Of all the different codons that exist, three of them do not encode a particular amino acid. Their role is to:
a. allow for any amino acid to be added in their place.
b. encode tRNA molecules.
c. provide instructions on the tertiary structure of the protein.
d. signal the start of translation.
e. provide instructions to stop translation.
e
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Thermostable proteins tend to have additional features that improve thermostability. Which of the following is NOT one of these features?
A) increased ionic interactions on the protein surfaces B) highly hydrophilic cores C) decreased tendency of the protein to unfold D) highly hydrophobic cores
Tryptophan must be ______ when tryptophan repressor molecules are inactive.
A. Present B. Absent
Which of the following interact with the enhancer and promoter regions?
a. DNA bending proteins b. cis-acting element c. transcription factors d. repressors
Blood passing out of arterioles next enters the ____
a. capillaries b. arteries c. veins d. venules e. lymphatic vessels