The color of a flower is controlled by two alternative alleles at a single locus, R (red) and r (white). If an individual has the Rr alleles, it is considered to be
A) homozygous dominant with a red color.
B) heterozygous with a red color.
C) heterozygous with a white color.
D) homozygous recessive with a white color.
B
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Which of the following statements reflects the first law of thermodynamics?
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products.
Knowing the sequence of a genome is useful in
A. identifying genetic alterations associated with disease. B. studying evolutionary relationships. C. determining protein sequences. D. All of the choices are correct.
Which statement describes a virulent phage?
a. A virulent phage infects viruses. b. A virulent phage infects prions. c. A virulent phage infects virions. d. A virulent phage destroys bacteria. e. A virulent phage infects but does not destroy bacteria.
Select the answer that best completes the following statement: Chemical reactions in living systems occur in an ____________ environment, within a narrow range of temperatures
(a) optimal (b) organic (c) extracellular (d) aqueous