Advertisements
Advertisements
प्रश्न
What background information did Watson and Crick had available with them for developing a model of DNA? What was their own contribution?
Advertisements
उत्तर
Wastson and Crick had the following informations which helped them to develop a model of DNA.
- Chargaffs’ Law suggesting A = T, and C = G.
- Wilkins and Rosalind Franklin’s work on DNA crystal’s X-ray diffraction studies about DNA’s physical structure.
- Watson and crick proposed
- How complementary bases may pair
- Semi-conservative replication and
- Mutation through tautomerism
APPEARS IN
संबंधित प्रश्न
What is the correct sequence of the stages in bacteriophage lytic cycle?
(A) Attachment, Penetration, Lysis, Multiplication
(B) Attachment, Penetration, Multiplication, Lysis
(C) Lysis, Penetration, Multiplication, Attachment
(D) Attachment, Lysis, Multiplication, Penetration
Draw neat and labelled diagram of Replication Fork.
Meselson and Stahl’s experiment proved ______.
______ heavy isotope was used by Meselson and Stahl during their experiment.
In which direction polymerization of DNA nucleotides occurs during the synthesis of lagging strand?
Assertion (A): DNA replication is said to be semi-conservative.
Reason (R): After DNA replication, each daughter molecule has one old and one new strand.
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.
Which of the following is present at the sticky ends of a fragmented DNA molecule?
Read the following statements and select the correct option.
Statement I: DNA replication is continuous on leading strand while on the lagging strand it is discontinuous.
Statement II: DNA polymerase cannot initialize polymerization without a primer.
Which of tbe following is generally used for creating density gradient during centrifugation?
In DNA molecule, pairing between two complementary nucleotides takes place by ________ bonds.
Select the mis-matched pair.
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 |
Which of the following reaction is required for proofreading during DNA replication by DNA polymerase III?
Draw a suitable diagram of replication of eukaryotic DNA and label any three parts.
In prokaryotes, the primers of lagging strands are removed by ______.
The sequence of nitrogenous bases on DNA molecule is ATCGA. Which of the following is the correct complementary sequence of nitrogenous bases on mRNA molecule?
Which of the following statement is correct regarding the process of replication in E.coli?
Statement I - In prokaryotes, there is only replicon however in eukaryotes, these are several replicons in tandem.
Statement II - Two separated strands in a replicon of DNA are prevented from re-joining by helicase enzyme.
In light of above statements, choose the correct answer from the option given below.
