Which of the following statements is the best definition of a telomerase?
A. Telomerase is an enzyme that helps solve the "end replication problem."
B. Telomerase is an enzyme that helps separate DNA strands.
C. Telomerase is an enzyme that cleaves introns and exons.
D. Telomerase is an enzyme that helps proofread and correct newly synthesized DNA.
Answer: A
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Sidney Brenner found bacteriophage T4 point mutants in which a protein was prematurely terminated. The premature termination point of the protein was different in different mutants
When he determined where the protein synthesis terminated for each mutant, in every case the next amino acid of the protein would have been a glutamine, lysine, glutamic acid, tyrosine, or serine. What is the unique similarity of these amino acids or their codons that would play a role in the premature termination of translation in the mutant protein gene? A. Each of the amino acids has an R-group containing an amine, hydroxyl, or carboxyl group. B. Each of the codons for these amino acids contains either U or G. C. Each of the codons for these amino acids could be changed to UAG with a single nucleotide mutation. D. Each of the amino acids is polar and charged.
DNA sequence evidence suggests that plants, fungi, and animals arose from different lineages of unicellular protists. This suggests which of the following?
A. Protists arose before the other three kingdoms. B. Early ancestors to plants, fungi, and animals could interbreed. C. Multicellular organisms only arose once in evolutionary history. D. The animal, plant, and fungal kingdoms contain some single-celled organisms. E. All unicellular organisms are now extinct.
Which of the following is NOT a characteristic
of Australopithecus afarensis?
a. chimpanzee sized brain b. narrow pelvis c. S-shaped backbone d. opening at the base of the skull e. more than one of these is NOT a characteristic of A.afarensis
Mutation of the APC gene has been identified as the first step toward development of
A. breast cancer. B. familial adenomatous polyposis (FAP). C. hereditary nonpolyposis colon cancer (HNPCC). D. retinoblastoma. E. acute myeloblastic leukemia.