MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 4751. |
Match the following and mark the correct option Column A Column B (i) Oncogenes (1) Causes AIDS (ii) Single circular DNA (2) Lac-Operon concept (iii) Splicing (3) Component of bacterial chromosome (iv) Jacob and Monad (4) Processing of mRNA molecules (5) When activated cause cancer (i) (ii) (iii) (iv) |
| A. | (5) (4) (1) (2) |
| B. | (5) (3) (4) (1) |
| C. | (5) (3) (4) (2) |
| D. | (1) (3) (4) (2) |
| Answer» D. (1) (3) (4) (2) | |
| 4752. |
DNA is found primarily [AMU 1990] |
| A. | In cell nucleus |
| B. | Outside the cell nucleus |
| C. | In cell cytoplasm |
| D. | None of these |
| Answer» B. Outside the cell nucleus | |
| 4753. |
The one which is capable of self-replication is [CPMT 1993; CMC Vellore 1994] |
| A. | DNA |
| B. | RNA |
| C. | Enzyme |
| D. | Protein |
| Answer» B. RNA | |
| 4754. |
Clover leaf model of tRNA has |
| A. | Acceptor arm and C arm |
| B. | Anticodon arm |
| C. | D arm |
| D. | All the above |
| Answer» E. | |
| 4755. |
Chemically DNA differs from RNA in having [Bihar MDAT 1992; CPMT 1996, 2003; Pb. PMT 2000; MP PMT 1998, 2001; J&K CET 2005] |
| A. | Thymine in place of uracil |
| B. | Single strand |
| C. | Ribose sugar instead of deoxyribose sugar |
| D. | All of the above |
| Answer» B. Single strand | |
| 4756. |
Synthesis of DNA takes place by [CPMT 1989, 2003] |
| A. | Transduction |
| B. | Transcription |
| C. | Transformation |
| D. | Replication |
| Answer» E. | |
| 4757. |
Histone occupies the major grooves of DNA at an angle of [CPMT 1984; CBSE PMT 2002] |
| A. | \[{{15}^{o}}\] |
| B. | \[{{90}^{o}}\] |
| C. | \[{{45}^{o}}\]to the helix axis |
| D. | \[{{30}^{o}}\]to the helix axis |
| Answer» D. \[{{30}^{o}}\]to the helix axis | |
| 4758. |
Which one of the following ratio is constant in DNAs of different species [AIIMS 1986] |
| A. | A + T / C + G |
| B. | A + G / T + C |
| C. | A + C / U + G |
| D. | A + U / C + G |
| Answer» C. A + C / U + G | |
| 4759. |
Which enzyme is responsible for linking the fragments of DNA [CBSE PMT 1996] |
| A. | DNA polymerase III |
| B. | Endonuclease |
| C. | DNA polymerase I |
| D. | DNA ligase |
| Answer» E. | |
| 4760. |
A DNA molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of DNA molecules that contain some radioactive thymidine after three duplications [AIIMS 1980; DPMT 1993] |
| A. | There will be four such molecules |
| B. | There will be eight such molecules |
| C. | There will be only one such molecule |
| D. | There will be two such molecules |
| Answer» E. | |
| 4761. |
Enzyme aminoacyl synthetase is responsible for |
| A. | Initiating mRNA synthesis |
| B. | Charging tRNA molecules |
| C. | Combining tRNA at P site of mRNA |
| D. | None of the above |
| Answer» C. Combining tRNA at P site of mRNA | |
| 4762. |
On which part of tRNA, amino acid gets linked |
| A. | Anticodon loop |
| B. | Variable loop |
| C. | 3¢ end |
| D. | 5¢ end |
| Answer» D. 5¢ end | |
| 4763. |
In which form of RNA most nucleotides are in modified form |
| A. | mRNA |
| B. | rRNA |
| C. | tRNA |
| D. | hnRNA |
| Answer» D. hnRNA | |
| 4764. |
Average life span of mRNA in eukaryotes is |
| A. | 5 minutes |
| B. | 10 minutes |
| C. | 30 minutes |
| D. | More than one hour |
| Answer» E. | |
| 4765. |
Cyclic adenosine monophosphate was discovered by [DPMT 1993] |
| A. | Bekhor et al |
| B. | E.W. Sutherland |
| C. | Beerman |
| D. | Weismann |
| Answer» C. Beerman | |
| 4766. |
Life span of mRNA in E. coli is |
| A. | Less than one minute |
| B. | 2 minutes |
| C. | Five minutes |
| D. | More than 10 minutes |
| Answer» C. Five minutes | |
| 4767. |
The name "mRNA'' was given by |
| A. | Kornberg and Khorana |
| B. | Khorana and Nirenberg |
| C. | Jacob and Monad |
| D. | Messelson and Stahl |
| Answer» D. Messelson and Stahl | |
| 4768. |
Who used heavy nitrogen N15 for proving semiconservative way of DNA replication [MP PMT 1993] |
| A. | Masters and Broda |
| B. | Meselson and Stahl |
| C. | Watson and Crick |
| D. | Jacob and Monad |
| Answer» C. Watson and Crick | |
| 4769. |
Which form of RNA is most heterogeneous [Haryana PMT 2005] |
| A. | tRNA |
| B. | mRNA |
| C. | rRNA |
| D. | hnRNA |
| Answer» E. | |
| 4770. |
Who first suggested bidirection DNA replication process |
| A. | M. Masters |
| B. | P. Broda |
| C. | (a) and (b) both |
| D. | Meselson |
| Answer» D. Meselson | |
| 4771. |
Which one of the following is called polynucleotide joining enzyme [CBSE PMT 2002] |
| A. | Polymerase I |
| B. | Polymerase II |
| C. | Ligase |
| D. | Ribonuclease |
| Answer» D. Ribonuclease | |
| 4772. |
Process of DNA replication is effected by an enzyme called |
| A. | Ligase |
| B. | Mutase |
| C. | Ribonuclease |
| D. | Polymerase I |
| Answer» E. | |
| 4773. |
For providing evidence in favour of semiconservative way of DNA replication; Taylor, Woods and Hughes performed experiments on |
| A. | Drosophila |
| B. | Pisum sativum |
| C. | Allium sepa |
| D. | Vicia faba |
| Answer» E. | |
| 4774. |
Isolation and purification of specific DNA segment from a living organism was achieved by [CBSE PMT 1993] |
| A. | Crick |
| B. | Nirenberg |
| C. | Khorana |
| D. | Beckwith and his colleagues |
| Answer» C. Khorana | |
| 4775. |
In which type of DNA replication of the two newly formed molecules one is purely a new one and the other one is old |
| A. | Conservative |
| B. | Semiconservative |
| C. | Dispersive |
| D. | Both (a) and (b) |
| Answer» C. Dispersive | |
| 4776. |
Semiconservative model of DNA replication was proposed by which workers in eukaryotes [MP PMT 1994, 96] |
| A. | Taylor, Woods and Hughes |
| B. | Messelson and Stahl |
| C. | Nirenberg and Khorana |
| D. | Watson and Crick |
| Answer» C. Nirenberg and Khorana | |
| 4777. |
Which one of the following is not a process of DNA replication |
| A. | Palindromic |
| B. | Dispersive |
| C. | Conservative |
| D. | Semiconservative |
| Answer» B. Dispersive | |
| 4778. |
Feulgen reaction is a special test for [BHU 1983; AFMC 1983; CPMT 1985; MP PMT 2000] |
| A. | RNA |
| B. | DNA |
| C. | Protein |
| D. | Carbohydrate |
| Answer» C. Protein | |
| 4779. |
Franklin and Wilkins showed that DNA [DPMT 1993] |
| A. | Contains four bases |
| B. | Is a helix |
| C. | Has equal amount of adenine and thymine |
| D. | Is made up of nucleotides |
| Answer» C. Has equal amount of adenine and thymine | |
| 4780. |
Uridine monophosphate is found in [Kerala CET 2002] |
| A. | Centrosome |
| B. | Lysosome |
| C. | Cell wall |
| D. | RNA |
| Answer» E. | |
| 4781. |
The double helix model of Watson and Crick is known as [CPMT 2004] |
| A. | C-DNA |
| B. | B-DNA |
| C. | Z-DNA |
| D. | D-DNA |
| Answer» C. Z-DNA | |
| 4782. |
The base sequence for a nucleic acid segment is given CAG, AGG, CGA, CCA. From this, it can definitely be concluded that it is a segment of [AIIMS 1983] |
| A. | DNA strand |
| B. | mRNA strand |
| C. | tRNA strand |
| D. | Data not sufficient |
| Answer» E. | |
| 4783. |
The contribution of cytoplasmic DNA in cells to total DNA is [DPMT 1986] |
| A. | 1 to 5% |
| B. | 45 to 50% |
| C. | 65 to 75% |
| D. | 95 to 99% |
| Answer» B. 45 to 50% | |
| 4784. |
Breakthrough of the year 2002 [Kerala CET 2003] |
| A. | cDNA |
| B. | 16 SrRNA |
| C. | rDNA |
| D. | miRNA |
| Answer» E. | |
| 4785. |
Larger sub-unit of ribosome is composed of how many rRNA molecules |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 4786. |
Heterogenous nuclear RNA |
| A. | Has lesser number of nucleotides |
| B. | Has at least 50 nucleotides |
| C. | Has about 100 nucleotides |
| D. | Has about 200 or more nucleotides |
| Answer» E. | |
| 4787. |
The function of tRNA is [CPMT 1988] |
| A. | Production of mRNA |
| B. | Production of ribosomes |
| C. | Production of microsomes |
| D. | Selection of amino acids |
| Answer» E. | |
| 4788. |
Complementary DNA (cDNA) is complementary to |
| A. | mRNA |
| B. | tRNA |
| C. | rRNA |
| D. | None of the above |
| Answer» B. tRNA | |
| 4789. |
Degeneration of DNA after heating can be studied by comparing [Wardha 2005] |
| A. | A : T ratio |
| B. | G : C ratio |
| C. | Sugar : Phosphate |
| D. | Number of nucleotides |
| Answer» E. | |
| 4790. |
DNA is double helix and [Wardha 2005] |
| A. | Complementary and parallel |
| B. | Complementary and antiparallel |
| C. | Without super coils |
| D. | Always circular |
| Answer» C. Without super coils | |
| 4791. |
Supercoiled DNA can be traced in [Wardha 2005] |
| A. | Prokaryotes and eukaryotes |
| B. | Eukaryotes only |
| C. | Prokaryotes only |
| D. | None of these |
| Answer» B. Eukaryotes only | |
| 4792. |
Genetic information transfer nucleus to cytoplasm by [MP PMT 2005] |
| A. | DNA |
| B. | RNA |
| C. | Lysosome |
| D. | All |
| Answer» C. Lysosome | |
| 4793. |
Who was awarded Nobel Prize for synthesis of RNA in 1959 [BVP 2003] |
| A. | S. Ochoa |
| B. | A. Kornberg |
| C. | H. Khorana |
| D. | Nirenberg |
| Answer» B. A. Kornberg | |
| 4794. |
Which is soluble RNA [CPMT 2005] |
| A. | hnRNA |
| B. | rRNA |
| C. | mRNA |
| D. | tRNA |
| Answer» E. | |
| 4795. |
Messenger RNA is produced in [CPMT 2005] |
| A. | Nucleus |
| B. | Golgi apparatus |
| C. | Endoplasmic reticulum |
| D. | Ribosomes |
| Answer» B. Golgi apparatus | |
| 4796. |
Unit of nucleic acid is [BCECE 2005] |
| A. | Nucleotide |
| B. | Nucleoside |
| C. | Nucleic acid |
| D. | All |
| Answer» B. Nucleoside | |
| 4797. |
Which one of the following makes use of RNA as a template to synthesize DNA [CBSE PMT 2005] |
| A. | Reverse transcriptase |
| B. | DNA dependant RNA polymerase |
| C. | DNA polymerase |
| D. | RNA polymerase |
| Answer» B. DNA dependant RNA polymerase | |
| 4798. |
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by [CPMT 1992; AIIMS 1993; MP PMT 2000; BVP 2001; CBSE PMT 2005] |
| A. | (Base-sugar-phosphate)n |
| B. | Base-sugar-OH |
| C. | Base-sugar-phosphate |
| D. | Sugar-phosphate |
| Answer» D. Sugar-phosphate | |
| 4799. |
Which one of the following hydrolyses internal phosphodiester, bonds in a polynucletide chain [CBSE PMT 2005] |
| A. | Lipase |
| B. | Exonuclease |
| C. | Endonuclease |
| D. | Protease |
| Answer» D. Protease | |
| 4800. |
Choose the correct statement about the direction of DNA strand [MHCET 2004; BVP 2004] |
| A. | 5? ® 3? takes place on template strand |
| B. | 3? ® 5? takes place on new strand |
| C. | 5? ® 3? takes place on leading strand |
| D. | None of these |
| Answer» D. None of these | |