All the following are DNA viruses except
A) Picornaviridae.
B) Hepadnaviridae.
C) Papillomaviridae.
D) Herpeseviridae.
E) Adenoviridae.
Answer: A
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Which of the following is not true of RNA synthesis by RNA polymerase?
A. RNA synthesis is less processive during elongation than during initiation. B. Synthesis begins with the polymerase binding two rNTP molecules. C. The polymerase frequently releases the nascent transcript before it reaches 8–10 nucleotides in length. D. The addition of an rNTP to a growing transcript is a magnesium ion-dependent reaction. E. All of the choices given are true.
Although extinction is a natural process and is ongoing, it is likely we are in a time of ____, an event in which many
different kinds of organisms become extinct in a relatively short period.
a. mass extinction b. genetic mutation c. geologic catastrophe d. loss of megafauna e. birth of new species
Heterozygotes for the Tay-Sachs disease allele appear to have greater than normal resistance to
_____________________, which supports the theory that _____________________ explains why this harmful allele persists in the gene pool. Fill in the blank(s) with the appropriate word(s).
Which of the following statements about the humoral immune response is true?
A) The humoral immune response defends against bacteria and viruses by activating T cells. B) The humoral immune response defends primarily against bacteria and viruses present in body fluids. C) The humoral immune response plays a major role in protecting the body from cancerous cells. D) The humoral immune response is the result of macrophages producing antibodies.