How might a thermophilic bacterium use chromosome structure to protect against heat-induced DNA degradation?
A) It expresses excess amounts of SMC proteins that allow the DNA to more tightly condense during periods of high heat.
B) It can express a specialized topoisomerase that induces negative supercoiling, which provides additional chromosomal stability.
C) It expresses a specialized topoisomerase that induces positive supercoiling, which provides additional chromosomal stability.
D) It expresses enzymes that inhibit topoisomerase during high heat, which prevents DNA from unwinding and becoming susceptible to heat degradation.
E) It expresses helicase, an enzyme that nicks the DNA helix and allows it to assume a more stable conformation and thus to resist heat-induced degradation.
C
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A cell or cell component that changes in response to specific stimuli is a(n) ________
a. feedback mechanism b. effector c. receptor d. integrator
A diploid germ cell will produce cells that have reduced the chromosome number by half generating four haploid nuclei in
A. fertilization. B. mitosis. C. meiosis. D. replication. E. mutation.
After falling down a flight of stairs, it feels like you broke your ankle; however the emergency room doctor says you tore a ligament. This means you tore the
A) connective tissue band that attaches muscle to bone. B) the cartilage in your ankle joint. C) insertion of a muscle. D) connective tissue band that joins two bones. E) delicate membrane that covers the surface of the bone.
According to the animation, the reactions that occur between glucose and pyruvic acid
a. are only catabolic. b. are only anabolic. c. are neither catabolic nor anabolic. d. can either be anabolic or catabolic.