MCQ Bank
All organisms that have a mismatch repair system have MutS and homologs.
- A) MutL
- B)
- C)
- D)
An E. coli chromosome is estimated to have about super-coiled loops.
- A) 400
- B)
- C)
- D)
The first discovered enzyme is known as
- A) Diastase
- B)
- C)
- D)
The incorporation rate of rNTPs is folds lower than dNTPs.
- A) 1000
- B)
- C)
- D)
There are three human MutS homologs
- A) MSH2, MSH3, MSH6
- B)
- C)
- D)
Which enzyme prevents the accumulation of supercoils ahead of the replication fork?
- A) helicase
- B)
- C)
- D)
Hydrolytic deamination of cytosine is estimated to take place about a.... times a day in a mammalian cell
- A) 100 to 500
- B)
- C)
- D)
Which of the following is not a base of RNA?
- A) Thymine(T)
- B)
- C)
- D)
Psoralen can DNA if photo-activated.
- A) Alkylate
- B)
- C)
- D)
The bond angles in protein primary structure resulting from rotations at C are labelled (phi) for the
- A) N-alpha C
- B)
- C)
- D)
Meselson and Stahl performed a classical experiment to distinguish among three possible models of DNA replication using isotope of
- A) N
- B)
- C)
- D)
DNA polymerases introduce about one mis-paired nucleotide per nucleotides.
- A) 10^5
- B)
- C)
- D)
Overall three dimensional arrangement of all atoms in protein
- A) Tertiary structure of protein
- B)
- C)
- D)
In transcription information of DNA is copied from.
- A) mRNA
- B)
- C)
- D)
Pyrimidine consist of???
- A) Heterocyclic aromatic ring structure composed of carbon and nitrogen atoms. It has a six-membered ring with two nitrogen atoms at positions 1 and 3. Examples of pyrimidines include cytosine, thymine (in DNA), and uracil (in RNA).
- B)
- C)
- D)
Most important clue of structure of DNA before 1953
- A) Erwin Chargaff
- B)
- C)
- D)
DNA with bound histone in the eukaryotes is
- A) Chromatin
- B)
- C)
- D)
During DNA replication each strand serve as
- A) template
- B)
- C)
- D)
Mutation is necessary evil as?
- A) not all mutations give advantage to organism
- B)
- C)
- D)
Replication machine achieves remarkably high degree of accuracy
- A) proofreading mechanism
- B)
- C)
- D)