Activated sludge is used in which sewage treatment step?
A. Secondary
B. Tertiary
C. Primary
D. All of these choices are correct.
Answer: A
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When performing gene therapy, DNA can be introduced into human cells by using genetically engineered ____, which
are designed to deliver their genetic material into the cells they infect.
a. sheep cells b. mouse cells c. bacteria d. plasmids e. viruses
Males tend to be affected in greater numbers by X-linked recessive genetic disorders than are females because
A. expression of the recessive gene is inactivated by the other X chromosome in females. B. males have only one X chromosome. C. males have a double dose of the gene. D. Y chromosomes are destabilized by the X chromosomes. E. females have only one X chromosome.
The existence of nest-building in crocodiles and birds led to a prediction that this behavior was also present in
A) ancestral lizards. B) mammals. C) dinosaurs. D) invertebrates.
Transfer of random pieces of DNA mediated by phage is known as
A) transformation of competent cells. B) generalized transduction. C) conjugation. D) transposition. E) specialized transduction.