What is the most compelling reason why DNA, rather than RNA, evolved to be the storage repository for genetic information in cellular life forms?
A. DNA molecules are more chemically stable than RNA molecules.
B. DNA has deoxyribose rather than ribose.
C. DNA is double-stranded rather than single-stranded.
Answer: A
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The process in which one or more nucleic acid molecules are rearranged or combined to produce a new nucleotide sequence is called
A. transduction. B. conjugation. C. transformation. D. recombination.
Bone tissue is hard because its matrix contains
a. collagen. b. iron. c. several minerals. d. calcium salts. e. elastic fibers
An evolutionary tree depicts species' relationships based on descent from shared ancestors.
a. true b. false
Why don't sulfa drugs target mammalian cells?
A) Mammalian cells produce inhibitors to the sulfa drugs. B) Mammals make their own folic acid but use a completely different substrate to start the process and therefore sulfa drugs are unable to disrupt the process. C) Mammalian cells do not use folic acid and therefore do not have the enzyme that these drugs target. D) Sulfa drugs do target mammalian cells but the bacteria die so quickly that the patient experiences mild symptoms but can then stop taking the medication before experiencing any serious symptoms. E) Mammals do not make their own folic acid and therefore do not have the enzyme that these drugs target.