Mosses have ____
a. xylem
b. lignin
c. true stems
d. rhizoids
e. independent sporophytes
ANSWER: d
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Which of the following is NOT associated with leaf abscission?
A. development of suberin impregnated cork cells B. cell wall development C. development of a separation layer D. water stress E. deciduous trees
The emergency treatment for anaphylactic shock is an injection of
a. glucose. b. epinephrine. c. serotonin. d. dopamine. e. histamine.
Amniocentesis involves
A) prenatal diagnosis of genetic defects in a fetus. B) tests for enzyme and protein deficiencies in a fetus. C) taking a sample of amniotic fluid with a needle. D) analysis for DNA and chromosome defects in a fetus. E) All of these
To conserve precious salts, freshwater fish
A) drink large amounts of water and produce small amounts of urine. B) drink almost no water and produce large amounts of dilute urine. C) excrete salt ions and small amounts of urine. D) consume salt ions in food and eliminate water by osmosis.