Which reaction does the enzyme phosphoglucose isomerase catalyze?
(a) glucose -> glucose 6-phosphate
(b) fructose 6-phosphate -> fructose 1,6-bisphosphate
(c) glucose 6-phosphate -> fructose 6-phosphate
(d) glucose -> glucose 1-phosphate
Choice (c) is the correct answer. The isomerase part of the enzyme name indicates that it catalyzes an isomerization reaction, and the phosphoglucose part of the name indicates the type of substrate used. The enzymes that catalyzed reactions (a), (b), and (d) would be called kinases, because they transfer phosphate groups from one molecule to another.
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The female reproductive tract of some Drosophila species blocks sperm of another species from reaching her eggs
This is an example of ____.
a. gametic isolation b. hybrid breakdown c. hybrid inviability d. mechanical isolation e. temporal isolation
Lactose is
a. a disaccharide. b. an energy source for plants. c. a polysaccharide. d. also known as table sugar. e. a form of starch.
Which structures are homologous to testes in human females?
a. Cowper’s gland b. prostate c. ovaries d. greater vestibular glands
Which of the following groups of animals is most efficient at extracting oxygen from the atmosphere?
A) Reptiles B) Amphibians C) Birds D) Mammals E) Insects