AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

STRUCTURE OF NUCLEIC ACIDS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many carbon atoms are there in a ribose and a deoxyribose sugar molecule?
A
Six
B
Five
C
Three
D
Eight
Explanation: 

Detailed explanation-1: -Pentose sugar for RNA is ribose with 5 carbon atoms. Pentose sugar for DNA is deoxyribose.

Detailed explanation-2: -The 5-carbon sugars ribose and deoxyribose are important components of nucleotides, and are found in RNA and DNA, respectively. The sugars found in nucleic acids are pentose sugars; a pentose sugar has five carbon atoms.

Detailed explanation-3: -Both deoxyribose and ribose belongs to a class of sugars called Pentoses. Pentose sugar contains five carbon sugar molecule.

Detailed explanation-4: -Ribose is a single-ring pentose [5-Carbon] sugar. The numbering of the carbon atoms runs clockwise, following organic chemistry rules.

Detailed explanation-5: -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.

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