Question

The correct structure of DNA components can be presented as:a. phosphate–base–sugar. b. phosphate–sugar–base. c. base–phosphate–sugar. d. phosphate–sugar–phosphate–base. e. base–sugar–phosphate–base.

Answer 1

Answer:

. b. phosphate–sugar–base.

Explanation:

DNA is made up of  Phosphate group

, a Ribose sugar Nitrogenous bases

The  sequence of arrangement is such that there is alternating group of  phosphate and Ribose sugar (forming the backbone)  with the base projecting outwards.  This arrangements is called  polynucleotides. Phosphate groups  bonded with ribose sugar at C5 and C3  by covalent bond (phosphodiester bonds) to give 3' and 5' ends. Nitrogenous bases are bonded directly  by N-glycosidic bond to ribose sugar.

The above  sequence of arrangement  also occur in adjacent polynucleotide but in opposite direction.  Therefore  two strands are held together by hydrogen bonds, between  the bases ;purines and pyrimidine, to form  double strands.They  are arranged in anti parallel position to from  complimentary bases pairs.

Answer 2

DNA is a double-helical nucleotide, which is found in the nucleus of eukaryotic cells. DNA carries the genetic information that is transmitted from parent to daughter cells.

The correct answer is:

Option B.  phosphate–sugar–base

The structure of the DNA can be explained as:

• The DNA is a nucleotide that has a pentose sugar, known as deoxyribose.

• The nitrogenous bases purine and pyrimidine undergo complementary bonding, which results in the helical structure of the DNA.

• The phosphate makes up the backbone of the DNA and provides polarity to the DNA.

Thus, the structure of DNA can be expressed as phosphate - sugar - base.

To know more about DNA, refer to the following link:

https://brainly.com/question/264225