Proteins made by a ribosome reading through a transcript's stop codon without their own discrete ribosome binding sites
A) are thought to be a primitive mechanism to avoid host defenses.
B) appear most abundant in archaeal viruses and relatively uncommon in bacteriophage.
C) suggest a relatively low level of protein product is essential for the virus due to its rare frequency.
D) create opportunities for viruses to make different capsid proteins.
Answer: C
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Which of the following BEST describes the process of nitrification?
a. N2 ? NH4 + b. NH4 + ? N2 c. N2 ? NO3 ? d. NO3 ? ? N2 e. NH4 + ? NO3
The unique chemical qualities of individual amino acids do not directly determine the function of an enzyme. What, then, is the role of the individual amino acid's unique chemical qualities, and what directly determines the function of an enzyme?
What will be an ideal response?
Which of the following directors of embryonic development can be found within unfertilized eggs of protostomes?
A. mRNAs transcribed from embryonic genome B. bindin proteins C. tissue-specific proteins D. cytoplasmic determinants
Which of the following factors might cause checkpoint genes to interrupt cell division?
A. Neurological signals sent from the brain tell the cell to stop. B. The cell's DNA has been damaged somehow. C. There are not enough nutrients to support cell division. D. The cell's DNA was replicated incorrectly.