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Home⇒ Medical Science⇒ Biochemistry⇒ Dna structure and replication
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ The accepted hypothesis for DNA replication is semi-conservative theory [other wrong options] [Discuss in forum] conservative theory dispersive theory evolutionary theory |
Q2 ⇒ The most common liquid volumes in molecular biology are measured in μl [other wrong options] [Discuss in forum] ml nl 1 |
Q3 ⇒ In the study of one experiment it was found that the value of Tm for DNA is = 40° C. If the cell has 20% GC at the above Tm, then what will be value of 'Tm' if the GC% increases to 60%? Increases [other wrong options] [Discuss in forum] Remains same Decreases Can not be compared |
Q4 ⇒ Which of the following would not contain DNA? Glass crystals [other wrong options] [Discuss in forum] Yeast Bacteria Mold |
Q5 ⇒ In sperm heads, DNA is particularly highly condensed and the histones are replaced with small basic protein called protamines [other wrong options] [Discuss in forum] purines pyrimidines all of the above |
Q6 ⇒ The 5' and 3' numbers are related to the carbon number in sugar [other wrong options] [Discuss in forum] length of the DNA strand the number of phosphates the base pair rule |
Q7 ⇒ DNAs when charged, migrate in a gel towards the positive pole [other wrong options] [Discuss in forum] negative pole will not migrate none of these |
Q8 ⇒ Enzymes, responsible for unraveling short segments of DNA is helicase [other wrong options] [Discuss in forum] DNA polymerase DNA ligase primase |
Q9 ⇒ Klenow fragment without free nucleotides exhibits exonuclease activity [other wrong options] [Discuss in forum] endonuclease activity nickase activity no activity |
Q10 ⇒ The chromosomal DNA complexes with five types of histone as H1, H2A, H2B, H3 and H4 [other wrong options] [Discuss in forum] three types of histone as H1, H2A and H4 four types of histone as H1, H2A, H3 and H4 two types of histone as H1 and H4 |
Q11 ⇒ In DNA, guanine pairs with Cytosine [other wrong options] [Discuss in forum] Adenine Thymine Uracil |
Q12 ⇒ If one cell has AT contents 40%, what will be the percentage of Guanine residue? 0.3 [other wrong options] [Discuss in forum] 0.6 0.15 Guanine residue can not be calculated |
Q13 ⇒ What is the main damaging effect of UV radiation on DNA? Formation of thymine dimers [other wrong options] [Discuss in forum] Depurination Single strand break Dehydration |
Q14 ⇒ Messelsen and Stahl model of replication was called semi-conservative replication [other wrong options] [Discuss in forum] conservative replication dispersive replication Cri du Chat |
Q15 ⇒ What is the approximate size (in kb) of the E. coli genome? 4500 kilobase [other wrong options] [Discuss in forum] 3000 kilobase 5500 kilobase 6500 kilobase |
Q16 ⇒ Enzyme, responsible for proofreading base pairing is DNA polymerase [other wrong options] [Discuss in forum] Telomerase Primase DNA ligase |
Q17 ⇒ E.coli DNA polymerases II and III lack 5' → 3' exonuclease activity [other wrong options] [Discuss in forum] 5' → 3' endonuclease activity partially 5' → 3' exonuclease activity partially 5' → 3' endonuclease activity |
Q18 ⇒ Telomeres are usually rich in which nucleotide? Guanine [other wrong options] [Discuss in forum] Adenine Thymine Cytosine |
Q19 ⇒ DNA gyrase in E. coli can be inhibited with antibiotics [other wrong options] [Discuss in forum] adds positive supercoils to chromosomal DNA is required only at the oriC site performs the same function as helicase in eukaryotes |
Q20 ⇒ The overall conclusion of the Hershey-Chase experiment was that DNA was responsible for heredity [other wrong options] [Discuss in forum] proteins and DNA were responsible for heredity the ratio of Adenine to thymine was always the same phage DNA was similar to bacterial DNA |
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