A mammal an ce has an outstretched double-stranded DNA of 1.2 metres which duplicates in 4hr.If it
duplicates at the rate of 20 micrometres/min, how many origins of replication are there in the DNA?
a. 2500
b. 250
c. 25
d. 1
Answers
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8
Answer:
(b) 250
Explanation:
length of D's DNA =1.2m = 1.2 *10ki power 6 um
rate of duplication 20um per minute
time taken for duplication
1.2 *10 ki power 6 /20um =60000min =1000 hrs
actual time taken=4 hrs
no of origin required to complete
duplication in 4h = 1000/ 4 = 250 origin
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