Dinoflagellates
a. may produce red tides that poison and kill fish.
b. produce a poison that builds up in the tissues of
shellfish and may kill humans who eat infected
shellfish.
c. may undergo a population explosion that turns
the ocean red or various colors.
d. commonly are photosynthetic marine plankton.
e. are all of these.
Answer: e
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The final step of the citric acid cycle oxidizes malate to oxaloacetate and reduces NAD+. What is the purpose of this
step?
a. to replenish the supplies of NAD+ b. to replenish free CoA c. to regenerate oxaloacetate to attach another acetate molecule d. to produce ATP by substrate-level phosphorylation e. to produce ATP by oxidative phosphorylation
Suppose the lacI repressor gene were permanently silenced by an alteration to the DNA sequence
What would be the impact on the expression of the lac operon?
a. The lac operon would be transcribed but at a low level. b. The lac operon would be transcribed at a high level. c. There would be no real impact on lac operon expression. d. The lac operon would only be expressed when lactose was present. e. The lac operon would not be expressed even when lactose was present.
Which of the following are most closely related to
the choanoflagellates? a. animals b. fungi c. amoebozoans d. algae e. none of these
What is the theoretical limit of resolution of a light microscope used to look at a sample through oil?
a. 0.22 micrometers b. 0.2 nanometers c. 1 millimeter d. 0.305 micrometers