The molecule that functions as a corepressor for the trp operon is

A. lactose.
B. CAP.
C. tryptophan.
D. glucose.
E. cAMP.


Answer: C

Biology & Microbiology

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The swelling of a food-containing can is frequently due to the production of ________ by spoilage microbes.

A. nitrogen gas B. oxygen gas C. carbon dioxide gas D. All of the choices are correct.

Biology & Microbiology

Which statement does NOT distinguish Darwin’s theory of natural selection from earlier descriptions of biological

diversity and adaptive traits?

a. Biological diversity has purely physical, rather than spiritual, origins. b. Evolutionary change occurs in groups of organisms, rather than in individuals. c. Spiritual explanations account for the origin but not the diversification of individuals. d. Some organisms function better than others in a particular environment. e. Evolution is a multistage process and natural selection eliminates unsuccessful variations.

Biology & Microbiology

Which scientist was a skilled lens maker and first observed cell structure in protists?

a. Robert Hooke b. Theodor Schwann c. Anthony van Leeuwenhoek d. Matthias Schleiden

Biology & Microbiology

The passageway that extends from the middle ear to the throat is the ________; this structure equalizes air pressure in the middle ear with atmospheric pressure

Fill in the blank(s) with correct word

Biology & Microbiology