The biological basis of nicotine addiction is that nicotinic receptors bind
A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings.
B) postsynaptic receptors that normally bind endorphins.
C) the dopaminergic receptor, releasing acetylcholine, which causes the pleasurable feelings.
D) the pleasure center in the brain.
A) nicotine molecules and the neurotransmitter acetylcholine. Binding releases dopamine, which causes pleasurable feelings.
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Plant hormones bind specific cellular receptor molecules that trigger gene expression responses. Which statement is correct concerning these responses?
A. Only cells lacking receptors can bind hormones. B. Only cells in the meristem can respond. C. Only cells that express the appropriate receptors can bind hormones. D. Only cells that have been previously activated can bind hormones. E. None of these choices is correct.
In Mendel's pea plants, the genes that code for flower color, seed color and seed shape are on 3 different chromosomes. For flower color, purple is dominant over white, yellow seeds are dominant over green and round seeds are dominant over wrinkled seeds. If you crossed two parents who were heterozygous for all 3 genes, how many purple flowered, round and yellow seeded plants would you expect in the offspring generation?
a) 9/64 b) 1/64 c) 27/64 d) 3/64
What characteristic(s) separate(s) greater apes from lesser apes
What will be an ideal response?
The envelope of the HIV virus is actually part of the host cell plasma membrane.
Answer the following statement true (T) or false (F)