AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Both DNA and RNA contain a five-carbon sugar. This sugar is
A
ribose in both DNA and RNA.
B
deoxyribose in both DNA and RNA.
C
deoxyribose in DNA and ribose in RNA.
D
deoxyribose in RNA and ribose in DNA.
Explanation: 

Detailed explanation-1: -Ribose and deoxyribose are 5 carbon sugars which are found in RNA and DNA. They have a furanose structure that is a 5 membered ring system with 4 carbon atoms and one oxygen atom.

Detailed explanation-2: -Both DNA and RNA are made of nucleotides and have the same basic structure. Each one contains a 5-carbon sugar, phosphate group, and nucleobases (nitrogenous bases). Once we take a closer look, we can find many very important differences between the two molecules.

Detailed explanation-3: -DNA contains deoxyribose as the sugar component and RNA contains the sugar ribose.

Detailed explanation-4: -deoxyribose, also called d-2-deoxyribose, five-carbon sugar component of DNA (q.v.; deoxyribonucleic acid), where it alternates with phosphate groups to form the “backbone” of the DNA polymer and binds to nitrogenous bases.

Detailed explanation-5: -Sugar. Both DNA and RNA are built with a sugar backbone, but whereas the sugar in DNA is called deoxyribose (left in image), the sugar in RNA is called simply ribose (right in image).

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