Which event occurs during the elongation stage?
A. tRNA transfers mRNA to the ribosomes.
B. Free amino acids bind to the mRNA binding site.
C. Anticodons bind to complementary codons.
D. A stop codon enters the ribosome.
E. rRNA catalyzes the formation of peptide bonds.
Answer: E
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An allosteric enzyme:
a. has an active site where substrate molecules bind and another site that binds with regulatory molecules b. is an important energy-carrying nucleotide c. carries out either oxidation reactions or reduction reactions, but not both d. raises the activation energy of the chemical reaction it catalyzes e. only participates in feedback inhibition pathways
Which of the following carries amino acids to
ribosomes, where amino acids are linked into the primary structure of a polypeptide? a. mRNA b. tRNA c. hnRNA d. rRNA e. all of these
You arrive late to a biological seminar. However, just as you enter the room, you hear the speaker referring to the "amino end" and the "carboxyl end" of a macromolecule. Immediately, you know that they are talking about a:
A. carbohydrate. B. nucleic acid. C. protein. D. lipid.
Which of the following is NOT true about antineopalstics?
A) they block DNA replication B) they block mitosis C) they kill only cancer cells D) they block protein and RNA synthesis