Crossing over occurs between the ________
a. nonsister chromatids of a pair of homologous chromosomes
b. sister chromatids of a pair of homologous chromosomes
c. nonsister chromatids of a pair of non-homologous chromosomes
d. sister chromatids of a pair of non-homologous chromosomes
a
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Which of the following structural features is common to cellulose, chitin, and peptidoglycan?
A) They are all composed of glucose in either the ? or ? form. B) They all contain peptide bonds. C) They can all form bonds between polymer chains that create parallel strands. D) They are all composed of highly branched fibers.
Humans have disrupted the nitrogen cycle primarily by
a. irrigation. b. cutting down forests. c. using nitrogen-containing fertilizers. d. crop rotation. e. leaching.
The modern evolutionary synthesis of the 1930s and 1940s melded together Darwin's findings with ________.
A. chemistry B. psychology C. genetics D. sociology
In the experiment with peacock butterflies, the working hypothesis is that _____.
A. silence confuses both predator and prey B. making sounds can provide a selective advantage to the prey C. eye spots attract the attention of predators. D. birds can find their prey by listening for their sounds E. unpalatable species display distinctive wings