Which hormone(s) is/are responsible for sodium reabsorption in the kidneys and intestine?
a. insulin-like hormones
b. glucocorticoids
c. cortisol
d. mineralocorticoids
e. glucagon
ANSWER: d
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Spiny skinned organisms that have a water vascular system belong to the phylum:
a. Echinodermata. b. Chordata. c. Bryozoa. d. Arthropoda. e. Mollusca.
Consider the 4.6-billion-year history of the Earth. Geological and fossil evidence indicates that during the greatest fraction of its history, the Earth
a. was too hot to have either a solid surface or any form of life. b. had organic molecules in liquid water, but no living forms. c. had unicellular organisms, but not multicellular. d. had both multicellular and unicellular organisms, but no terrestrial (land) forms. e. had both terrestrial, freshwater, and marine organisms, both unicellular and multicellular.
Plants store their excess carbohydrates in the
form of
a. cellulose. b. starch. c. glycogen. d. sucrose. e. galactose
Which of the following is an actively dividing tissue in plants?
A. Cambium B. Xylem C. Endodermis D. Phloem E. Pith