NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

BIO MOLECULES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many carbons form the sugar in the backbone?
A
3
B
4
C
5
D
6
Explanation: 

Detailed explanation-1: -Each nucleotide consists of a phosphate group, a nitrogenous base-adenine (A), thymine (T), cytosine (C), or guanine (G)-and deoxyribose. DNA’s sugar, deoxyribose, has five carbon atoms, which are connected to each other to form what looks like a ring. Four carbons plus an oxygen are part of the five-sided ring.

Detailed explanation-2: -Deoxyribose is a five-carbon sugar found in DNA. It is the nucleotide’s central molecule. Thus, Deoxyribose is the five-carbon sugar found in DNA.

Detailed explanation-3: -ribose, also called D-ribose, five-carbon sugar found in RNA (ribonucleic acid), where it alternates with phosphate groups to form the “backbone” of the RNA polymer and binds to nitrogenous bases.

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 Structure Deoxyribose is known as an aldopentose, because it is a five-carbon molecule that contains a carbonyl group at the end of the molecule. In the above image, it is seen as deoxyribofuranose, or as a five membered ring.

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