What is the molecular mechanism for imprinting a gene?
A. Acetylation
B. Nitration
C. Phosphorylation
D. Methylation
D
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The vascular cylinder of a root consists of ________
a. endodermis b. root apical meristem and the root cap c. cortex and pith d. primary xylem and phloem
A deficiency of which essential element leads to intervenal chlorosis?
a. calcium b. potassium c. magnesium d. sulfur
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. While lying dormant the virus is in which of the following states?
a. Lysogenic b. Symptomatic c. Latent d. Replicative e. Infective
The hormone produced by the parathryoid gland produces a rise in the blood level of what product?
A. glucose B. sodium C. calcium D. cholesterol E. phosphate