Although the specific mechanism of RNA interference has not been fully defined, it involves
A. double-stranded RNA interference with DNA.
B. double-stranded mRNA interference with DNA.
C. double-stranded RNA interference with mRNA.
D. double-stranded DNA interference with mRNA.
Answer: C
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Which of the following is a primary lymphoid organ?
A. tonsils B. spleen C. lymph node D. bone marrow E. circulatory system
Which of the following cases is not an example of classical conditioning?
A. Giving a hunting dog an electric shock when it does not return to the owner's side on command. B. Advertisers using an attractive model to sell their line of clothing. C. A baby crying when her diaper is wet and the parent picking her up. D. All of the answer choices are examples of classical conditioning. E. None of the answer choices are examples of classical conditioning.
Nitrification and denitrification differ in that ________.
A. nitrification oxidizes ammonia into a still-usable form, whereas denitrification oxidizes a usable form of nitrogen into unusable nitrogen gas B. nitrification adds a nitrogen atom to an organic compound, whereas denitrification removes a nitrogen atom from an organic compound C. nitrification produces ammonia whereas denitrification produces the nitrite ion D. nitrification oxidizes the nitrate ion into unusable nitrogen gas, whereas denitrification oxidizes ammonia into the nitrite ion
Adam experiments with Anole lizards that can change color, depending on their environment. Adam places a green anole lizard on a brown background and a brown anole lizard on a green background. Adam knows that the brown lizard should turn green and the green lizard should turn brown, but neither of the lizards changed color. What may have caused Adam's results?
a. Their color changing may be affected by something else besides the background color, such as fear or temperature. b. They may have to move to the new background on their own rather than being placed there. c. They may need more time in which to change color. d. The colors of the background may not have been appropriate for these lizards.