_____ are inorganic substances with metabolic roles that no other substance can fulfill
a. Fats c. Vitamins
b. Minerals d. Simple sugars
B
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One type of polyploidy is ____
a. aneuploidy b. trisomy c. triploidy d. deletion e. translocation
In the tryptophan operon, the repressor actively binds to the operator when:a
tryptophan binds to an allosteric site on the repressor. b. tryptophan levels are low. c. lactose levels are low. d. there is a great need for proteins. e. allotryptophan levels are low.
The direction of cellulose microfibril synthesis in elongating plant cells is
a. parallel to the direction of cell elongation. b. perpendicular to the direction of cell elongation. c. perpendicular to the direction of microtubules under the plasma membrane. d. parallel to the endoplasmic reticulum under the plasma membrane. e. both b and d
Which nutrient, when metabolized for energy, produces nitrogenous wastes?
A. vitamins B. minerals C. amino acids D. lipids E. carbohydrates