Explain the need for, and action of, DNA gyrase in bacterial DNA replication
What will be an ideal response?
DNA helicase induces supercoiling (tension) in the parental DNA as it processes. DNA gyrase relieves this tension so that replication fork progression can continue without grinding to a halt.
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Clostridium, Lactobacillus, and Propionibacterium all
A. use sulfur compounds as terminal electron acceptors. B. oxidize inorganic compounds. C. oxidize organic compounds. D. use organic compounds as terminal electron acceptors. E. oxidize organic compounds AND use organic compounds as terminal electron acceptors.
The driving force for blood circulation is ____
a. contraction of the atria b. contraction of the ventricles c. closing of the AV valves d. opening of the AV valves e. closing of the aortic valve
The pancreatic secretions governing glucose levels are precisely controlled by
a. neural connections to the pancreas. b. the blood-brain barrier. c. cooperative interactions. d. homeostatic feedback loops. e. releasing factors.
A(n) ____ taxies foreign DNA into a host cell that can divide rapidly
a. primer b. intron c. DNA clone d. exon e. codon