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

Biology & Microbiology

You might also like to view...

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.

Biology & Microbiology

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.

Biology & Microbiology

Which of the following produces both a cytotoxin and an enterotoxin?

A) Clostridium botulinum B) Clostridium difficile C) Clostridium tetani D) Corynebacterium diphtheriae

Biology & Microbiology

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.

Biology & Microbiology