A chemical or physical agent that interacts with DNA and causes a mutation
What will be an ideal response?
Mutagen
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Which of the following best describes the tRNA binding sites of the ribosome?
A. Only one of the three sites can be occupied by a tRNA molecule at any given time. B. Each tRNA that associates with the ribosome must first bind in the P site and then move to the A site. C. The P site contains the tRNA molecule covalently bound to the growing chain of amino acids. D. All tRNAs leave the ribosome through the A site.
A lipid __________ is the most common
conformation of the membrane of living systems. Fill in the blank(s) with the appropriate word(s).
Transmission of the nerve impulse across a synapse is accomplished by
a. the release of Na+ at the presynaptic membrane b. the release of neurotransmitters at the postsynaptic c. the reception of neurotransmitters at the postsynaptic membrane d. only a and c are correct
Which of the following steps has not yet been accomplished by scientists studying the origin of life?
a. Synthesis of small RNA polymers by ribozymes b. Abiotic synthesis of polypeptides c. Formation of molecular aggregates with selectively permeable membranes d. Formation of protocells that use DNA to direct the polymerization of amino acids e. Abiotic synthesis of organic molecules