Oxygen will diffuse across gill membranes into
the blood because
a. oxygen is in higher concentration in the
blood compared to the water.
b. oxygen is in lower concentration in the
water compared to the blood.
c. oxygen is in higher concentration in the
water than in the blood.
d. oxygen is in equal concentration in both the
blood and the water.
e. of none of these
C
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Possessing the entire sequence of a particular human genome may not be as useful as we think. Why not?
A. Every human genome is different enough that knowing ONE human's DNA sequence can't tell us almost anything about ALL humans. B. It's not the DNA sequence that matters-we need to know the mRNA sequence of the human genome. C. Due to the presence of introns/exons, and splicing of RNA after transcription, the DNA sequence doesn't necessarily tell us the exact number/type of proteins that will eventually be made from it. D. The amount of "junk DNA" present in the human genome masks any useful genetic information that we'd like to obtain.
The fourteen species of finches native to the Galápagos Islands ____, and therefore illustrate adaptive radiation
a. diverged following a mass extinction event b. evolved from a single common ancestor c. migrated independently from South America d. represent a convergent evolutionary process e. evolved from numerous distant ancestors
In the mammalian digestive system, what is the primary site of nutrient absorption?
A. large intestine B. pharynx C. stomach D. pancreas E. small intestine
Energized myosin heads bind to actin only when
__________ is present. a. ATP b. ADP c. calcium d. phosphorus e. sodium