Urine moves from the urinary bladder to the external environment through the ____
a. renal artery
b. renal vein
c. urethra
d. nephron
e. ureter
ANSWER: c
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If there is variation in a given character within a population, selection may be unable to act on that character if:
a. the genes involved have effects on other characters that are also under selection. b. there is gene flow into that population. c. the population is peripheral to a larger population that faces different selective conditions. d. All of the above. e. None of the above.
A common method for cultivating viruses in the lab is to use in vitro systems called ________ cultures.
A. plaque B. embryo C. bacteriophage D. cell E. egg
The most commonly used practical form of energy used in cells is adenosine diphosphate.
Answer the following statement true (T) or false (F)
Which of the following statements is true?
a. Mosses have xylem b. Mosses have lignin. c. Mosses have true stems. d. Mosses have rhizoids. e. Mosses have independent sporophytes