The scientist who discovered that DNA is the genetic material in bacteriophages was: MCQ with Answer and Explanation

The scientist who discovered that DNA is the genetic material in bacteriophages was:
A. Watson and Crick
B. Hershey and Chase
C. Meselson and Stahl
D. Avery, MacLeod, McCarty
Answer: Option B
Solution (By JKSSB Mock Tests)
Hershey and Chase (1952) used radioactive isotopes (³²P and ³⁵S) to show that DNA, not protein, enters bacteria during T2 phage infection and is the genetic material. Avery et al. earlier showed transforming principle was DNA. Watson and Crick determined structure, Meselson-Stahl replication mode.

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Practice More Biology Questions

Question #1
In plant physiology, the 'Imbibition' is a special type of diffusion where water is absorbed by solid particles (colloids), causing them to increase in volume. This process is crucial for:
A. The opening and closing of stomata
B. The translocation of sugars in the phloem
C. The initial absorption of water by dry seeds, leading to germination
D. The ascent of sap in tall trees

Correct Answer: Option C


Explanation:
Imbibition is a physical process where solid, hydrophilic (water-loving) colloidal materials (like cellulose, pectin, proteins, and starch) adsorb water, causing a tremendous increase in their volume and generating significant imbibitional pressure. This process is the very first step in seed germination. When a dry seed is exposed to water, its cell walls and storage materials imbibe water, causing the seed to swell, rupturing the seed coat, and initiating the metabolic activities required for the seedling to grow. It is also responsible for the splitting of rocks by plant roots.

This question belongs to: Science Biology
Question #2
What does ICZN stand for in biological nomenclature?
A. International Code for Zoological Nomenclature
B. Indian Code of Zoological Nomenclature
C. Indian Commission for Zoological Names
D. International Commission on Zoological Nomenclature

Correct Answer: Option D


Explanation:
ICZN stands for the International Commission on Zoological Nomenclature. It is the organization that establishes and maintains the International Code of Zoological Nomenclature, which provides the universal rules for naming animals to ensure stability and universality in scientific names.

This question belongs to: Science Biology
Question #3
Consider the following statements about DNA fingerprinting:
1. It uses VNTRs (variable number tandem repeats).
2. It can be used in paternity testing.
3. It requires amplification by PCR.
Which of the above is/are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 1, 2, and 3
D. 2 and 3 only

Correct Answer: Option C


Explanation:
DNA fingerprinting analyzes VNTRs, often amplified by PCR, and is used in forensics and paternity. All three are correct.

This question belongs to: Science Biology