Under high tryptophan conditions, tryptophan binds to and activates the repressor protein, thereby blocking
transcription of the trp operon. This is an example of:
a. protein degradation.
b. negative control of inducible genes.
c. negative control of repressible genes
d. positive control of inducible genes.
e. positive control of repressible genes.
ANSWER: c
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Cytoskeletal elements are found in the
A) Eubacteria. B) Archaea. C) Eukarya. D) choices B and C only E) all of the above
The enzyme that fixes carbon dioxide into the
Calvin-Benson cycle is
a. rubisco b. carbon dioxide oxidase c. ATP synthase d. carbon hydrogenase e. pepsin
If there is life on another planet within our galaxy, why would we expect to learn that this life would probably use the same narrow range of wavelengths of the electromagnetic spectrum as we do for a source of energy and information?
a. because all life must use the same electromagnetic spectrum by definition b. because of the fundamental aspects of photon energy and light absorption c. because this is the same wavelength that hits the Earth d. because there is no other wavelength available in nature
If a protein is supposed to consist of the amino acid sequence valine-valine-histidine and instead it consists of the sequence alanine-valine-histidine, most likely
A. there has been a point mutation in the first codon. B. there has been a point mutation at the eighth base pair. C. the change will not be noticed. D. this is a gross mutation; the organism will not survive.