glucose cannot enter the cell.
D) plasma membranes must be very thick.
Answer: B
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The best explanation for why a mouse develops into a mouse and not a human is
A. most of the coding genes are different. B. most of the non-coding genes are different. C. gene expression differs. D. the genes are mostly the same but have been rearranged. E. synteny has not been conserved.
What is the primary function of the transverse tubules?
A. Conduct action potentials from the surface of the muscle fiber to internal regions near myofibrils. B. Act as a channel for Ca2+ ions during excitation-contraction coupling. C. Form cross-bridges between actin and myosin during muscle contraction. D. Attach troponin to tropomyosin. E. Attach muscle fibers to skeletal elements to exert force.
Which of the following produces both a cytotoxin and an enterotoxin?
A) Clostridium botulinum B) Clostridium difficile C) Clostridium tetani D) Corynebacterium diphtheriae
Which of the following floral structures are present during the diploid stage of a flowering plant's life cycle?
A. Anther B. Pollen grain C. Ovule D. Sporophyte E. Everything except the pollen grain.