NEET UG 2015 — Zoology Molecular Basis of Inheritance

2015mcqeasy

Which one of the following is not applicable to RNA?

Official previous-year question

Held on 30 Apr 2015 · Verified 9 Jul 2026.

Options

A
5' phosphoryl and 3' hydroxyl end
B
Heterocyclic nitrogenous bases
C
Chargaff's rule
D
Complementary base pairing

Did you get this right?

Solution

Erwin Chargaff’s rules: Chargaff along with his colleagues, performed base composition studies and put forward certain generalizations for double stranded DNA, called as Chargaff’s rule (Not applicable for single stranded DNA or RNA).

i) Purines and pyrimidines occur in equal amounts.

ii) Purines found in DNA are adenine and guanine. Pyrimidines of DNA are thymine and cytosine.

A + G = T + C

iii) $\frac{A+G}{T+C}=1$ this value is constant for all species.

iv) The base ratio $\frac{A+T}{G+C}=1$ is specific for a species. It is used to identify the species. It is less than one in prokaryotes, e.g., E. coli = 0.92 and more than one in eukaryotes, e.g., Human = 1.52.

v) Sugar deoxyribose and phosphate residues occur in equal number.

vi) Purine adenine is equimolar with pyrimidine thymine.

vii) Purine guanine is equimolar with pyrimidine cytosine.

Your note

NEET UG Molecular Basis of Inheritance in other years

Molecular Basis of Inheritance 2025 Molecular Basis of Inheritance 2024 Molecular Basis of Inheritance 2023 Molecular Basis of Inheritance 2022 Molecular Basis of Inheritance 2021 Molecular Basis of Inheritance 2020 Molecular Basis of Inheritance 2019 Molecular Basis of Inheritance 2018 Molecular Basis of Inheritance 2017 Molecular Basis of Inheritance 2016 Molecular Basis of Inheritance 2014 Molecular Basis of Inheritance 2013

More NEET UG Molecular Basis of Inheritance questions

Which of the following are the post-transcriptional events in an eukaryotic cell? A. Transport of pre-mRNA to cytoplasm prior to splicing. B. Removal of introns and joining of exons. C. Addition of methyl group at 5' end of hnRNA. D. Addition of adenine residues at 3 ' end of hnRNA. E. Base pairing of two complementary RNAs. Choose the correct answer from the options given below :

2025medium

Match List I with List II: $\begin{array}{|l|l|l|l|}\hline & \text{List - I} & & \text{List - II} \\\hline \text{A}. & \text{Alfred Hershey and Martha Chase} & \text{(i)} & \text{Streptococcus pneumoniae} \\\hline \text{B.} & \text{Euchromatin} & \text{(ii)} & \text{Densely packed and dark-stained} \\\hline \text{C.} & \text{Frederick Griffith} & \text{(iii)} & \text{Loosely packed and light-stained} \\\hline \text{D.} & \text{Heterochromatin} & \text{(iv)} & \text{DNA as genetic material confirmation} \\\hline\end{array}$ Choose the correct answer from the options given below:

2025medium

Who proposed that the genetic code for amino acids should be made up of three nucleotides?

2025easy

Which factor is important for termination of transcription?

2025easy

Histones are enriched with -

2025easy

View all Molecular Basis of Inheritance questions