Which of the following is NOT one of the body's nonspecific defenses against pathogens?
A) complement system
B) inflammation
C) natural killer cell
D) cytotoxic T cell
E) interferons
Ans: D) cytotoxic T cell
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If life evolved in hydrothermal vents, is it likely the first cells were in the Domain Archaea?
What will be an ideal response?
Fats provide more energy than carbohydrates because they ____
a. are larger molecules b. require more oxidation reactions to breakdown fully c. are hydrophilic d. are liquid e. are partially oxidized initially
The two countries that make up the majority of the world's population are
a. the United States and China. b. China and Japan. c. the United States and India. d. India and Pakistan. e. China and India.
The nerve net of Hydra:a
contains a central control organ and connected neurons. b. sends electrical signals in only one direction. c. allows the organism to respond to stimuli approaching from any direction. d. produces a signal that intensifies as it radiates from its point of origin. e. cannot coordinate the movement of all tentacles at once.