What is the role of the sliding clamp during replication?
A. It unwinds the double helix at the replication fork to allow DNA polymerase to progress along the DNA.
B. It hydrolyzes ATP to push the DNA polymerase along the DNA template.
C. It keeps DNA polymerase attached to the template while the polymerase synthesizes a new strand of DNA.
D. It loads DNA helicase onto the replication fork.
E. It keeps the RNA primer attached to the lagging strand.
Ans: C. It keeps DNA polymerase attached to the template while the polymerase synthesizes a new strand of DNA.
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Chemicals called un-couplers can make membranes permeable to small molecules and ions. What effect might un-couplers have on photosynthesis?
A. Increased ATP production because cyclic electron transport would increase B. Decreased ATP production because the proton-gradient would increase C. Decreased ATP production because the proton-gradient would decrease D. Decreased NADPH production because the proton-gradient would increase E. Decreased NADPH production because the proton-gradient would decrease
Only nine types of aneuploids are known in newborns because
A) only nine chromosomes undergo nondisjunction. B) most types of aneuploids are lethal early in development. C) most aneuploids do not cause detectable defects. D) most aneuploids do not affect the phenotype.
__________ sense and respond to water concentration. Fill in the blank(s) with the appropriate word(s)
When fungal populations in soils are reduced as the result of contamination by copper, one consequence is:
A) reduced decomposition of organic matter. B) substantial change in soil texture. C) substantial change in soil color. D) accumulation of fungal toxins. E) all of the above