What prevents ions from crossing the plasma membrane via
simple diffusion?
a. ions are too large.
b. ions carry a charge.
c. ions are hydrophobic.
d. ions do not produce a concentration difference.
e. ions cannot interact with membrane-bound
proteins.

the right answer is a. skin cells forming from sunlight.

the liver is an organ endowed with a fantastic ability to regenerate

. thus, if a hepatectomy (ablation) of 70% of the hepatic mass is performed in the rat, there is complete recovery in 7 to 10 days.

prokaryotes are beings that have existed since the existence of life on earth, and do not come from another realm.

ribosomes are organelles that exist naturally in eukaryotes, either in free form or attached to the endoplasmic reticulum.

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