Blog Log in Get Started Free

NEET Practice Questions (MCQs) with Answers & Solutions

Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

● ● ● ● ●

DNA replication in eukaryotes differs from replication in bacteria because:

Synthesis of the new DNA strand is from 3' to 5' in eukaryotes and from 5' to 3' in bacteria

Synthesis of the new DNA strand is from 5' to 3' in eukaryotes and from 3' to 5' in bacteria

There are many replication forks in each eukaryotic chromosome and only one in bacterial DNA

Synthesis of the new DNA strand is from 5' to 3' in eukaryotes and is random in prokaryotes

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

In prokaryotes, DNA molecules contain a single origin of replication and a single replicon. These origin sites are longer than eukaryotic origin sites.

Eukaryotic DNA is very large and is organised into chromosomes. There are multiple origins of replication on each chromosome. DNA replication can independently initiate at each origin and terminate at corresponding termination sites.

● ● ● ● ●

You have analyzed the DNA isolated from a newly discovered virus and found that its base composition is 32% A, 17% C, 32% G, and 19% T. What would be a reasonable explanation of this observation?

The virus must be extraterrestrial

In some viruses, double-stranded DNA is made up of base pairs containing two purines or two pyrimidines

Some of the T was converted to C during the isolation procedure

The genome of the phage is single-stranded not double-stranded

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

As the % of A is not equal (or approx) to T and that of G is not equal to C, thus the genome of the virus is single stranded.

● ● ● ● ●

The energy necessary for making a DNA molecule comes directly from the:

Sugar

ATP

Release of phosphates

NADPH

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The energy for making DNA comes from release of pyrophosphate (PPi).

dNTPs are the building blocks of DNA. When polymerase enzyme incorporates dNTP, it breaks bond between alpha and beta phosphate and energy is released.

● ● ● ● ●

The force that holds DNA together in a double helix is:

The force of the twist

Covalent bonds

Ionic bonds or ionic interactions

Hydrogen bonds

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The bases in two strands are paired through hydrogen bonds forming base pairs.

Adenine forms two hydrogen bonds with Thymine from opposite strand and vice-versa.

Similarly, Guanine is bonded with Cytosine with three H-bonds.

As a result, always a purine comes opposite to a pyrimidine. This generates approximately uniform distance between the two strands of the helix

(page-97)

● ● ● ● ●

If Hershey and Chase had found 'S in both the pellet and the supernatant, the conclusion about the nature of DNA replication would be that:

Protein must be the information molecule

It would be difficult to conclude anything from these results

DNA is the genetic information molecule

Phage must have stuck to the bacteria

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The information provided in the question is incomplete as we cannot infer anything from presence of Sulphur in pellet and supernatant.

If it would have been Phosphorus, then we could say that genetic material has transferred.

● ● ● ● ●

Experiments by Avery, Macleod, and McCarty supported DNA as the genetic material by showing that:

Both protein and DNA samples provided the transforming factor

DNA was not complex enough to be the genetic material

Only samples with DNA provided transforming activity

Even though DNA was molecularly simple, it provided adequate variation to act as the genetic material

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Avery, Macleod and McCarty purified biochemicals (proteins, DNA, RNA, etc.) from the heat-killed S cells to see which ones could transform live R cells into S cells. They discovered that DNA alone from S bacteria caused R bacteria to become transformed.

They concluded that DNA is the hereditary material.

(page-101)

● ● ● ● ●

What are the mini-satellites?

r-DNA

VNTR

c-DNA

SAT

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

The VNTR belongs to a class of satellite DNA referred to as mini-satellite. A small DNA sequence is arranged tandemly in many copy numbers.

(page-122)

● ● ● ● ●

Which statement about complementary base pairing is not true?

It plays a role in DNA replication

In DNA, T pairs with A

Purines pair with purines, and pyrimidines pair with pyrimidines

In DNA, C pairs with G

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

All statements are correct except (c).

Purines always pair with pyrimidines. This generates uniform distance between two strands of helix.

(page-97)

● ● ● ● ●

Western Blot hybridization is used for:

DNA analysis

RNA analysis

Protein analysis

Polysaccharide analysis

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Western Blotting: Protein analysis

Northern Blotting: RNA analysis

Southern Blotting: DNA analysis

● ● ● ● ●

SNP which is pronounced as "snips” stands for:

Small nuclear protein

Single nucleotide particle

Single nucleotide polymorphism

Small nicking points

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(page-122)

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.