Researchers hypothesize that the first self-replicating molecule may have been ____. This is known as the ______world hypothesis.
a. RNA, RNA
b. DNA, RNA
c. lipid, lipid
d. protein, protein
Ans: a. RNA, RNA
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A mutation that results in premature termination of translation _____
A) is a silent mutation B) is a nonsense mutation C) usually has no effect on the function of the protein D) is a missense mutation
Which one of the following statements about regulation of translation is incorrect?
A. Translation initiation complexes recognize and bind to the 5' cap. B. The translation initiation complex scans for an AUG codon near the 5' cap. C. The 5'UTR sequence affects the efficiency of translation initiation. D. Regulation of translation does not depend on sequences in the 3'UTR or the poly(A) tail. E. One of the key variables for influencing efficient translation is the sequence of nucleotides flanking the AUG codon.
The tertiary structure of a protein is dependent on
A. the side chain composition of each amino acid within the protein. B. hydrogen bonding between the carboxyl and amino groups within the polypeptide chain. C. the interactions of multiple polypeptide chains that make up a functional protein. D. the way in which the peptide bond forms. E. the degree through which the dehydration reaction occurs.
Which of the following is NOT a trait shared between green algae and land plants?
a. stomata b. chloroplasts with chlorophyll a c. cellulose in their cell walls d. store energy captured during photosynthesis as starch e. chloroplasts with chlorophyll b