A: The DNA molecule consists of two polynucle | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) Assertion $(A)$ is true because $DNA$ is a double-stranded helix where the two polynucleotide chains run in opposite directions ($5' \rightarrow 3

Vedclass · Accepted Answer

$A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.

Vedclass · Answer

(B) Assertion $(A)$ is true because $DNA$ is a double-stranded helix where the two polynucleotide chains run in opposite directions ($5' \rightarrow 3'$ and $3' \rightarrow 5'$),which is known as an antiparallel orientation.Reason $(R)$ is also true as the double-helix model of $DNA$ was indeed proposed by James $Watson$ and Francis $Crick$ in $1953$.However,the fact that $Watson$ and $Crick$ proposed the model is a historical fact and does not explain why the chains are antiparallel (which is due to the chemical structure of the deoxyribose sugar and the phosphate backbone). Therefore,$R$ is not the correct explanation of $A$.

$A$: The $DNA$ molecule consists of two polynucleotide chains that run antiparallel to each other.
$R$: The $DNA$ molecular model was proposed by scientists $Watson$ and $Crick$.

Similar Questions

The length of one full turn of $B-DNA$ is ....... (in $nm$)

What is the length of $DNA$ present in a nucleosome (in $, nm$)?

The length of $DNA$ in $E. coli$ is:

The given diagram represents:

The $DNA$ molecule has a uniform diameter due to which of the following?

Vedclass Test Series

Exam Paper Generator

Online Exam Module

$A$: The $DNA$ molecule consists of two polynucleotide chains that run antiparallel to each other.$R$: The $DNA$ molecular model was proposed by scientists $Watson$ and $Crick$.