Many psychoactive drugs affect the
a. thalamus.
b. pituitary gland.
c. pineal body.
d. hypothalamus.
e. corpora quadrigemina.
D
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Which of the following represents a long-distance signaling mechanism?
A. contact-to-contact signaling B. intercellular signaling C. autocrine signaling D. paracrine signaling E. endocrine signaling
Which of the following contributes to the stability of the DNA double helix?
A) hydrophobic interactions between aromatic bases at the center of the double helix B) hydrogen bonding between the phosphate and sugar groups in the backbone of the double helix C) covalent bonding between complementary purine and pyrimidine bases. D) ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases. E) hydrophobic interactions between aromatic bases at the center of the double helix and ionic bonds between the negatively charged phosphate groups and the positively charged pyrimidine bases
From an evolutionary perspective, true nerve cells are first seen in the phylum:A
Porifera. B. Cnidaria. C. Ctenophora. D. Mollusca. E. Arthropoda
Chloramphenicol binds to the 50S portion of the ribosome which will inhibit
a. transcription in prokaryotic cells b .transcription in eukaryotic cells c. translation in prokaryotic cells d. translation in eukaryotic cells