Neurotransmitters are molecules released by ____
a. gonads
b. polar hormones
c. peptide hormones
d. cells in the blood
e. neurons
ANSWER: e
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In mammals, urine drains out of the ____ into a collecting duct
a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle
Transgenic crop plants are primarily developed for which of the following reasons?
a. To improve disease resistance b. To study patterns of inheritance c. To facilitate genetic testing d. To develop new vaccines
The minimum level of organization where a
“division of labor” is seen is the __________ level. a. cellular b. organ c. tissue d. organ system e. body
Which of the following mutagens is MOST likely to cause a frameshift mutation?
A. intercalating agent B. ionizing radiation C. base analog D. alkylating agent E. UV light