Errors sometimes occur when DNA duplicates itself. Why might that be a good thing?
a) most errors are, in fact, good for the organism in which they occur
b) the rebuilding process proceeds much more quickly when a few errors occur
c) errors in DNA replication can never be a good thing
d) the DNA replication process becomes more fine-tuned, the more errors it makes
e) new genes can enter the population and be acted upon by evolution
Answer: e) new genes can enter the population and be acted upon by evolution
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The phylogenetic trees of the nifH and SSU rRNA genes are incongruent because
A) nitrogenase is an anaerobic enzyme. B) nitrogenase evolves rapidly. C) of horizontal gene transfer. D) very few microbes have the nifH gene.
Approximately ________ million years ago the amniotes branched off from their amphibian ancestor
a. 300 b. 250 c. 355 d. 180 e. 425
All of the following are examples of prezygotic genetic isolating mechanisms EXCEPT:
a. Male fireflies of different species have different flash patterns. b. Three closely related orchid species flower on different days. c. The progeny of a cross between two different lizard species fail to develop properly. d. One species of snake lives in water and another is terrestrial. e. Peeper frogs mate in April, and tree frogs mate in June.
Which statement about living organisms is NOT correct?
(a). Living organisms create energy. (b). Living organisms maintain homeostasis. (c). Living organisms reproduce. (d). Living organisms have adaptations. (e). Living organisms grow and develop.