In aquatic ecosystems, primary productivity is most dependent on
A) species richness and diversity
B) the type of soil
C) the rate of photosynthesis
D) organic nutrients
E) inorganic nutrients
Ans: E) inorganic nutrients
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Match the reactant in gluconeogenesis on the left with the appropriate enzyme on the right.
A) hexokinase B) phosphoenolpyruvate carboxykinase C) oxaloacetate kinase D) aldolase E) pyruvate carboxylase F) pyruvate kinase G) phosphoglyceromutase H) fructose-1,6-bisphosphatase I) glucose-6-phosphatase 1 pyruvate 2. oxaloacetate 3. fructose-1,6-bisphosphate 4. glucose-6-phosphate 5. 2-phosphoglycerate
A sensory system includes
a. a sensory receptor. b. nerve pathways from the receptor to the brain. c. brain regions where the sensory information is processed. d. a sensory receptor and nerve pathways from the receptor to the brain, only. e. a sensory receptor, nerve pathways from the receptor to the brain, and brain regions where the sensory information is processed
An IS (insertion sequence) element contains
A) a transposase gene only. B) a transposase gene and additional genes. C) a transposase gene and inverted repeats at the ends. D) a transposase gene, additional genes, and inverted repeats at the ends. E) genes but not a transposase gene.
Why do many antiviral drugs resemble nucleotides?
a. because they inhibit DNA ligase b. because they are easily obtained c. because they inhibit DNA polymerase d. because they are isolated from plants