NURSING ANM AND GNM

NURSING EXAM QUESTIONS

BIOCHEMISTRY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What are the “backbones” of the DNA molecule made up of?
A
phosphate/sugar
B
hydrogen bond
C
A/T/C/G
D
covalent bond
Explanation: 

Detailed explanation-1: -DNA consists of two strands that wind around each other like a twisted ladder. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups. Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T).

Detailed explanation-2: -The sugar-phosphate backbone of DNA is a strand of repeating ribose sugar and phosphate compounds bonded together. They form the backbone because the bases that make up the genetic information of DNA are bonded to this backbone.

Detailed explanation-3: -The deoxyribonucleotides are made up of phosphoric acid and deoxyribonucleosides. The deoxyribonucleosides are made up of deoxyribose sugars and nitrogenous bases. The deoxyribonucleotides are joined to each other with the help of 3’, 5’ phosphodiester bonds forming the backbone of single DNA chain.

Detailed explanation-4: -The backbone of the DNA is composed of deoxyribose sugar and a phosphate molecule. The four types of nitrogen bases present in a nucleotide are adenine (A), thymine (T), guanine (G), and cytosine (C).

Detailed explanation-5: -The DNA strand’s “backbone” is constituted by pentose sugar and phosphate, while the nitrogenous bases project inside forming the bridges between the strands.

There is 1 question to complete.