The plasma membrane is a semipermeable membrane. This means that it is:

A) only permeable to cholesterol.
B) permeable to large charged molecules but not to small uncharged molecules.
C) permeable to small molecules except water.
D) permeable to small and uncharged molecules but not to larger or charged substances.


Answer: D

Biology & Microbiology

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Lactic acid and ethanol fermentation differ in that:

A. FADH2 is oxidized to FADH in lactic acid fermentation, but NADH is oxidized to NAD+ in ethanol fermentation. B. NADH is oxidized to NAD+ in lactic acid fermentation, but FADH2 is oxidized to FADH in ethanol fermentation. C. lactic acid fermentation produces ATP by substrate level phosphorylation, but ethanol fermentation does not. D. ethanol fermentation produces ATP by substrate level phosphorylation, but lactic acid fermentation does not. E. ethanol fermentation produces CO2, but lactic acid fermentation does not.

Biology & Microbiology

Infections caused by fungi are called mycoses.

Answer the following statement true (T) or false (F)

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When Hershey and Chase labeled viruses with radioactive phosphorus, they concluded that the virus

injects DNA and not protein into its host because the

a. radioactive protein ended up inside the bacterium b. radioactive DNA ended up inside the bacterium c. both radioactive DNA and protein ended up inside the bacterium d. neither radioactive DNA nor protein ended up inside the bacterium e. entire virus ended up inside the bacterium

Biology & Microbiology

List the four primary female reproductive hormones, and the gland(s) that produces them

What will be an ideal response?

Biology & Microbiology