When differentiation occurs, cells may also change in
_____ genetic content.
_____ size.
_____ shape.
_____ genetic content.
__X__ size.
__X__ shape.
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Molecular clocks are usually calibrated based on
A. guesses about the rates of mutations in a particular gene. B. observed rates of mutation in a particular gene. C. the first shared common ancestor for species known from the fossil record. D. comparing the gene to similar genes in other kingdoms. E. the date when two species diverged from a common ancestor.
he study of past and present distributions of organisms on Earth is termed:a
biodistributogeography. b. organismal geography. c. biogeography. d. geographical ecology. e. biological ecology.
During times of stress, which one of the following glands stimulates the anterior pituitary to release ACTH?
A) hypothalamus B) pancreas C) adrenal medulla D) posterior pituitary E) anterior pituitary
Which of the following is NOT a characteristic of Okazaki fragments?
A) They are checked for accuracy by DNA polymerase III. B) They make up the lagging strand of replicated DNA. C) They begin with an RNA primer. D) They are joined together by DNA ligase. E) They are longer in eukaryotic cells.