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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.
| 2001. |
Study the given statements and select the option. (i) Nitrogen bases are open chain hydrocarbons. (ii) A nucleoside differ from nucleotide in not having phosphate. (iii) One turn of B-DNA has ten base pairs. (iv) Length of one turn of DNA is 3.4 A. |
| A. | (i) and (ii) are correct. |
| B. | (i) and (iv) are correct. |
| C. | (ii) and (iii) are incorrect. |
| D. | (i) and (iv) are incorrect. |
| Answer» E. | |
| 2002. |
Identify the following molecule. |
| A. | Phospholipid |
| B. | Lecithin |
| C. | Cholesterol |
| D. | Oleic acid |
| Answer» D. Oleic acid | |
| 2003. |
Match the column-I (Component) with column-II (% of the total cellular mass) and identify the correct options. Column-I (Component) Column-II (% of the total cellular mass) A. Water I. 3 B. Proteins II. 70-90 C. Carbohydrates III. 2 D. Lipids IV. 5-7 E. Nucleic acids V. 10-15 |
| A. | A-V; B-II; C-III; D-IV; E-I |
| B. | A-II; B-V; C-I; D-III; E-IV |
| C. | A-III; B-I; C-IV; D-V; E-II |
| D. | A-V; B-IV; C-III; D-II; E-I |
| Answer» C. A-III; B-I; C-IV; D-V; E-II | |
| 2004. |
Keratin is: |
| A. | Tripeptide |
| B. | Chromoprotein |
| C. | Fibrous protein |
| D. | Conjugate protein |
| Answer» D. Conjugate protein | |
| 2005. |
Long chain molecules of fatty acids are formed by: |
| A. | polymerisation of 2-carbon compounds |
| B. | decomposition of fats |
| C. | polymerisation of glycogen |
| D. | conversion of glycogen |
| Answer» B. decomposition of fats | |
| 2006. |
Raffinose is a: |
| A. | Trisaccharide |
| B. | Disaccharide |
| C. | Polysaccharide |
| D. | Monosaccharide |
| Answer» B. Disaccharide | |
| 2007. |
If base order in one chain of DNA is "ATCGA" then how many no. of H-bond found in DNA duplex? |
| A. | 20 |
| B. | 12 |
| C. | 10 |
| D. | 11 |
| Answer» C. 10 | |
| 2008. |
All the following radio nuclei are used in the study of DNA except: |
| A. | \[^{14}C\] |
| B. | \[^{32}P\] |
| C. | \[^{15}N\] |
| D. | \[^{51}Cr\] |
| Answer» E. | |
| 2009. |
Denaturation of DNA is accompanied by the following changes except: |
| A. | Increase in viscosity |
| B. | Hyperchromicity |
| C. | Unstacking of bases |
| D. | Destabilisation of DNA helix |
| Answer» B. Hyperchromicity | |
| 2010. |
Match Column-I with Column-II and select the correct answer using the codes given below. Column-I Column-II A. Collagen I. Glucose transport B. Trypsin II. Binding with some chemical like for small taste and hormones C. Trypsin III. Homones D. Marasmus IV. Enzyme E. Bleeding V. Intercellular ground substance F. GLUT-IV VI VI. Fight infectious agents |
| A. | A-V; B-IV; C-III; D-VI; E-II; F-I |
| B. | A-II; B-III; C-IV; D-V; E-VI; F-I |
| C. | A-VI; B-II; C-I; D-V; E-VI; F-III |
| D. | A-I; B-IV; C-III; D-VI; E-II; F-V |
| Answer» B. A-II; B-III; C-IV; D-V; E-VI; F-I | |
| 2011. |
Deionised water is obtained by passing hard water through: |
| A. | Zeolite |
| B. | Cation exchanger |
| C. | Anion exchanger |
| D. | Both cation and anion exchanger |
| Answer» E. | |
| 2012. |
Iron porphyrin occurs in: |
| A. | Cytochrome |
| B. | Phytochrome |
| C. | Anthocyanin |
| D. | Both [b] and [c] |
| Answer» B. Phytochrome | |
| 2013. |
One of the following proteins does not have a quaternary structure. |
| A. | Hemoglobin |
| B. | Myoglobin |
| C. | Lactate dehydrogenase |
| D. | Immunoglobin G |
| Answer» C. Lactate dehydrogenase | |
| 2014. |
Which one of the given graph shows the effect of pH on the velocity of a typical enzymatic reaction (V)? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» D. | |
| 2015. |
The base pairs of DNA are correctly shown as: |
| A. | A=T and C=G |
| B. | A=T and C=G |
| C. | A=T and C=G |
| D. | A=T and C=G |
| Answer» D. A=T and C=G | |
| 2016. |
All the following statements are true with regard to coconut oil, except: |
| A. | it is composed of medium chain triglycerides. |
| B. | it contains mainly saturated fatty acids. |
| C. | it has a higher iodine number than human fat. |
| D. | it contains cholesterol. |
| Answer» E. | |
| 2017. |
Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these: |
| A. | enhance oxidative metabolism. |
| B. | are conjugated proteins. |
| C. | are exclusively synthesised in the body of a living organism. |
| D. | help in regulating metabolism. |
| Answer» E. | |
| 2018. |
phospholipids are: |
| A. | Hydrophilic |
| B. | Amphibolic |
| C. | Hydrophobic |
| D. | Amphipathic |
| Answer» E. | |
| 2019. |
The bacterium Bacillus thuringiensis can withstand heating, dryness, and toxic chemicals that would kill most other bacteria. This indicates that it is probably able to form: |
| A. | Pseudopodia |
| B. | Endotoxins |
| C. | Endospores |
| D. | Pili |
| Answer» D. Pili | |
| 2020. |
A tooth scraping yields large numbers of corkscrew shaped bacteria. These bacteria are referred to as: |
| A. | Bacilli |
| B. | Cocci |
| C. | Spirilli |
| D. | Helici |
| Answer» D. Helici | |
| 2021. |
Ergot is caused by: |
| A. | Claviceps |
| B. | Penicillium |
| C. | Aspergillus |
| D. | Rhizobium |
| Answer» B. Penicillium | |
| 2022. |
When fungi feed on dead organic matter, they are known as: |
| A. | Dimorphic |
| B. | Parasites |
| C. | Saprophytes |
| D. | None of these |
| Answer» D. None of these | |
| 2023. |
Match the following columns. Column - I Column - II A. Rod-shaped I. Coccus B. Spherical II. Bacillus C. Spiral-shaped III. Vibrio D. Comma-shaped IV. Spirrillum |
| A. | A-III B-II C-I D-IV |
| B. | A-IV B-III C-II D-I |
| C. | A-II B-I C-IV D-III |
| D. | A-I B-IV C-III D-II |
| Answer» D. A-I B-IV C-III D-II | |
| 2024. |
Which of the following statements is not correct for viruses? |
| A. | Viruses are obligate parasites. |
| B. | Viruses can multiply only when they are inside the living cells. |
| C. | Viruses cannot pass through bacterial filters. |
| D. | Viruses are made up of protein and DNA or RNA (never both DNA and RNA). |
| Answer» D. Viruses are made up of protein and DNA or RNA (never both DNA and RNA). | |
| 2025. |
Which of the following fixes atmospheric N? |
| A. | Nostoc |
| B. | Algae |
| C. | Methanogens |
| D. | None of these |
| Answer» B. Algae | |
| 2026. |
Common bread mold is: |
| A. | Yeast |
| B. | Rhizopus |
| C. | Bacteria |
| D. | Virus |
| Answer» C. Bacteria | |
| 2027. |
Archaea differ from eubacteria in which one of the following features? |
| A. | They have a rigid wall. |
| B. | Their cell wall lacks peptidoglycan component. |
| C. | They have 16s rRNA. |
| D. | They are very ancient. |
| Answer» C. They have 16s rRNA. | |
| 2028. |
Viruses that infect bacteria, multiply and cause their lysis, are called: |
| A. | Lysozymes |
| B. | Lipolytic |
| C. | Lytic |
| D. | Lysogenic |
| Answer» D. Lysogenic | |
| 2029. |
Cyanobacteria are: |
| A. | mosses which attack bacteria |
| B. | bacteria which attack cyanophyceae |
| C. | autotrophic organisms with phycocyanin |
| D. | None of the above |
| Answer» D. None of the above | |
| 2030. |
Infective stage of Entamoeba histolytica is: |
| A. | Trophozoite |
| B. | Pre cyst |
| C. | Uninucleate cyst |
| D. | Tetranucleate cyst |
| Answer» E. | |
| 2031. |
Enveloped virus infects/enters the host cell through: |
| A. | Direct penetration |
| B. | Injecting nucleic acid |
| C. | Endocytosis |
| D. | Endocytosis through chemical stimulators |
| Answer» C. Endocytosis | |
| 2032. |
The given figure shows some structures labelled as 1, 2, 3 and 4. Which structure has the protein coat that encloses the nucleic acid? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 2033. |
Which protist reproduces both by binary fission and conjugation? |
| A. | Amoeba |
| B. | Paramoecium |
| C. | Euglena |
| D. | Monocystis |
| Answer» C. Euglena | |
| 2034. |
Match the terms given in column-I with their examples given in column-II and choose the correct option. A. Ascus I. Spirulina B. Basidium II. Penicillium C. Protista III. Agaricus D. Cyanobacteria IV. Euglena E. Animalia V. Sponges |
| A. | A-II B-III C-IV D-V E-I |
| B. | A-I B-II C-III D-V E-IV |
| C. | A-II B-V C-III D-I E-IV |
| D. | A-II B-III C-IV D-I E-V |
| Answer» E. | |
| 2035. |
The genetic material in viruses is/are: |
| A. | Only RNA |
| B. | Only DNA |
| C. | RNA and DNA both |
| D. | RNA or DNA i. e. one nucleic acid in a virus |
| Answer» E. | |
| 2036. |
Natural system of classification differs from artificial system in: |
| A. | employing only one floral trait |
| B. | taking only one vegetative trait |
| C. | bringing out similarities and dissimilarities |
| D. | developing evolutionary trends |
| Answer» D. developing evolutionary trends | |
| 2037. |
The conditions which would be favoured by thermoacidophiles are: |
| A. | Hot and alkaline |
| B. | Snow and acidic |
| C. | Hot sulphur spring |
| D. | Gut of cows |
| Answer» D. Gut of cows | |
| 2038. |
Most of the antibiotics have no effect on viruses because: |
| A. | they kill all bacteria which form host of virus. |
| B. | viruses are too small in size for antibiotics to act on them. |
| C. | viruses have no metabolism of their own. |
| D. | viruses produce a thick covering and endospores. |
| Answer» D. viruses produce a thick covering and endospores. | |
| 2039. |
LPP-1 is a: |
| A. | Bacterium |
| B. | Fungus |
| C. | Bacteriophage |
| D. | Cyanophage |
| Answer» E. | |
| 2040. |
The main difference between Gram positive and Gram negative bacteria lies in the composition of: |
| A. | Cilia |
| B. | Cell wall |
| C. | Nucleolus |
| D. | Cytoplasm |
| Answer» C. Nucleolus | |
| 2041. |
The cell wall of fungi is made up of: |
| A. | Chitin |
| B. | Cellulose |
| C. | Pectin |
| D. | Suberin |
| Answer» B. Cellulose | |
| 2042. |
Match column-I with column-II and select the correct answer using the codes given below. Column-I Column-II A. Streptomyces I. Food poisoning B. Rhizobium II. Source of antibiotics C. Nitrosomonas III. Nitrogen fixation D. Acetobacter IV. Nitrification V. Vinegar synthesis |
| A. | A-II B-III C-I D-V |
| B. | A-II B-III C-IV D-V |
| C. | A-IV B-V C-I D-III |
| D. | A-V B-I C-III D-IV |
| Answer» C. A-IV B-V C-I D-III | |
| 2043. |
Read the following statements and answer the question.(i) Some members are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling.(ii) They reproduce only by asexual spores known as conidia.(iii) Mycelium is septate and branched.(iv) Altemaria, Colletotrichum and Trichoderma are examples of this class.Which of the following class of fungi is being described by the above statements? |
| A. | Phycomycetes |
| B. | Deuteromycetes |
| C. | Basidiomycetes |
| D. | Ascomycetes |
| Answer» C. Basidiomycetes | |
| 2044. |
Plasmodium, the parasite, belongs to class: |
| A. | Sarcodina |
| B. | Ciliata |
| C. | Sporozoa |
| D. | Dinophyceae |
| Answer» D. Dinophyceae | |
| 2045. |
The phylogenetic system of classification was put forth by: |
| A. | Carolus Linnaeus |
| B. | George Bentham and Joseph Dalton Hooker |
| C. | Theophrastus |
| D. | Adolf Engler and Karl PrantI |
| Answer» E. | |
| 2046. |
An organism having cytoplasm, DNA and RNA but no cell wall is: |
| A. | Cyanobacterium |
| B. | Mycoplasma |
| C. | Bacterium |
| D. | Virus |
| Answer» C. Bacterium | |
| 2047. |
Which of the following statements is correct for both blue-green algae and bacteria? |
| A. | Both show anaerobic respiration. |
| B. | Both have chlorophyll pigment. |
| C. | Both are devoid of true nucleus. |
| D. | None of the above |
| Answer» D. None of the above | |
| 2048. |
In manufacturing of bread, it becomes porous due to release of \[C{{O}_{2}}\] by the action of: |
| A. | Virus |
| B. | Yeast |
| C. | Bacteria |
| D. | Protozoans |
| Answer» C. Bacteria | |
| 2049. |
If the generation time of a bacterium is 40 minutes and a culture containing \[{{10}^{7}}\] cells/ml is grown for 4 hours, then calculate its population after that period. |
| A. | \[64\times {{10}^{7}}\] |
| B. | \[32\times {{10}^{7}}\] |
| C. | \[6\times {{10}^{7}}\] |
| D. | \[40\times {{10}^{7}}\] |
| Answer» B. \[32\times {{10}^{7}}\] | |
| 2050. |
Smallest virus is: |
| A. | Foot and Mouth virus |
| B. | Alfalfa Mosaic virus |
| C. | Pseudomonas |
| D. | TMV |
| Answer» B. Alfalfa Mosaic virus | |