Babies born before _____ after fertilization are considered premature.
A. 36 weeks
B. 37 weeks
C. 38 weeks
D. 39 weeks
E. 40 weeks
Answer: A
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The main reason that mRNA transcripts are modified at the 5' and 3' ends is:
A. to ensure that all nucleotides are phosphorylated. B. to protect the RNA from nucleolytic degradation. C. so that the two ends remain associated with each otherduring transport. D. to guide the removal of introns.
What enzyme catalyzes the attachment of amino acids to tRNA molecules?
A. helicase B. topoisomerase C. aminoacyl-tRNA synthetase D. ribosome E. translation factor
What is one of the benefits of genetic engineering of plants?
A.) reduced diversity among crop plants B.) increased allergies to plants and pollen C.) elimination of natural crop pollinators D.) enhanced disease resistance in crops
Enzymes (such as polymerases or nucleases) that stay engaged with their substrates for repeated catalysis are said to be
a. committed. b. elongating. c. stable. d. distributive. e. processive.