On This Page
This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Molecular Basis of Inheritance Set 3
Q1 | How many bases consist in an average gene ?
- 3, 00, 000
- 3000
- 4, 00, 000
- 4000
Q2 | Match the following using salient features of Human genome project A B(P) Less than 2 % genome (i) 3 billion nucleotide bases(Q) Chromosome 1 (ii) 231 genes(R) Y chromosome (iii) 2968 genes(S) Human genome (iv) codes for protein
- (P - iv) (Q - iii) ( R - ii) ( S - i)
- ( P - iv) (Q - ii) (R - iii) (S - i)
- (P - iv) (Q - i) (R - ii) (S - iii)
- (P - i) (Q - iii) (R - iv) (S - ii)
Q3 | State the use of moleculer medicine ?
- Improves diagnosis of diseases
- Used as gene theraphy
- Used to understand several diseass like Alzheimer’s Parkinsons diseases etc.,
- All the above
Q4 | Among the following which is used for separation of DNA fragments ?
- centifugation
- Cell fractionation
- Cell homogenation
- Electrophoresis
Q5 | In Which of the following DNA not directly involved ?
- Repication
- Transcription
- Translation
- Transformation
Q6 | Transcription begins when one of the following enzymes binds to promotor site.
- DNA polymerase
- RNA polymerase
- helicase
- Gyrase
Q7 | What dose A & B represent ?
- Grycase , Helicase
- Double Stranded Protein, Helicase
- Helicase, Single strand binding protein
- Topoisomerase Helicase
Q8 | State the process and mention the labelled protion.
- Process of Translation - X-RNA Polymerase- Y-DNA Template- Z-m RNA Transcript
- process of Transcription - X-RNA Polymerase- Y-DNA Template- Z- RNA Transcript
- process of Translocation - X-DNA polymerase- Y- Template- Z- Transcript
- Process of Transformation - X - DNA polymerase- Y - RNA template- Z - RNA transcript
Q9 | What do P, Q, R and S regions of t RNA ?
- P - Anticodon loop
- P. D LoopQ - Variable loop Q - T ? c loopR - T ? c loop R - Variable loopS - D Loop S - Anticodon loop
- P - T ? c loop
- P - Anticodon LoopQ - D loop Q - T ? c loop R - Anticodon loop R - D loop S - Variable loop S - Variable loop
Q10 | Which state is represent by the above model
- Repressed state of lac operon
- Inactive state of Lac operon
- Active state of Lac operon
- Induced state of Lac operon
Q11 | What does X replesent in the above diagram
- Released polypeptide chain
- Released 3D protein molecule
- Released secondary protein
- Released tertiary protein
Q12 | What does ‘X’ represent
- gene
- segment of DNA
- seqment of DNA coding for specific protein
- Both A & C
Q13 | Write the codon for the anticodon on the t - RNA
- AGU
- UGU
- UGA
- ACU
Q14 | In the genetic code dictionary how many codons are used to code for all the 20 essential amino-acids?(AIPMT - 2003)
- 20
- 64
- 61
- 60
Q15 | What would happen if in a gene encoding polypeptide of 50 aminoacids 25th codon (UAU) is mutated to UAA ? (AIPMT - 2003)
- A Polypeptide of 24 aminoacids will be formed
- Two polypeptides of 24 and 25 aminoacids will be formed
- A polypeptide of 49 aminoacids will be formed
- A polypeptide of 25 aminoacids will be formed
Q16 | Which one of the following triplet codes, is correctly matched with its specificity for an aminoacid in protein synthesis or as ‘start’ or ‘stop’ codon ?
- UCG - start
- UUU - stop
- UGU - Leucine
- UAC - Tyrosine
Q17 | What does “Lac” refer to in what we call the lac operon ? (AIPMT - 2003)
- Lactose
- Lactase
- Lac insect
- The number 1,00,000
Q18 | The following ratio is generally constant for a given species (AIPMT - 2004)
- A + G / C + T
- T + C / G + A
- G + C / A + T
- A + C / T + G
Q19 | During transcription if the nucleotide sequence of the DNA strand that is being coded is ATACGthen the nucleotide sequence in the m RNA would be (AIPMT - 2004)
- TATGC
- T C T G G
- U A U G C
- U A T G C
Q20 | Which one of the following makes use of RNA template to synthesize DNA (AIPMT - 2005)
- DNA polymerase
- RNA polymerase
- Reverse transcriptase
- DNA dependant RNA polymerase
Q21 | Protein synthesis is an animal cell occurs (AIPMT - 2005)
- only on the ribosomes present in cytosol
- only on ribosomes attached to the nuclear envelope and endoplasmic reticulum
- On ribosomes present in the nucleolus as well as in cytoplasm
- on ribosomes present in cytoplasm as well as in mitochondria
Q22 | E coli cells with a mutant z gene of the lac operon cannot grow in medium containing only lactose asthe source of energy because (AIPMT - 2005)
- the lac operon is constitutively active in these cells
- they cannot synthesize functional beta galactosidase
- in the presence of glucose E Coli cell do not utilize lactose
- they cannot transport lactose from the medium into the cell
Q23 | Aminoacid Sequence in protein synthesis is decided by the sequence of (AIPMT - 2006)
- r RNA
- t- RNA
- m RNA
- c DNA
Q24 | Antiparallel strands of a DNA molecule means that (AIPMT - 2006)
- One strand turns clockwise
- One strand turns anticlockwise
- The phosphate groups of two DNA strands , at their ends share the same position
- The phosphate groups at the start of two DNA strands are is opposite position (Pole).
Q25 | Polysome is formed by (AIPMT - 2008)
- a ribosome with several subunits
- ribosomes attached to each other in a linear arrangement
- several ribosomes attached to a single m RNA
- many ribosomes attached to a strand of endoplasmic reticulum