Ultraviolet (UV) radiation is an effective microbial control agent because
A) It oxidizes cellular constituents
B) It damages DNA
C) It damages the cell membrane
D) All of the above
Ans: D) All of the above
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Twin studies have been used to assess the relative importance of "nature" versus "nurture" in determining variation among individuals for complex traits. Which of the following statements is not correct?
A. In principle, identical twins differ only because of environment. B. In principle, fraternal twins differ because of genotype and environment. C. Twin studies show that autism and clinical depression are not significantly influenced by genotype. D. The extent to which fraternal twins differ more from each other than identical twins differ from each other measures the effects of genotype. E. Identical twins reared apart compensates for environmental influences that may be stronger for identical twins compared to fraternal twins.
The use of sulfate as a terminal electron acceptor by Desulfovibrio is an example of assimilatory sulfate reduction.
Answer the following statement true (T) or false (F)
Which of the following is a true statement?
A. A cross between Bb and bb genotypes would lead to offspring with a 1:4 phenotypic ratio. B. An example of a homozygous individual is Bb. C. You may associate pedigrees with purebred animals, such as purebred dogs, but pedigrees cannot represent human matings. D. A testcross is a mating between an individual with a dominant phenotype (but unknown genotype) and a homozygous recessive individual.
Which of the following are a reason(s) for the decline in cell numbers during the death phase?
A. Accumulation of toxic waste materials B. Depletion of O2 C. Depletion of nutrients D. All of the choices are correct.