The function of the sphincter between the stomach and small intestine is to
A) retain chyme in the stomach until pepsin digestion is complete.
B) periodically release chyme into the small intestine in squirts.
C) release bile into the duodenum when chyme is present.
D) release pancreatic secretions into the duodenum when chyme is present.
Answer: B
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The relative location of genes on a chromosome as determined by recombination frequencies is illustrated in a ________ map.
A. physical B. chromosomal C. genetic D. DNA
Which one of the following statements about RNA processing is true?
A) Exons are cut out before mRNA leaves the nucleus. B) Ribozymes may function in RNA splicing. C) RNA splicing can be catalyzed by tRNA. D) A primary transcript is often much shorter than the final RNA molecule that leaves the nucleus.
Where are the long tandem clusters of highly repeated simple sequences, or satellite DNA, located in chromosomes?
What will be an ideal response?
Each FADH2 that enters the electron transport system gives rise to _____ ATP.
A. 2 B. 3 C. 24 D. 36 E. 38