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MCQOPTIONS
This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 2651. |
Which are the structural units of DNA? |
| A. | Nitrogen base |
| B. | Pentose sugar |
| C. | nucleotide |
| D. | phosphoric acid |
| Answer» D. phosphoric acid | |
| 2652. |
Nucleic acids are related with which activity? |
| A. | Digestion |
| B. | Respiration |
| C. | Reproduction |
| D. | Heredity |
| Answer» E. | |
| 2653. |
Nucleic acids are polymers of which molecules? |
| A. | Nucleosides |
| B. | Nucleotides |
| C. | Polypeptides |
| D. | polysomes |
| Answer» C. Polypeptides | |
| 2654. |
The illustration given below is which nitrogen base: |
| A. | Guanine |
| B. | Cytosine |
| C. | Uracil |
| D. | Adenine |
| Answer» E. | |
| 2655. |
Which of the following will be characteristically different in different living organism? |
| A. | Protein |
| B. | Nucleic acid |
| C. | Enzyme |
| D. | Carbohydrate |
| Answer» C. Enzyme | |
| 2656. |
Chemically DNA differs from RNA by: |
| A. | Thymine and deoxyribose present in DNA and Uracil and ribose in RNA |
| B. | Uracil and deoxyribose in DNA and thymine and ribose in RNA |
| C. | Deoxyribose in DNA and ribose in RNA |
| D. | Two nucleotide in DNA and one nucleotide in RNA |
| Answer» B. Uracil and deoxyribose in DNA and thymine and ribose in RNA | |
| 2657. |
Which one of the following is the major component of chromosome? |
| A. | Nucleic acid |
| B. | Protein |
| C. | Nitrogen base |
| D. | Lipid |
| Answer» B. Protein | |
| 2658. |
Nucleic acid contains which group of molecules in their constitution? |
| A. | C, H, N and S |
| B. | C, H, O, N and S |
| C. | C, H, N, O, and P |
| D. | C, H, N and O |
| Answer» D. C, H, N and O | |
| 2659. |
A DNA stand is directly involved in the synthesis of all the following except – |
| A. | Another DNA Stand |
| B. | t- RNA |
| C. | m-RNA |
| D. | Protein |
| Answer» E. | |
| 2660. |
What is Guanine? |
| A. | Purine |
| B. | Hormone |
| C. | Enzyme |
| D. | Pyrimidine |
| Answer» B. Hormone | |
| 2661. |
Which two sequential carbon number of nucleotides join through phosphodiaster bond? |
| A. | 3 and 5 |
| B. | 1 and 4 |
| C. | 1 and 6 |
| D. | 2 and 5 |
| Answer» B. 1 and 4 | |
| 2662. |
The hydrogen bonds between adenine and guanine are |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| Answer» E. | |
| 2663. |
The classification of the protein in two types depends on |
| A. | Structure and function |
| B. | Types of amino acid |
| C. | Numbers of amino acid |
| D. | none above |
| Answer» B. Types of amino acid | |
| 2664. |
Which is longest of all RNA? |
| A. | m-RNA |
| B. | t-RNA |
| C. | r-RNA |
| D. | None above |
| Answer» B. t-RNA | |
| 2665. |
Nucleic acids means |
| A. | A major components of chromosomes |
| B. | Polynucleotide of structural units known as nucleotides |
| C. | Small gene carrying bodies in the nuclei of complex cells |
| D. | Both a & b |
| Answer» E. | |
| 2666. |
What ‘A’ and ‘B’ indicates in the given structure? |
| A. | A= CH2, B= N |
| B. | A= (>C=0), B= NH |
| C. | A= NH, B= NH |
| D. | A=NH2, B=NH |
| Answer» E. | |
| 2667. |
The DNA stands are antiparallel because of: |
| A. | Ester bond |
| B. | Phosphodiester bond |
| C. | Disulphide bond |
| D. | Hydrogen bond |
| Answer» C. Disulphide bond | |
| 2668. |
m-RNA is the polymer of |
| A. | Ribonucleotide |
| B. | Ribonucleoside |
| C. | Deoxyribonucleotide |
| D. | Ribosome |
| Answer» B. Ribonucleoside | |
| 2669. |
The distance between two chains of DNA molecules is: |
| A. | 34 A° |
| B. | 20 A° |
| C. | 3.4 A° |
| D. | 10 A° |
| Answer» C. 3.4 A° | |
| 2670. |
Which one is known as adapter molecule? |
| A. | DNA |
| B. | m-RNA |
| C. | t-RNA |
| D. | r-RNA |
| Answer» D. r-RNA | |
| 2671. |
Which one is two ringed nitrogenous base? |
| A. | Thymine |
| B. | Adenine |
| C. | Cytosine |
| D. | Uracil |
| Answer» C. Cytosine | |
| 2672. |
The common instant source of energy of cellular activities is |
| A. | Mitochondria |
| B. | DNA |
| C. | RNA |
| D. | ATP |
| Answer» E. | |
| 2673. |
The length of one complete spiral of DNA is: |
| A. | 34 A° |
| B. | 3.4 A° |
| C. | 20 A° |
| D. | 340 A° |
| Answer» B. 3.4 A° | |
| 2674. |
Mention the example of dinuclotide in the given structure. |
| A. | RNA with UA |
| B. | RNA with CG |
| C. | DNA with TA |
| D. | DNA with CG |
| Answer» B. RNA with CG | |
| 2675. |
The structure of DNA like a spiral ladder because |
| A. | Purine and Pyrimidine are on the opposite side |
| B. | Purine and Pyrimidine linked with hydrogen bond |
| C. | All nucleotides join through a phosphodiester bond |
| D. | Two polynucleotide chains arranged parallel to each other and are spirally Twisted |
| Answer» E. | |
| 2676. |
Which is the part of DNA molecules that varies among DNA molecule |
| A. | Pentose sugar |
| B. | nitrogen base |
| C. | phosphate |
| D. | a & b both |
| Answer» C. phosphate | |
| 2677. |
Which is the site of protein synthesis? |
| A. | Chromosomes |
| B. | DNA |
| C. | Polysomes |
| D. | Tonoplast |
| Answer» D. Tonoplast | |
| 2678. |
Nitrogen bases do not contain |
| A. | Phosphorus |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | Carbon |
| Answer» B. Nitrogen | |
| 2679. |
Select the specific base pairs of DNA: |
| A. | Adenine and Cytosine |
| B. | Guanine and Adenine |
| C. | Adenine and Thymine |
| D. | Guanine and Uracil |
| Answer» D. Guanine and Uracil | |
| 2680. |
Which of the following ratio is constant in the DNA of all the species? |
| A. | A+U / T+C |
| B. | A+G/ C+T |
| C. | A+C / T+G |
| D. | A+T / C+G |
| Answer» E. | |
| 2681. |
Which one of the following bases is found only in RNA and not in DNA? |
| A. | Guanine |
| B. | Adenine |
| C. | Uracil |
| D. | Thymine |
| Answer» D. Thymine | |
| 2682. |
Which are proportionally more compounds in all RNA’s? |
| A. | m-RNA |
| B. | t-RNA |
| C. | r-RNA |
| D. | a, b, c all |
| Answer» D. a, b, c all | |
| 2683. |
The scientists who discovered the structure of DNA molecule |
| A. | Miller and mandal |
| B. | Khorana and Nirenberg |
| C. | Calvin and Wilkinson |
| D. | Waston and Crick |
| Answer» E. | |
| 2684. |
Which is the special function of t-RNA? |
| A. | Pick up code for m-RNA and bring it to r-RNA |
| B. | Do protein synthesis |
| C. | Carries the coded genetic information in to the cytoplasm |
| D. | An adapter for attaching amino acid to m-RNA template during Protein synthesis |
| Answer» E. | |
| 2685. |
Match the column and find out the correct combination |
| A. | P-v, Q-iii, R-ii, S-i, T-iv |
| B. | P-v, Q-iii, R-iv, S-I, T-ii |
| C. | P-iii, Q-v, R-i, S- ii, T-iv |
| D. | P-v, Q-i, R-ii, S-iii, T-iv |
| Answer» B. P-v, Q-iii, R-iv, S-I, T-ii | |
| 2686. |
A molecule of ATP is structurally most similar to a molecule of? |
| A. | RNA |
| B. | Protein |
| C. | Lipid |
| D. | Amino acid |
| Answer» B. Protein | |
| 2687. |
which kind of arrangement lies in the two polynucleotide chain of DNA? |
| A. | Antiparallel and complementary |
| B. | parallel and complementary |
| C. | Independent |
| D. | None above |
| Answer» B. parallel and complementary | |
| 2688. |
The enzyme which removes hydrogen from the substrate is known as: |
| A. | Oxido-reductase |
| B. | Dehydrogenase |
| C. | Hydrogenase |
| D. | Hydrolyses |
| Answer» C. Hydrogenase | |
| 2689. |
The RNA transporting amino acid to the protein synthesizing site known as |
| A. | t-RNA |
| B. | r-RNA |
| C. | m-RNA |
| D. | Any one of a, b, c |
| Answer» B. r-RNA | |
| 2690. |
Enzymes are named after their substrate adding suffix – |
| A. | —- In |
| B. | — ase |
| C. | — ose |
| D. | — on |
| Answer» C. — ose | |
| 2691. |
What is Ribozymes? |
| A. | Only nucleic acids |
| B. | ony protein |
| C. | Some nucleic acids that behave like enzyme |
| D. | M ore than one Ribosome |
| Answer» D. M ore than one Ribosome | |
| 2692. |
Which one is not correct for enzyme? |
| A. | They all are biocatalysts |
| B. | They all are colloidal |
| C. | They all are proteins |
| D. | All proteins are enzymes |
| Answer» E. | |
| 2693. |
Enzymes are polymers of: |
| A. | Fatty acid |
| B. | Phosphate |
| C. | Amino acid |
| D. | Nucleotides |
| Answer» D. Nucleotides | |
| 2694. |
An enzyme brings about |
| A. | Activation energy level |
| B. | Increase in reaction time |
| C. | Decrease in activation energy level |
| D. | all above |
| Answer» D. all above | |
| 2695. |
Which one of the following chemical is classified as an enzyme? |
| A. | Try glyceride |
| B. | Cellulose |
| C. | Galactose |
| D. | Sucrase |
| Answer» E. | |
| 2696. |
Enzyme and substrate complementary each other such as |
| A. | Pencil & eraser |
| B. | Pen & Paper |
| C. | Lock & key |
| D. | all above |
| Answer» D. all above | |
| 2697. |
Which one property is not true for enzyme? |
| A. | It effective for one reaction is not useful in another reaction |
| B. | It is amphoteric in nature |
| C. | All enzymes are bidirectional |
| D. | They are not destroyed |
| Answer» D. They are not destroyed | |
| 2698. |
What is enzyme? |
| A. | All proteins which are in all living cell |
| B. | Chemicals which act as biological catalysts |
| C. | All amino acid which are in polypeptide chain |
| D. | All above |
| Answer» C. All amino acid which are in polypeptide chain | |
| 2699. |
Which of the following is not true for enzyme |
| A. | Water soluble and colloidal in nature |
| B. | Lowers the activation energy level |
| C. | Used up in the biochemical reaction |
| D. | Affected by the change in temperature |
| Answer» D. Affected by the change in temperature | |
| 2700. |
A temperature change from 30o |
| A. | Increase |
| B. | Decrease |
| C. | First increase and then decrease |
| D. | First decrease and then increase |
| Answer» D. First decrease and then increase | |