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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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
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.
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.
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.