Are you looking for Mcqs on Dna structure? If Yes then you are at right place. Here you will find Dna structure Mcq Questions and Answers, Trivia, Quiz, Interview MCQ & Dna structure Current Affairs for Competitive Exams like Neet exams, around 30% to 40% of Neet questions are asked from given Dna structure Mcqs. as you know Questions and Ansers on Dna structure is very important for Neet Exam. In this Dna structure MCQ section for Neet competition we are covering MCQS on Dna structure
Question : The bases are held together in a DNA double helix by hydrogen bonds. These bonds are
A. Ionic bonds
B. Covalent bonds
C. Non-covalent bonds
D. Van der Waals forces
Question : In DNA, the enzyme which breaks the H2 bonds is
A. Ligase
B. Helicase
C. Topoisomerase
D. Polymerase
Question : The type of coiling in DNA is
A. Zig-zag
B. Left-handed
C. Opposite
D. Right-handed
Question : If the DNA strand has nitrogenous base sequence ATTGCC, the mRNA will have?
A. ATTGCA
B. UGGACC
C. UAACGG
D. ATCGCC
Question : A DNA molecule in which both strands have radioactive thymidine is permitted to replicate in an environment that contains non-radioactive thymidine. What is the right number of DNA molecules which possess some radioactive thymidine post three duplications?
A. one such molecule
B. two such molecules
C. four such molecules
D. eight such molecules
Question : The process of DNA replication is affected by an enzyme known as
A. Mutase
B. Ligase
C. Polymerase I
D. Ribonuclease
Question : In this type of DNA replication, of the two newly formed molecules, one is purely a new one and the other is an old one
A. dispersive
B. conservative
C. semiconservative
D. both (b) and (c)
Question : This force can stabilize a DNA double-helix
A. Hydrophilic sugar-phosphate groups are found on the exterior of the helix where interaction with water occurs
B. Hydrophobic bases are present in the interior of the helix, each base-pair is stabilized by the same number of hydrogen bonds
C. covalent base stacking interactions may take place between neighbouring bases within the same strand in the helix
D. non-covalent N-glycosidic bonds may form between nitrogenous bases in opposite strands in the helix