Histones bond to DNA by ____ of DNA
a. an ionic attraction to the phosphate groups
b. hydrogen bonding to the deoxyribose sugars
c. an ionic attraction to the nitrogenous bases
d. hydrogen bonding with the nitrogenous bases
e. covalent bonds to the deoxyribose sugars
A
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The four organic molecules found in all living systems are carbohydrates, nucleic acids, lipids, and ________
Fill in the blank(s) with correct word
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A) 1,500,000 years B) 1,000,000 years C) 500,000 years D) 250,000 years
Which of the following lymphoid organs filters and purifies lymph fluid?
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