Advertisements
Advertisements
प्रश्न
Meselson and Stahl’s experiment proved ______.
विकल्प
Transduction
Transformation
DNA is the genetic material.
Semi-conservative nature of DNA replication.
Advertisements
उत्तर
Meselson and Stahl’s experiment proved Semi-conservative nature of DNA replication.
Explanation:
The Meselson and Stahl experiment (1958) definitively proved that DNA replication is semiconservative, meaning each new DNA molecule consists of one original parental strand and one newly synthesised strand. By growing E. coli bacteria in heavy nitrogen (15N) and then switching them to a medium with light nitrogen (14N), the researchers used density gradient centrifugation to observe the DNA’s weight over generations. They found that after one generation, all DNA was of intermediate density (a hybrid of heavy and light), and after two generations, half the DNA was hybrid and half was entirely light, which confirmed that the parent strands separate and serve as templates for new matching strands.
APPEARS IN
संबंधित प्रश्न
Explain the semi-conservative replication of eukaryotic DNA.
Explain replication of bacteriophage with the help of a suitable diagram.
What is Bacteriophage?
Semiconservative mechanism of DNA was detected using:
During DNA replication, the separated strands of DNA are prevented from recoiling by
Define Heterochromatin.
Describe the process of semiconservative replication of DNA with the help of a neat and labelled diagram.
Okasaki fragments are joined together by ______.
What are Okazaki fragments?
Read the following statements and select the correct option.
i. The unit of DNA in which replication occurs, is called replicon.
ii. In eukaryotes, there is only one replicon however in prokaryotes there are several replicons in tandem.
Match Column I with Column II and select the correct option among the following.
| Column I | Column II | ||
| i. | DNA replication | a. | RNA polymerase |
| ii. | Translation | b. | DNA polymerase |
| iii. | Transcription | c. | Reverse transcriptase |
| iv. | Reverse transcription | d. | t-RNA- amino acid complex |
Complementary strands of DNA molecule are (i) and bound by (ii).
Identify the CORRECT combination of statements with respect to DNA synthesis.
I. Always the direction of DNA polymerization 5' → 3' when referring to the polarity of strand being synthesized.
II. DNA ligase forms hydrogen bonds between two newly synthesized DNA strands.
III. DNA polymerases on their own cannot initiate the process of replication.
IV. DNA polymerase can catalyse polymerization in both 5'→ 3' and 3'→ 5' direction.
Wobble position means:
Match the following column.
| Column - I | Column - II |
| (A) DNA structure | 1. Muller and stadder |
| (B) Semiconservative replication of DNA | 2. Beadle and partum |
| (C) One gene-one enzyme theory | 3. Watson and crick |
| (D) Induction of mutation | 4. Massillon and stahl |
Identify the biomolecule that is capable of self-replication.
What background information did Watson and Crick had available with them for developing a model of DNA? What was their own contribution?
In viral DNA, how many origins of replication is/are present?
