Histones and DNA have a strong attraction for each other because
A) DNA is positively charged and histones are negatively charged.
B) both DNA and proteins are hydrophobic.
C) DNA is negatively charged and histones are positively charged.
D) like substances share common charges.
C) DNA is negatively charged and histones are positively charged.
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An elevated IgM titer typically indicates an active infection while an elevated IgG titer does not distinguish between active and past infections.
Answer the following statement true (T) or false (F)
What types of cells produce antibodies?
a. T helper cells b. cytotoxic T cells c. plasma cells d. memory B cells
A deficiency of which nutrient will interfere with the proper development of the neural tube?
a. vitamin A b. vitamin D c. vitamin C d. vitamin B12 e. folic acid
When light energy hits a photopigment, the molecule
A) is separated from the plasma membrane. B) is destroyed, setting off a series of chemical reactions. C) forms an enzyme. D) changes shape, setting off a series of chemical reactions. E) generates an action potential.