The smallest known DNA virus, ________, has a ________-kilobase ________-stranded genome
a. megavirus / 1.75 / single
b. circovirus / 1.75 / double
c. megavirus / 175 / double
d. circovirus / 1.75 / single
Answer: D
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Which of the following isnot an additional role for nucleosides and nucleotides?
A. primary energy currency of the cell (ATP) B. electron carrier (NAD+) C. methyl group donor (S-adenosylmethionine) D. regulatory molecule (cAMP) E. catalyst for splicing reactions (dUTP)
Why are severe burn patients at extreme risk of infection?
A) The skin is the first and primary barrier to preventing ingress of foreign substances. B) These patients have to stay in a hospital environment for a long time while being exposed to sick people. C) Most immune system cells are destroyed when the skin is damaged. D) The skin helps with the production of vitamin E, a necessary disease-fighting vitamin.
Why do the cells die when the ambient temperature drops to freezing?
a. because of the increased cellular signalling inside the cell b. because of the inhibition of cell division c. because of the inhibition of molecule transport across the cell membrane d. because of the increased metabolic reactions inside the cell
An enzyme that cuts double-stranded DNA at specific nucleotide sequences.
A) RNA polymerase B) DNA ligase C) Restriction enzyme D) Transposase