The pufferfish, Fugu rubripes, has a genome that is one-tenth the size of mammalian genomes. Which of the following statements is not a possible reason for this size difference?
(a) Intron sequences in Fugu are shorter than those in mammals.
(b) Fugu lacks the repetitive DNA found in mammals.
(c) The Fugu genome seems to have lost sequences faster than it has gained sequences over evolutionary time.
(d) Fugu has lost many genes that are part of gene families.
(d)
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The effectiveness of all of the following
methods of contraception is greater than 99% except for
a. the birth control pill. b. hormone implants. c. condoms. d. tubal ligation. e. there are no exceptions- all of these methods are greater than 99% effective
In order to arrive at a solution to a problem, a scientist usually proposes and tests
a. laws. b. theories. c. hypotheses. d. principles. e. facts.
Which cycle involves materials moving through a series of transfers from living to nonliving systems and then back again?
A) biogeochemical B) geological C) continental D) uranium-lead
Carl Woese proposed the concept of the domain based on differences of which of the following cellular molecules?
A) transfer RNA B) membrane lipids C) ribosomal RNA D) DNA E) proteins