Question
Why are Okazaki fragments formed on lagging strand only?
1.The lagging template is the template strand with free 5’ end.
2.The replication always starts at C-3 end of template strand and proceeds towards C-5 end.
3.Both the strands of the parental DNA are antiparallel and new strands are always formed in 5′ → 3′ direction, i.e. DNA polymerase synthesizes new strand in only one direction i.e. 5′ → 3′ direction.
4.Hence, the lagging templates becomes available for replication only discontinuously in small patches.
5.The new lagging strand develops discontinuously away from the replicating fork in the form of small Okazaki fragments.
6.Hence, Okazaki fragments formed on lagging strand only.
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| Column A (Phase of growth) | Column B (Condition) |
| (1) Lag phase | (a) Growth rate faster |
| (2) Log phase | (b) Growth rate steady state |
| (3) Stationary phase | (c) Growth rate slow |
wBCs | % | Nucleus | Function |
Neutrophils | 70% | ________________________ | |
| ________ | ________ | Twisted | Secretes heparin, histamine and serotonin |
Fosinophils | ________ | ________ | Antihistamin / Antiallergic in function |
Manocytes | 3-5% | ________ | ________________________ |
| ________ | ________ | ________ | Responsible for cell mediated as well as humoral immunity |
| Column A | Column B |
| (1) Tansley | (a) 10% law |
| (2) C. Elton | (b) Ecosystem services |
| (3) R. Lindemann | (c) Ecological pyramids |
| (4) Millennium Ecosystem Assessment report | (d) Ecosystem |