Question
How does replication of the long DNA molecule occur? Explain the process.
OR
Explain the process of DNA replication with the help of a replicating fork.
OR
Explain the process of DNA replication with the help of a replicating fork.
✓
Answer
- Replication of DNA.
- Replication of DNA occurs during S-phase of cell cycle.
- During replication of DNA, the two strands unwind upto a point and a replication fork is formed.
- Since the unwinding cannot take place for the entire length, replicaion starts from the replication fork.
- Both the strands act as templates for DNA synthesis.
- DNA polymerase is the enzyme that polymerises the bases/ nucleotides into a strand of DNA.
- Since this enzyme polymerises the nucleotides in 5' → 3' direction only, on one of the template strands (with 3' → 5' polarity), the new strand is synthesised as a continuous stretch (leading strand); it is called continuous synthesis.
- On the other template strand, (with 5' → 3' polarity), DNA strand is synthesised as short stretches (using primers), called Okazaki fragments; this is called discontinuous synthesis.
- Later, these short stretches are joined by DNA-ligase (lagging strand).
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In a biology class, teacher was telling the students that the structures/components and their functions in a watch can be compared with various levels of organisation we find in nature. Radhika was surprised and asked teacher to explain it. Teacher got impressed with Radhika's interest and explained that there is a systematic arrangement of smaller and simpler components into larger one in a hierarchy or pyramid having different levels where each level is formed of components of lower level and itself becomes part of higher level for achieving a common goal.
(i) What are the four levels of biological organisation found in nature?
(ii) What is the basic unit of ecological organisation?
(iii) Define community.
(iv) What values are shown by Radhika?
(i) What are the four levels of biological organisation found in nature?
(ii) What is the basic unit of ecological organisation?
(iii) Define community.
(iv) What values are shown by Radhika?
As a dairy owner what measures will you adopt to improve the quality of milk?
Describe in detail the steps involved in the replication of DNA.
With the help of labelled diagrams describe the structures of human sperm and unfertilized ovum. A couple unable to conceive. Which modern techniques are available to overcome this problem?
List the advantages of recombinant insulin.
Distinguish between : External respiration and Internal respiration.
What were the control measures taken by Delhi Government for combating air pollution ?
Distinguish between: Open circulation and Closed circulation
Sketch the concept maps for mechanism of vision and mechanism of hearing.
How can you, as an individual, prevent the loss of biodiversity?