Which of the following base pairs is mismatched:
A. adenine; thymine
B. guanine; uracil
C. cytosine; guanine
D. adenine; uracil
guanine; uracil
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One widely used cladistic method of examining evolutionary relationships is ________, which is based on the assumption that evolution is most likely to have proceeded by the path requiring fewest changes
A) topology B) neighbor joining C) parsimony D) systematics
The molecular explanation for narcolepsy is that
A) certain brain cells have many extra orexin/hypocretin receptors, so these cells receive too many messages to sleep. B) the orexin/hypocretin receptor does not reach the cell surfaces of certain brain cells. C) a gene is missing in chromosome 6 that encodes the protein narcoleptin. D) a viral infection activates genes that promote sleep.
Which substance will absorb hydrogen from a solution? a. Base b. Acid c. All of these choices
d. None of these choices. e. Buffer
The tropical rainforest trees form shallow roots concentrated near the surface in a mat few centimeters thick. These
swollen bases or braces are called:a. prop roots. b. pneumatophores. c. aerial roots. d. buttress roots. e. velamen roots.