The main producers for the human food chain are ____
a. farmers
b. light
c. plants
d. cows
e. methane
ANSWER: c
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The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration reactions?
A) C60H120O60 B) C6H12O6 C) C60H102O51 D) C60H100O50 E) C60H111O51
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.
Although there are fewer than 14,000 living species of seedless vascular plants, they were the
dominant plants on Earth for nearly 200 million years. Their dominance ended at the end of the Carboniferous period, about
a. 1.5 billion years ago. b. 420 million years ago. c. 250 million years ago. d. 125 million years ago. e. 17 million years ago.
Four of the five answers listed below are related by the same function. Select the exception
a. blood plasma b. carbaminohemoglobin c. oxyhemoglobin d. carbonic acid e. bicarbonate ions