When a nipple is placed in a newborn baby's mouth, the infant will immediately begin to suckle. This is an example of
A) imprinted behavior.
B) classical conditioning.
C) innate behavior.
D) imitation.
Answer: C
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The skin is an example of which part of the immune system?
a. adaptive b. innate c. cell-mediated d. humoral
The ratio of ________ in DNA is 1:1.
A) guanine to adenine B) adenine to thymine C) cytosine to adenine D) uracil to cytosine
AIDS has become a more manageable illness in developed countries in recent years due to:
A) general resistance in the human population. B) declining disease rates in most areas of the world. C) medications that keep HIV from copying itself. D) vaccines. E) changes in the viral genome.
In a metabolic pathway, substrate Z is broken down to form products Y and X. Y is further broken down into products V and W. How many enzymes are required for this metabolic pathway?
A. three B. two C. four D. one E. five