Which of the following is not associated with the stomach?
A. pepsin
B. duodenum
C. alcohol absorption
D. gastric glands
E. rugae
Answer: B
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Which is true about prions?
A. They cause a degenerative brain condition. B. They are naked pieces of RNA. C. They are made of DNA and protein. D. They are a normal brain protein that has folded differently. E. They cause a degenerative brain condition AND they are a normal brain protein that has folded differently.
The hormone progesterone triggers the smooth muscles of the uterine wall to begin the contractions of labor
a. True b. False
Researchers are developing a ribozyme that cleaves the HIV genome. This pharmaceutical agent could be described as
A) an RNA molecule capable of catalysis. B) a hydrolase. C) a genetic transposable element. D) a protease inhibitor. E) a competitive inhibitor for reverse transcriptase.
The human genome codes for 20,000 to 25,000 proteins, but any given cell might produce only 5,000 different proteins. How is this possible?
A) Not every cell has the machinery for transcription and translation. B) Genes are regulated so that not all genes are transcribed in all cells. C) Every cell contains a different fraction of the genome. D) All possible proteins are made in all cells, but those that are not needed are degraded. E) Some cells use introns to produce proteins, and some cells use exons.