What is the function of the high temperature step in PCR (polymerase chain reaction)?
A) activation of the DNA polymerase
B) allowing primers to bind complementary sequences
C) facilitate DNA synthesis
D) deactivate DNA polymerase to pause synthesis
E) break hydrogen bonds for strand separation
E
Bloom's Taxonomy: Comprehension
Section: Techniques of Recombinant DNA Technology
Learning Outcome: 8.12
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The compound 2,4,5-trichlorophenoxyacetic acid is a synthetic auxin that is used as an herbicide. It is applied by spraying it on the plant
After spraying with synthetic auxin, the plant undergoes a short period of what appears to be rapid growth and then wilts and dies. Which of the following statements could explain how a synthetic auxin kills weeds? A. The herbicide causes the leaves to grow quickly. More photosynthesis occurs, but the increase in sugar production blocks phloem vessels and the plant dies. B. The plant grows so rapidly that the cellular integrity of the plant is destroyed (i.e., cell walls break down), damaging transport systems within the plant. C. Spraying the plant clogs the stomata, so photosynthesis can no longer occur. D. The synthetic auxin cannot move through PIN channels, thus destroying the natural auxin concentration gradient and inhibiting growth.
When a mature mRNA is translated, all the nucleotides encode amino acids except __________
a. leader sequence at the 3? end of the mRNA b. trailer sequence at the 3? end of the mRNA c. leader sequence at the 5? end of the mRNA d. Both a and b e. Both b and c
Fats and oils function better than other biological molecules as energy-storage molecules because of the carbon they contain.
Answer the following statement true (T) or false (F)