The class of neurotransmitters that most commonly acts as a modulator of postsynaptic cell response are the
A. gases such as nitric oxide.
B. acetylcholine.
C. neuropeptides.
D. amino acids.
E. biogenic amines.
Answer: C
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In general, when cytosine bases in CpG islands are methylated:
A. transcription is active and rapid. B. transcription is active, but slow. C. transcription is repressed. D. translation is active and rapid. E. translation is repressed.
_______ bind ferric iron and transport it into a bacterial cell.
Fill in the blank(s) with the appropriate word(s).
The primary muscle(s) involved in human breathing is/are the ____
a. external intercostals
b. internal intercostals c. diaphragm d. abdominal wall e. lung
You are hiking in a forest and come upon a mysterious plant, which you determine is either a lycophyte sporophyte or a pterophyte sporophyte. Which of the following would be most helpful in determining the correct classification of the plant?
A) whether or not it has true leaves B) whether it has microphylls or megaphylls C) whether or not it has seeds D) its height