Which of the following statements is not true concerning peptidyl transferase?
A) It is a ribozyme having catalytic activity.
B) It catalyzes peptide bond formation.
C) It moves the ribosome, so translation continues.
D) It is associated with the large subunit of ribosomes.
E) It requires no outside source of additional energy, such as ATP.
C) It moves the ribosome, so translation continues.
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What contains both vector DNA and chromosomal DNA?
A. recircularized vectors B. recombinant vectors C. open vectors
Which statement about the geologic time scale
is incorrect? a. Mammals originated early in the Mesozoic era. b. Adaptive radiation of flowering plants, insects, and birds took place during the Mesozoic era. c. Mass extinction of the dinosaurs occurred about 65 million years ago. d. Reptiles originated during the Paleozoic era. e. Eukaryotes originated during the Proterozoic eon.
What occurs in a missense mutation?
a. All of the amino acids beyond the mutation point are changed. b. A nucleotide is added to the DNA. c. A nucleotide is deleted from the DNA.
d. A single amino acid is substituted for another in a protein. e. The protein is always completely nonfunctional.
Differentiate between the following specialized roots
A. prop root B. buttress root C. pneumatophore D. storage root E. photosynthetic root What will be an ideal response?