The observation that freshwater habitats account for only 1% of Earth's water, and they are home to 36% of the known species of fish is due to speciation.
A. parapatric
B. prezygotic
C. sympatric
D. postzygotic
E. allopatric
C. sympatric
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L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?
A. Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form. B. Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form. C. Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes. D. Enzymes can only recognize a single, specific stereoisomer.
Which of the following word parts does not mean seizure?
A. ict/o- B. clon/o- C. convuls/o-
Which one of the following properties of water is primarily responsible for the ability of trees to draw water up from the roots to the leaves?
A. polarity B. density C. solvent capability D. high surface tension E. pH neutrality
Glycogen is the storage form of glucose in muscle and liver cells.
a. true b. false