To which Phylum do humans belong?
a. Animalia
b. Chordata
c. Vertebrata
d. Mammalia
e. Homo sapiens
Answer: b. Chordata
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Which one of the following is the portion of the forebrain that regulates the endocrine system and body temperature?
A. cerebrum B. thalamus C. limbic system D. hypothalamus
What extracellular plant signaling molecules can exert their effects at very low concentrations?
a. hormones b. peptide c. enzymes d. pheromones e. plasmodesmata
A drug called Coumadin interferes with the action of vitamin K in the liver. What effect will Coumadin have on blood-clotting mechanisms?
A) Coumadin will make it necessary for the patient to eat extra leafy green vegetables. B) Vitamin K will not be absorbed from the digestive tract. C) The liver will not be able to produce needed clotting factors. D) Nothing, because vitamin K is not necessary for blood clotting.
How long ago did Australopithecus afarensis live?
A) 50,000—100,000 years ago B) about 2.2 million years ago C) 500,000 years ago D) about 3.2 million years ago