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Tripura Board Class 12 (TBSE) DNA Structure and Replication — practice questions

Explore 30 free DNA Structure and Replication questions in Tripura Board Class 12 (TBSE) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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DNA Structure and Replication questions and exercises with answers

Showing questions 1–30 of 30.

Griffith worked with two strains of pneumonia bacteria, which he called rough and:Read the answer and worked solution →Mice injected with the living smooth strain of the bacterium:Read the answer and worked solution →Mice injected with heat killed smooth bacteria together with live rough bacteria:Read the answer and worked solution →Griffith's result, where one strain changed into another, is called:Read the answer and worked solution →The scientists who identified the transforming principle as DNA in 1944 were Avery, MacLeod and:Read the answer and worked solution →Hershey and Chase confirmed DNA as the genetic material by studying a virus that infects:Read the answer and worked solution →In the Hershey and Chase experiment, radioactive phosphorus was used to label the:Read the answer and worked solution →The observation that the amount of A equals T and G equals C is known as:Read the answer and worked solution →The building blocks from which DNA is made are called:Read the answer and worked solution →Adjacent nucleotides in a DNA strand are joined by bonds called:Read the answer and worked solution →The scientist whose X ray diffraction images revealed the shape of DNA was:Read the answer and worked solution →Watson and Crick proposed that DNA consists of two strands twisted into a:Read the answer and worked solution →In the DNA double helix, adenine always pairs with:Read the answer and worked solution →In the DNA double helix, guanine always pairs with:Read the answer and worked solution →The two strands of the DNA double helix run in opposite directions, so they are:Read the answer and worked solution →The enzyme that unwinds the double helix by breaking hydrogen bonds is:Read the answer and worked solution →The enzyme that lays down a short RNA piece to start replication is:Read the answer and worked solution →The strand copied continuously towards the replication fork is called the:Read the answer and worked solution →The short pieces in which the other strand is built are called:Read the answer and worked solution →The strand made in short pieces is called the:Read the answer and worked solution →The enzyme that seals the gaps between fragments by forming phosphodiester bonds is:Read the answer and worked solution →The enzyme that relieves supercoiling ahead of the replication fork is:Read the answer and worked solution →Catch the DNA basesRead the answer and worked solution →Pop the replication enzymesRead the answer and worked solution →Run the DNA gatesRead the answer and worked solution →Slice the DNA termsRead the answer and worked solution →Leading or laggingRead the answer and worked solution →Sort the DNA discoveriesRead the answer and worked solution →Type the numberRead the answer and worked solution →DNA bingoRead the answer and worked solution →

Worked practice questions

Griffith worked with two strains of pneumonia bacteria, which he called rough and:

  1. Smooth
  2. Sticky
  3. Strong
  4. Stable
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Correct answer: A. Smooth

1. One strain had a smooth capsule and one did not. 2. They were named for their appearance. 3. The second was smooth. _Source: OpenStax Biology 2e, Chapter 14, DNA Structure and Function._

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Mice injected with the living smooth strain of the bacterium:

  1. Grew
  2. Died
  3. Lived
  4. Slept
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Correct answer: B. Died

1. The smooth strain was the virulent one. 2. It caused pneumonia in the mice. 3. So the mice died. _Source: OpenStax Biology 2e, Chapter 14, DNA Structure and Function._

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Mice injected with heat killed smooth bacteria together with live rough bacteria:

  1. Died
  2. Lived
  3. Slept
  4. Grew
Show answer and solution

Correct answer: A. Died

1. Neither injection alone was fatal. 2. Something passed from the dead cells to the live ones. 3. So the mice died. _Source: OpenStax Biology 2e, Chapter 14, DNA Structure and Function._

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BiologyClass 12 Biology