Class XII · Biology practice

Molecular Basis of Inheritance MCQs

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668 questions in this collection · Page 28 of 67

Question 271 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Avery, MacLeod, and McCarty discovered that the biochemical nature of the transforming principle was _______

They identified DNA as the genetic material causing transformation.

Question 272 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Digestion with _______ inhibited transformation, suggesting that the DNA caused the transformation.

Only DNase treatment stopped transformation, proving DNA was the agent.

Question 273 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The unequivocal proof that DNA is the genetic material came from the experiments of _______

Hershey and Chase provided the final proof using bacteriophages.

Question 274 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Hershey and Chase worked with _______

They used viruses that infect bacteria (bacteriophages).

Question 275 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Hershey and Chase grew viruses in the presence of radioactive _______ to label protein.

Radioactive Sulfur (S35) labels proteins because they contain sulfur.

Question 276 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Radioactive _______ was used to label DNA in the Hershey-Chase experiment.

Radioactive Phosphorus (P32) labels DNA because it contains phosphates.

Question 277 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

Bacteria which were infected with viruses that had radioactive DNA were _______

The radioactive DNA entered the bacteria, making them radioactive.

Question 278 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

The first genetic material to evolve was likely _______

The RNA World hypothesis suggests RNA was the first genetic material.

Question 279 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

2' OH group present at every nucleotide in RNA is a _______ group.

The 2' OH group makes RNA labile and reactive.

Question 280 of 668

📘 CLASS XII

Molecular Basis Of Inheritance

DNA is chemically _______ reactive and structurally more stable when compared to RNA.

DNA is less reactive and thus more stable than RNA.

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