Question $28$

$1\mathrm{.}76$ pts

While there are minor differences between aerobic and anaerobic cellular respiration, the major difference is the terminal electron acceptor in

anaerobic cellular respiration is any organic molecule other than oxygen.

anaerobic cellular respiration is any inorganic molecule other than oxygen.

aerobic cellular respiration is any organic molecule other than oxygen.

There are no major differences.

Question $49$

$1\mathrm{.}76$ pts

In mice, the $L_{50}$ for Staphylococcal enterotoxin is $1350n\frac{g}{k}g,$ and the $L{D}_{50}$ for Shiga toxin is $250n\frac{g}{k}g.$ Which of the following statements is true?

More organisms of Staphylococcal bacteria must be ingested to cause infection, as compared to Shigella bacteria.

The Shigella bacteria secretes a weaker toxin that that of Staphylococcus.

Shiga toxin is more lethal than Staphylococcal enterotoxin.

Staphylococcal enterotoxin is the more lethal of the two toxins.