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Home⇒ Medical Science⇒ Biochemistry⇒ Nucleic acids
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 ⇒ Nucleoside is a pyrimidine or purine base covalently bonded to a sugar [other wrong options] [Discuss in forum] ![]() ![]() ionically bonded to a sugar hydrogen bonded to a sugar none of the above |
Q2 ⇒ The unfavourable free energy associated with not satisfying a hydrogen bond after formation of the double helix is approximately 20 kJ/mol [other wrong options] [Discuss in forum] ![]() ![]() 10 kJ/mol 25 kJ/mol 30 kJ/mol |
Q3 ⇒ In gel electrophoresis, what fragments will move most quickly through a gel? Small fragments [other wrong options] [Discuss in forum] ![]() ![]() Large fragments Large genome None of these |
Q4 ⇒ Thymidine all of the above [other wrong options] [Discuss in forum] ![]() ![]() can participate in hydrophobic interactions due to its methyl group is replaced by uracil in RNA normally forms two hydrogen bonds with adenosine |
Q5 ⇒ The most stabilizing force for nucleic acids is Van der Waals [other wrong options] [Discuss in forum] ![]() ![]() hydrogen bonds electrostatic bond conformational entropy |
Q6 ⇒ The glycosidic bonds in DNA and RNA connect the sugar to the base [other wrong options] [Discuss in forum] ![]() ![]() can be hydrolyzed by OH- ion stabilize Watson-Crick H-bonds are free to rotate over about 180° |
Q7 ⇒ Which of the following is a purine? Adenine [other wrong options] [Discuss in forum] ![]() ![]() Cytosine Thymine Uracil |
Q8 ⇒ The sugar in RNA is __________ , the sugar in DNA is __________ ribose, deoxyribose [other wrong options] [Discuss in forum] ![]() ![]() deoxyribose, ribose ribose, phosphate ribose, uracil |
Q9 ⇒ A five carbon sugar lacking a hydrogen at the number 2 carbon is found in DNA [other wrong options] [Discuss in forum] ![]() ![]() RNA mRNA rDNA |
Q10 ⇒ Because DNA is a highly charged polyanion, its stability to heat denaturation increases with increasing salt [other wrong options] [Discuss in forum] ![]() ![]() does not depend on hydrophobic interactions is independent of G - C content decreases with increasing salt |
Q11 ⇒ Nucleotide bases and aromatic amino acids absorb light respectively at 260 and 280 nm [other wrong options] [Discuss in forum] ![]() ![]() 280 and 260 nm 270 and 280 nm 260 and 270 nm |
Q12 ⇒ Which of the following is found on RNA but not DNA? Uracil [other wrong options] [Discuss in forum] ![]() ![]() Deoxyribose Phosphate Adenine |
Q13 ⇒ A nucleotide consists of a sugar, a base and a phosphate [other wrong options] [Discuss in forum] ![]() ![]() a sugar and a phosphate paired bases a sugar, a base and three phosphates |
Q14 ⇒ Nucleic acids can be analyzed experimentally by their absorption of uv light [other wrong options] [Discuss in forum] ![]() ![]() molecular weight absorption of visible light none of these |
Q15 ⇒ Which pyrimidine base contains an amino group at carbon 4? Cytosine [other wrong options] [Discuss in forum] ![]() ![]() Thymine Uracil Adenine |
Q16 ⇒ A purine with an amine (NH2) group on the 6th carbon is adenine [other wrong options] [Discuss in forum] ![]() ![]() cytosine thymine guanine |