The source of life's diversity originates from differences in ________ .
a. DNA molecules
b. sulfur backbones
c. carbohydrate reservoirs
d. lipid molecules
e. cell wall structure
a. DNA molecules
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Most peptic ulcers are caused by
a. antibiotics. b. bacteria. c. heartburn. d. lactose intolerance. e. malnutrition.
Arrange the following going from the earliest to the most recent according to the time they evolved from a common
ancestor. 1) New World monkeys 2) Orangutans 3) Humans 4) Gibbons 5) Gorillas a. 1, 4, 2, 5, 3 b. 1, 2, 4, 3, 5 c. 2, 1, 4, 5, 3 d. 2, 5, 4, 1, 3 e. 3, 5, 2, 4, 1
The primers in PCR are ____.
A. fragments of mRNA B. designed to base pair with mRNA C. free nucleotides D. radioactive E. needed to initiate the reaction
How are X rays used in the technique of X-ray diffraction?
A) The scattering of X rays by a purified form of a molecule reveals its structure. B) Cells are broken open to release chromosomes by being bombarded with X rays. C) DNA strands are separated by X-ray energy, revealing the order of bases. D) The X rays are used to mutate DNA to determine the location of genes. E) Enzymes are destroyed by X rays, revealing the order of steps in metabolism.