Breeding a yellow dog with a brown dog produced puppies with both yellow and brown hairs
intermixed. This is an example of:
a. variegation.
b. codominance.
c. incomplete dominance.
d. epistasis.
e. a polygenic trait.
B
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Which of the following is true of the topoisomerases found in bacteria?
A. Type I topoisomerases introduce single-stranded breaks and as a result change the linking number by 1. B. Type I topoisomerases introduce single-stranded breaks and as a result change the linking number by 2. C. Type II topoisomerases introduce single-stranded breaks and as a result change the linking number by 2. D. Type II topoisomerases introduce double-stranded breaks and as a result change the linking number by 1. E. Type I topoisomerases are the only category that can introduce negative supercoils.
In meiosis chromosomes containing sister chromatids (not homologous chromosomes) align along the center of the cell during
A. prophase I. B. prophase II. C. interphase II. D. metaphase I. E. metaphase II.
Which of the following systems is the only one to have direct interactions with the other three?
a. digestive b. urinary c. circulatory d. respiratory e. reproductive
Plant roots absorb nitrate or ammonia and incorporate these compounds into plant proteins via the process of:
a. ammonification. b. denitrification. c. assimilation. d. nitrogen fixation. e. nitrification.