Advertisements
Advertisements
प्रश्न
From their examination of the structure of DNA, What did Watson and Crick infer about the probable mechanism of DNA replication, coding capability, and mutation?
उत्तर
Inference of Watson and Crick on DNA replication:
They concluded that each of the DNA strand in a helix act as template during DNA replication leading to formation of new daughter DNA molecules, which are complementary to parental strand, (i.e., Semi-conservative method of replication).
Inference on coding capability:
During transcription, the genetic information in the DNA strand is coded to mRNA as complementary bases, (except for uracil in place of thymine in RNA).
Inference on mutation:
Any changes in the nucleotide sequence of DNA leads to corresponding alteration in aminoacid sequence of specific protein thus confirming the validity of genetic code.
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
Very Short Answer Question:
Why are Okazaki fragments formed on lagging strand only?
Long Answer Question:
Explain the process of DNA replication.
A DNA segment has 75 cytosine and 40 thymine nucleotides. What shall be the total number of phosphates in the DNA segment?
What is the basis for the difference in the synthesis of the leading and lagging strand of DNA molecules?
Meselson and Stahl’s experiment proved ____________.
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.
E. coli, in which both the strands of DNA are labeled with 15N is transferred to 14N medium and allowed to replicate for three generations. What would be the number of hybrid DNA molecules in the third generation?
Enzyme ______ brings about the DNA unwinding by breaking weak hydrogen bonds in the vicinity of origin.
Which of the following is present at the sticky ends of a fragmented DNA molecule?
The addition of nucleotides on the lagging strand occurs ____________ during DNA replication.
Which one of the following can form a nucleotide of DNA?
When the DNA molecule appears like inverted Y, it is ______
Nucleolus is a major center for:
Extension of the plasma membrane in a prokaryotic cell is ______.
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 |
Okazaki segments are formed during ______.
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.
