Which of the following are vestigial structures?
A) Wings of bats
B) Fish fins
C) Hoofs of horses
D) Pelvic bones of whales
E) Vertebral columns in snakes
D
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Fungal cell walls are composed of what material?
A. Chitin B. Cellulose C. Peptidoglycan D. Lignin E. Glycogen
The vector for Rocky Mountain spotted fever is the ________.
A. mosquito B. tick C. flea D. louse
Drugs designed to fight HIV work by
a. preventing binding of HIV to host cell. b. slowing reverse transcription. c. preventing integration of viral DNA. d. preventing viral protein production. e. all of these.
The sense of pain is one of the most important of all the senses. Nociception is critical to survival because
A. pain triggers behavioral responses that protect from further danger. B. the activation or inhibition of enzymes are triggered by nociceptors in the brain. C. signals from nociceptors trigger memories and emotions associated with pain. D. signals from nociceptors tell an animal whether it has been injured and increase alertness and arousal.