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

Biology & Microbiology

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Most peptic ulcers are caused by

a. antibiotics. b. bacteria. c. heartburn. d. lactose intolerance. e. malnutrition.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology