What is the molecule shown below called? A) glycosaccharide B) nucleotide C) nuc

Question

What is the molecule shown below called? A) glycosaccharide B) nucleotide C) nucleoside D) nitrogenous base E) pentose Which of the following statements is false? A) DNA contains phosphodiester linkages. B) RNA contains phosphodiester linkages. C) RNA backbone is more stable than DNA backbone. D) DNA is a linear polymer. E) We read RNA sequence from 5' to 3'. The temperature at which half of the DNA helical character is lost is referred to as ____. A) T_h B) T_m C) T_0.5 D) T_DNA E) None of the above. The chemical forces that contribute to the stability of the DNA due to the base stacking present in the DNA helix are ____. A) hydrogen bonds B) van der Waals interaction C) disulfide bonds D) hydrogen bonds and van der Waals interaction E) van der Waals interaction and disulfide bonds

Explanation / Answer

33) C : Nucleoside.

Combination of a sugar with a base is called nucleoside.

34) C:

DNA contains deoxyribose, RNA contains ribose (in deoxyribose there is no hydroxyl group attached to the pentose ring in the 2' position). These hydroxyl groups make RNA less stable than DNA because it is more prone to hydrolysis.

35) B : Tm

36) B : Van der Waals interaction

Stacking interactions also known as Van der Waals interactions between bases are weak, but the large amounts of these interactions help to stabilize the overall structure of the helix.

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