How are DNA and RNA different?
a. DNA contains the bases A, T, G, and C.
b. RNA contains the bases A, U, G, and C.
c. RNA contains ribose and DNA contains deoxyribose.
d. All of the above. .
d
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A plant stem would be considered to be
a. a shoot system. b. a tissue. c. a root system. d. a meristem. e. an organ.
An increase in the production of ADH affects the kidney tubules by
A. inhibiting reabsorption of sodium ion in the collecting duct. B. decreasing the permeability of the glomerulus to water. C. causing the walls of the collecting duct to become more permeable to water. D. inhibiting the reabsorption of water in the glomerulus. E. decreasing the insertion of aquaporins into the membranes of cells that line the collecting ducts.
Signals that stimulate the release of hormone molecules are carried along the component indicated by the letter ____
a. A b. B c. C d. D e. E
Nondisjunction may result in a person with twenty-three pairs of chromosomes
A. plus an extra chromosome. B. minus a sex chromosome. C. with an extra chromosome number 21. D. All of these answers are true.