During the splicing reaction, the intron-exon junctions are recognized by
A. the branch point.
B. the lariat.
C. snRNPs.
D. SRP RNAs.
E. miRNAs.
Answer: C
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Transcriptional regulation in eukaryotic cells requires the coordinated action of many proteins that interact with one another and with DNA sequences near the gene
A. true B. false
Answer the following statements true (T) or false (F)
1.The pyloric sphincter lies between the small intestine and large intestine, thereby controlling the movement of food into the large intestine. 2.The lining of both the stomach and small intestine is protected from digestive enzymes by a mucus secretion. 3.Acid reflux, or "heartburn," is caused when the gastric juice moves back into the esophagus through the pyloric sphincter. 4.The trace mineral iron is necessary in humans for the transport of oxygen by hemoglobin molecules. 5.If the side effect of a drug was to disrupt homeostasis of vitamin C, leading to its premature breakdown and insufficient concentration, scurvy could result.
The active site of an enzyme
a. is where the coenzyme is located. b. is a specific bulge or protuberance on an enzyme. c. is a groove or crevice in the structure of the enzyme complementary to the substrate. d. will react with only one substrate no matter how many molecules may resemble the shape of the substrate. e. rigidly resists any alteration of its shape
Generally, an atom carries no charge because it has as many electrons as
a. neutrons. b. orbitals. c. shells. d. protons. e. neutrinos.