Biology Practice Problems Nucleic Acids Practice Problems Solution: Which of the following statements is TRUE?A. Histo...

Solution: Which of the following statements is TRUE?A. Histones are rich in the amino acids D and E, and interact with DNA via ionic bonds.B. RNA is transcribed as a double stranded biopolymer.C. Adenosine functions as a neuromodulator and is inhibited by caffeine.D. Propeller twist increases the area of contact between DNA bases and water.E. DNA double helical structure is stabilized by glycosidic bonds that hold the paire bases together.

Problem

Which of the following statements is TRUE?

A. Histones are rich in the amino acids D and E, and interact with DNA via ionic bonds.

B. RNA is transcribed as a double stranded biopolymer.

C. Adenosine functions as a neuromodulator and is inhibited by caffeine.

D. Propeller twist increases the area of contact between DNA bases and water.

E. DNA double helical structure is stabilized by glycosidic bonds that hold the paire bases together.

Solution

Nucleic acids are polymers of nucleotides: a building block formed from  a nitrogenous base, a pentose, and an inorganic phosphate group. The nitrogenous base can be one of five: adenine (A), cytosine (C), thymine (T), guanine (G), or uracil (U), while the pentose can either be ribose or deoxyribose. RNAs are polynucleotides with ribose as its pentose and A, U, C, and G as its bases, while DNAs have deoxyribose as its pentose and A, T C, and G as its bases. 

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