21. This figure-- -= represents nns of the DNA molecules prior to DNA, eplicatio

Question

21. This figure-- -= represents nns of the DNA molecules prior to DNA, eplication in a zygote (in GI). The discentinued line synthesized in the first roond, and the solid line ( ) systhesized in the second round of replicatios. After two rounds of DNA replication, the four daughter DNA molecules present in the four embryonie cells would be: represents new DNA strands represents new DNA strands z2-Adenine makes up28% of the nucleotides of percentage ef the aucleotides of chromosome 1 in Mary's germ cell is Guanine? You have to assume that chromesome I has the same percentages of the four bases in all humans A:28% C-50% D-44% E-22% 23- Which of the following is correct about DNA molecule? A. In each DNA strand, A. T and C.-G B-A T-G+C C-A+T-50% ofthe total bases D-A+C-G+T E- Two of the abowe F- Three of the above G- All of the above 24-Suppose a nucleotide is present in a DNA biosynthesis reaction that has no hydrexyl greup on the 3' carbon of the deoxyribose sugar. What effect would that have on DNA replication? A- This nucleotide cannot be added to the growing strand, so replication will stop right away B- The direction of replication will be reversed (from 3' to 5) after this macleotide is added. C- This macleotide will be added to the growing strand, and then DNA synthesis will stop. D- No effect. DNA replication will continue normally, and two DNA molecules will be generated 25. A human egg cell is abnarmally fertillzed by two X bearing sperm cells. Which of the following NOT correct about the resulting zygote? A- Would have 3n genetic material B- Would have three sets of chromosomes C- Would have three copies of all chromosomes D- Would have 69 DNA molecules E- Would have 2n +1 chromosomes (47 chromosomes) F- Two of the above are not correct

Explanation / Answer

23- three of them are correct

24-this nucleotide will be added to growing chain and then dna synthesis will stop

25-two of above are incorrect

Note- the number of purine A ,G and no of pyrimidine C , T are equal in dna i.e A + T = C+G

When dna has one extra copy of one chromosome not all will have an extra copy nor the 69 dna molevule .

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