Which of the following is the most common type of hydrolysis damage in the cell?
A. deamination of thymidine
B. breakage of the glycosidic linkage between the pyrimidines and the DNA backbone
C. removal of cytosine from the DNA backbone to create an abasic site
D. deamination of cytosine to uracil
E. None of the damage types given is known to occur in cells.
D
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Which of the following is not an example of facilitated diffusion?
A) GLUT1 glucose transporter B) anion exchange protein C) aquaporins D) channel proteins E) oxygen transport
The brains of patients with Alzheimer’s disease have a reduced level of
1.serotonin. 2.dopamine. 3.acetylcholine. 4.aspartic acid. 5.GABA.
Incubation of cells at 20°C blocks the release of proteins from the trans-Golgi. Under such conditions, you would expect to see
A. an increase in exocytosis. B. an increase in endocytosis. C. a decrease in endocytosis. D. a decrease in exocytosis.
Which of the following is the best unit for expressing the size of an average bacterial cell?
A. Nanometer B. Centimeter C. Millimeter D. Micrometer