Practice free Molecular Basis of Inheritance (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
DNA fingerprinting works because:
DNA-fingerprinting is a technique of determining nucleotide sequences of areas of DNA which are unique to each individual. Each person has a unique DNA fingerprint. Only 0.1% of base pairs provide individuality to each person.
DNA replication in eukaryotes differs from replication in bacteria because:
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?
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:
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 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:
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:
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?
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?
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:
Western Blotting: Protein analysis
Northern Blotting: RNA analysis
Southern Blotting: DNA analysis
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