Probable factors that affect the passage of materials across cell membranes include all of the following except ____________.

a. concentration
b. size
c. color
d. charge


Answer: c. color

Biology & Microbiology

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In the electron transport system

A. NADH and FADH2 both donate electrons at the same location. B. NADH donates electrons "upstream" of where FADH2 donates electrons. C. NAD donates electrons at the head of the chain. D. NADP donates electrons in the middle of the chain.

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Amphibians, reptiles, and mammals pass through embryonic stages in which they have tails and webbed fingers and toes

Indicate whether the statement is true or false

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Nutrient absorption is mediated by the

A. peptidoglycan layer. B. nuclear membrane. C. cell wall. D. cell membrane. E. proteins in the periplasmic space.

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Burkholderia was reclassified from the gammaproteobacteria to the betaproteobacteria because

A) it grows in disinfectants. B) it is a gram-negative rod. C) it causes infections in cystic fibrosis patients. D) it causes melioidosis. E) its rRNA sequence is similar to that of Neisseria.

Biology & Microbiology