Mobile genetic elements, such as transposons and retrotransposons, are significant because:a
the entire human genome is composed of transposons.
b. they are present in the human genome, but not in the genomes of other organisms.
c. mutations caused by retrotransposons contribute greatly to a species’ evolution.
d. transposons are the only mechanisms of genetic diversity.
e. only corn contain transposons
c
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Which of the following statements is NOT true of lophophorates?
A. Their tentacles serve both in respiration and in feeding. B. They have a U-shaped digestive tract. C. They have a true coelom. D. There are three phyla of them: Phoronida, Bryozoa, Brachiopoda. E. They are parthenogenetic.
Much of the work of breaking down the food we ingest is done by our
(a) stomach (b) teeth (c) gut microbiome (d) esophagus
The function of the epiglottis is to
A) keep the bronchi from collapsing. B) produce surfactant. C) assist the vocal cords in sound production. D) facilitate gas exchange in the lungs. E) prevent food from entering the larynx.
If similarities between two structures in different organisms reflect common ancestry, these structures are
A. Vestigial B. Analogous C. Homeotic D. Heterozygous E. Homologous