Lactate fermentation transfers the electrons and hydrogen ions carried by NADH directly to ____

a. acetaldehyde
b. pyruvate
c. carbon dioxide
d. oxygen
e. myoglobin


ANSWER: b

Biology & Microbiology

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An example of density-dependent regulation is shown in this graph with results from a study focusing on the giant intestinal roundworm (Ascaris lumbricoides), a parasite of humans and other mammals. Denser populations of the parasite contained fewer eggs. One possible explanation for this is that females would be smaller in more dense populations (due to limited resources) and that smaller females would have fewer eggs. This hypothesis was tested and disproved in a 2009 study which showed that female weight had no influence. Given that each female was producing fewer eggs, why was the population continuing to grow?


a. More worms were moving in from adjacent populations.
b. The population was expanding due to increased mating.
c. With lower population densities, mortality decreased.
d. Lifespans were extending due to lower egg production.

Biology & Microbiology

In any ecosystem, short food chains are more efficient than longer ones. Why is this so?

What will be an ideal response?

Biology & Microbiology

The type of contraception that works because

ovulation is prevented is a. the rhythm method. b. tubal ligation. c. birth control pills. d. a diaphragm. e. a condom.

Biology & Microbiology

Loss of the cell wall is required for the endosymbiotic theory.

a. true b. false

Biology & Microbiology