Drug addiction
a. is a form of chemical dependence.
b. may result from habituation and increased
tolerance.
c. may result in deterioration of personal and
professional relationships.
d. may result in risk taking to obtain or use the
drug
e. includes all of these
Answer: e
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The nitrogenous base found in RNA but not DNA is ________
Fill in the blank(s) with correct word
The special dyes used in fluorescence microscopy that absorb light at one wavelength and emit light at a different wavelength are called ________.
Fill in the blank(s) with the appropriate word(s).
In humans and in chimpanzees, 99% of the Alu retrotransposons are in corresponding positions. Which of the following statements below is the most likely explanation for this similarity?
(a) The Alu retrotransposon is not capable of transposition in humans. (b) Most of the Alu sequences in the chimpanzee genome underwent duplication and divergence before humans and chimpanzees diverged. (c) The Alu retrotransposons are in the most beneficial position in the genome for primates. (d) The Alu retrotransposons must also be in the same position in flies.
Which association of structure and function is incorrect?
A. amnion - blood vessels B. chorion - gas exchange C. allantois - waste storage D. yolk sac - food storage