1) ( vtosinr mokes \"p 42\". of the nucleotides in Appro of the nucleotides in a
ID: 132752 • Letter: 1
Question
1) ( vtosinr mokes "p 42". of the nucleotides in Appro of the nucleotides in a sample of DSA from an organism simately what of the nucleotides in this sample will be thymine? B) 16% C) 31% D) 42% E) It cannot be from the information provided 2) In an analysis of the nucleotide composition of DNA, which of the following will be found? 'A) A "C" B) A -Gand C-T D)G+C-T+A 3) In E coli, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin. Which of the follow ing would you expect as a result of this mutation? A) No proofreading will occur B) No replication fork will be formed. C) The DNA will supercoil. D) Replication will occur via RNA polymerase alone. E) Replication will require a DNA template from another source 4) Which enzyme catalyzes the elongation of a DNA strand in the 53 direction? A) primase B) DNA ligase C) DNA polymerase III D) topoisomerase E) helicase 5) The leading and the lagging strands differ in that A) the leading strand is synthesized in the same direction as the movement of the replication fork, and the lagging strand is synthesized in the opposite direction B) the leading strand is synthesized by adding nucleotides to the 3' end of the growing strand, and the lagging strand is synthesized by adding nucleotides to the 5' end. C) the lagging strand is synthesized continuously, whereas the leading strand is synth in short fragments that are ultimately stitched together D) the leading strand is synthesized at twice the rate of the lagging strand.Explanation / Answer
answer 1
according to chargaff's rules,dna of any oragnism should have 1:1 ratio of pyrimidine and purine bases.
so.guanine =cytosine=42 % each.so
adenine=thymine=100-(42+42)/2=8% each.
answer 2
option c.since purines will be equal to pyrimidine.
answer 3
helicase separate the double stranded dna to single strands so each strand can be copied.their mutation will result in option b .no reading of the dna.
answer 4)
option b.dna polymerase has 5'-3' activity.
answer 5)
option c.
lagging strands are synthesised in small sections called okazaki fragments that are actually short dna lengths.these are stitched later.
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