Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- The productivity of aquatic ecosystem is basically determined by light and____________? 

a. CO2  

b. O2  

c. Water  

d. Nutrients 


Answer- Nutrients


Que- The first layer of cell wall which is formed is___________? 

a. Primary wall  

b. Secondary wall  

c. Middle lamella  

d. All of these 


Answer- Primary wall


Que- Annual rainfall in grassland is about_____________? 

a. More than 2500 mm  

b. 750-1500 mm  

c. 250-750 mm  

d. Less than 250 mm 


Answer- 250-750 mm


Que- Conversion of ammonia or ammonium ion into nitrites during nitrogen cycle occurs due_____________? 

a. Rhizobium  

b. Nitrosomonas  

c. Nitrobacter  

d. Pseudomonas 


Answer- Nitrosomonas


Que- Cellulose is the major component of__________? 

a. Primary wall  

b. Secondary wall  

c. Middle lamella  

d. all of the above 


Answer- Primary wall


Que- Number of cervical vertebrae is_____________? 

a. 5.0 

b. 7.0 

c. 9.0 

d. 12.0 


Answer- 7.0


Que- Autophagosomes are____________? 

a. Those lysosomes which eat parts of their own cells to generate energy.  

b. Those lysosomes which eat old and worn out cellular organelles.  

c. Lysosomes which help in extracellular digestion  

d. Both a and b 


Answer- Both a and b


Que- Sapwood is formed from_____________? 

a. Primary xylem  

b. Secondary xylem  

c. Primary phloem  

d. Secondary phloem 


Answer- Secondary xylem


Que- Which of the following cytoskeletal fiber contain tubulin protein? 

a. One which help in assembly of spindles during mitosis.  

b. One involved in internal cell motion.  

c. One involved in maintenance of cell shape.  

d. Both b and c 


Answer- One which help in assembly of spindles during mitosis.


Que- Only myosine is present in_____________? 

a. A band  

b. 1 band  

c. H zone  

d. Sarcomere 


Answer- H zone


Que- Joints present in skull are example of_______________? 

a. Fibrous joints  

b. Cartilaginous joints  

c. Synovial Joints  

d. Slightly moveable joints 


Answer- Fibrous joints


Que- The human naked eye can differentiate between two points which are __________ apart? 

a. 1.0 mm  

b. 0.1 mm  

c. 1.0 cm  

d. 1.0 dm 


Answer- 1.0 mm


Que- _____________ is a nervous disorder characterized by involuntary tremors, diminished motor power and rigidity? 

a. Epilepsy  

b. Meningitis  

c. Alzheimer's disease  

d. Parkinson's disease 


Answer- Parkinson's disease


Que- Of the following which one is not the characteristic of mitochondria? 

a. It contains F1 particles  

b. It is involved in the synthesis of protein  

c. It is a self replicating organelle  

d. Number of mitochondria is constant 


Answer- Number of mitochondria is constant


Que- In human female, fertilization commonly occurs at______________? 

a. Proximal part of oviduct  

b. Distal part of oviduct  

c. Uterus  

d. Cervix 


Answer- Proximal part of oviduct


Que- The part of chloroplast where CO2 is fixed to manufacture sugar is__________? 

a. Stroma  

b. Grana  

c. Thylakoid  

d. Outer membrane 


Answer- Stroma


Que- Highest form of learning is__________________? 

a. Latent learning  

b. Insight learning  

c. Operant conditioning  

d. Instinct 


Answer- Insight learning


Que- Which of the following hormone is polypeptide in nature____________? 

a. Insulin  

b. Thyroxine  

c. ADH  

d. Cortisone 


Answer- ADH


Que- Ribosomes are assembled in__________? 

a. Nucleolus  

b. Nucleus  

c. DNA  

d. RNA 


Answer- Nucleolus


Que- Far-red light promotes flowering in_______________? 

a. Short day plant  

b. Long day plant  

c. Day neutral plant  

d. None of these 


Answer- Short day plant


Que- Which of the following is not present in mitochondria? 

a. Enzymes  

b. Co-enzymes  

c. Ribosomes  

d. Thylakoids 


Answer- Thylakoids


Que- Secretin inhibits production of__________________? 

a. Gastric juice  

b. Pancreatic juice  

c. Bile  

d. All of these 


Answer- Gastric juice


Que- Yellowish glandular structure which produces progesterone is_____________? 

a. Graffian follicle  

b. Ovary  

c. Corpus luteum  

d. Placenta 


Answer- Corpus luteum


Que- The stent energy in the form of ADP is regenerated by mitochondria into__________? 

a. AMP  

b. ADP  

c. ATP  

d. All of these 


Answer- ATP


Que- XO-XX pattern of sex determination is present in______________? 

a. Grasshopper  

b. Butterfly  

c. Drosophila  

d. Man 


Answer- Grasshopper


Que- On which of the following component of chloroplast chlorophyll is arranged? 

a. Cell membrane  

b. Matrix  

c. Thylakoids  

d. Stroma 


Answer- Thylakoids


Que- An example of codominance is______________? 

a. A' blood group  

b. B' blood group  

c. O' blood group  

d. AB' blood group 


Answer- AB' blood group


Que- Test cross is used to find_____________? 

a. Trait  

b. Phenotype  

c. Genotype  

d. Ratios 


Answer- Genotype


Que- Number of nuclear pores/nucleus in an RBC are_________? 

a. 1?3  

b. 3?4  

c. 10000.0 

d. 30000.0 


Answer- 3?4


Que- Yellow cytoplasm in ascidian gives rise to______________? 

a. Epidermis  

b. Muscle cells  

c. Gut  

d. Notochord 


Answer- Muscle cells


Que- Chlorophyll molecule contrains __________ as central metal ion. 

a. Fe2+  

b. Mg2+  

c. Zn2+  

d. Cu2+ 


Answer- Mg2+


Que- Okazaki fragments are connected together through action of_________________? 

a. Primase  

b. Polymerase  

c. Helicase  

d. Ligase 


Answer- Ligase


Que- Which of the following combination is an example of self replicating organelles? 

a. Mitochondria Ribosomes  

b. Mitochondria Nucleus  

c. Mitochondria Chloroplast  

d. Mitochondria Vacuole 


Answer- Mitochondria Chloroplast


Que- Which of the following is an autosomal disorder______________? 

a. Down's syndrome  

b. Klinifelter's syndrome  

c. Turner's syndrome  

d. Jacob's syndrome 


Answer- Down's syndrome


Que- The place of centromere where spindle fibres get attached is_________? 

a. Kinetochore  

b. Kinochore  

c. Centromere region  

d. all of these 


Answer- Kinetochore


Que- Embryonic induction is caused by part developing from_____________? 

a. Endoderm  

b. Ectoderm  

c. Mesoderm  

d. Extraembryonic layers 


Answer- Mesoderm


Que- Sickle cell anemia is an example of_________________? 

a. Chromosomal aberration  

b. Insertion of gene  

c. Deletion of gene  

d. Point mutation 


Answer- Point mutation


Que- The type of plastids which help in pollination is_________? 

a. Chromoplasts  

b. Leucoplasts  

c. Chloroplasts  

d. All of these 


Answer- Chromoplasts


Que- Purines and pyrimidines are in equal ration in DNA.It was indicated by_______________? 

a. F.Miescher  

b. Chargaff  

c. Watson & Crick  

d. Harshay & Chase 


Answer- Chargaff


Que- Chlorophyll is a/an _____ molecule? 

a. Inorganic  

b. Cationic  

c. Anionic  

d. Organic 


Answer- Organic


Que- Ribonucleo-protein particles are the name of__________? 

a. DNA  

b. Nucleus  

c. Eukaryotic ribosomes  

d. RNA 


Answer- Eukaryotic ribosomes


Que- Lock and Key model was proposed by______________? 

a. Emil Fischer  

b. Koshland  

c. Robin Williams  

d. Rudolph Virchow 


Answer- Emil Fischer


Que- Which step causes activation of catalytic site of an enzyme__________________? 

a. Change in pH of the surroundings.  

b. Formation of Enzyme Susstrate complex.  

c. Change in the charge of the active site.  

d. Change in temperature 


Answer- Formation of Enzyme Susstrate complex.


Que- Amoeboid movements and movement of cyclosis is due to_________? 

a. Microfilaments  

b. Microtubules  

c. Intermediate filaments  

d. Cytoskeleton 


Answer- Microfilaments


Que- Enzymes __________________ the activation energy of a chemical reaction? 

a. Increases  

b. Decreases  

c. Does not effect  

d. Increases or decreases depending upon individual enzyme 


Answer- Decreases


Que- Which one forms the raw material for coenzymes_______________________? 

a. Vitamins  

b. Carbohydrates  

c. Proteins  

d. Metals 


Answer- Vitamins


Que- Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________? 

a. Ribosomes  

b. Cytoplasm  

c. Golgi apparatus  

d. Endoplasmic reticulum 


Answer- Golgi apparatus


Que- Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________? 

a. Cofactor  

b. Coenzymes  

c. Activator  

d. Enzymes 


Answer- Enzymes


Que- In which of the following location enzymes controlling cellular respiration are present____________? 

a. Nucleus  

b. Chlorophast  

c. Milochondria  

d. Ribosome 


Answer- Milochondria


Que- In golgi apparatus the maturing face is____________? 

a. Biconcave  

b. Convex  

c. Spherical  

d. Concave 


Answer- Concave


Que- A cofactor made of inorganic ion which is detachable is called__________________? 

a. Prosthetic group  

b. Coenzyme  

c. Activator  

d. Cofactor 


Answer- Activator


Que- An activated enzyme consisting of polypeptide chain and a cofactor is called_______________? 

a. Apoenzyme  

b. Holoenzyme  

c. Activated enzyme  

d. Both b and c 


Answer- Both b and c


Que- Centrioles are composed of ________ triplets of microtubules. 

a. 3.0 

b. 9.0 

c. 10.0 

d. 15.0 


Answer- 9.0


Que- Which statement about enzyme is incorrect_________________? 

a. Some of them consist solely of protein with no non protein part.  

b. They catalyze a chemical reaction without being utilized.  

c. All enzymes are fibrous Proteins.  

d. They without their cofactor are called apoenzyme. 


Answer- All enzymes are fibrous Proteins.


Que- A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called_________________? 

a. Active site  

b. Binding site  

c. Catalytic site  

d. Allosteric site 


Answer- Active site


Que- Cellular organelles related with H2O2 are___________? 

a. Glyoxisomes  

b. Lysosomes  

c. Peroxisomes  

d. Ribosomes 


Answer- Peroxisomes


Que- If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________? 

a. There is probably more substrate present than there is enzyme.  

b. There is probably more enzayme available than there is substrate.  

c. There is probably more product present than there is either substrate or enzyme.  

d. The enzyme substrate complex is probably failing to form during the reaction 


Answer- There is probably more enzayme available than there is substrate


Que- A group of ribosomes attached to mRNA is known as___________? 

a. Polymer  

b. Polypeptide  

c. Polysomes  

d. Monomer 


Answer- Polysomes


Que- The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________? 

a. Increase in enzyme molecule increases the available active sites.  

b. This relation is for unlimited time period with unlimited enzyme concentration  

c. If the concentration is doubled the rate will become two fold.  

d. None of these. 


Answer- This relation is for unlimited time period with unlimited enzyme concentration


Que- Which statement is incorrect about Lock and Key Model________________? 

a. Specific enzyme can transform only a specific substrate  

b. Active site of an enzyme is a non flexible structure  

c. Active site does not change before during or even after the reaction  

d. It explains the mechanism of every chemical reaction 


Answer- It explains the mechanism of every chemical reaction


Que- If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________? 

a. Enzymes get denatured at higher substrate conc  

b. Rate of reaction is indirectly proportional to substrate concentration at this point  

c. All the active sites on enzyme molecule are occupied  

d. None of these 


Answer- All the active sites on enzyme molecule are occupied


Que- The active site of an enzyme______________? 

a. Never changes  

b. Forms no chemical bond with substrate  

c. Determined by structure and the specificity of the enzyme  

d. They are non specific in their action 


Answer- Determined by structure and the specificity of the enzyme


Que- Factory of Ribosomal systhesis is__________? 

a. Cytoplasm  

b. Nucleus  

c. Nucleolus  

d. Endoplasmic reticulum 


Answer- Nucleolus


Que- If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________? 

a. Saturation  

b. Denaturation  

c. Composition  

d. Inhibition 


Answer- Saturation


Que- Who opposed the idea the cell is an empty space bounded by thick wall? 

a. Lorenz Oken  

b. Schwann  

c. Robert Brown  

d. Rudolph Virchow 


Answer- Robert Brown


Que- Extreme change in pH results in______________? 

a. Change in ionization of amino acids at the active site of the enzyme  

b. Change in the ionization of the substrate  

c. Denaturation of the enzyme  

d. Increase in the reaction rate 


Answer- Denaturation of the enzyme


Que- Resolution power of a compound microscope is___________? 

a. 2.0 ?m  

b. 2-4 A  

c. 24 ?m  

d. 24 A 


Answer- 2.0 ?m


Que- Excessive increase in temperature of medium causes the enzyme molecule to____________? 

a. Activate  

b. Unaffected  

c. Denatured  

d. None of these 


Answer- Denatured


Que- If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________? 

a. increase in concentration of enzyme  

b. increase in concentration of substrate  

c. increase in pH  

d. increase in temperature 


Answer- increase in concentration of enzyme


Que- In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________? 

a. Their physical properties like size & weight.  

b. Physical properties of the medium like its density.  

c. Their electrical properties like their charges  

d. Both a and b 


Answer- Both a and b


Que- The structure of an enzyme is altered by____________? 

a. Irreversible inhibitor  

b. Reversible inhibitor  

c. Competitive inhibitor  

d. Non-competitive inhibitor 


Answer- Irreversible inhibitor


Que- Malonic acid is an example of____________? 

a. Irreversible inhibitor  

b. Reversible inhibitor  

c. Competitive inhibitor  

d. Non-competitive inhibitor 


Answer- Competitive inhibitor


Que- Magnifying power of electron microscope as compared to eye is____________? 

a. 500 X  

b. 250000X  

c. 500000X  

d. 250X 


Answer- 250000X


Que- Inhibitors which block the enzyme by forming weak bond are called___________? 

a. Competitive inhibitors.  

b. Non-competitive inhibitors  

c. Irreversible inhibitors.  

d. Both a and b 


Answer- Both a and b


Que- Which of the statement about cell membrane is not true? 

a. It contains protein molecules embedded in lipid bilayer  

b. It is a differentially permeable membrane.  

c. It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.  

d. It may get infolded to engulf solid or liquid material. 


Answer- It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.


Que- A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________? 

a. Irreversible inhibitor  

b. Reversible inhibitor  

c. Competitive inhibitor  

d. Non-competitive inhibitor 


Answer- Competitive inhibitor


Que- A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________? 

a. Co-enzyme  

b. Blocker  

c. Inhibitor  

d. Cofactor 


Answer- Inhibitor


Que- Optimal temperature of enzymes present in human body is_____________? 

a. 27?C  

b. 37?C  

c. 47?C  

d. 30?C 


Answer- 37?C


Que- Strengthening material of prokaryotic cell wall is__________? 

a. Cellulose  

b. Chitin  

c. Inorganic salts silica waxes and ligin  

d. Peptidoglycan or Murein. 


Answer- Peptidoglycan or Murein.


Que- Spherical or tubular membranes which separate the material present in endoplasmic reticulum from that of cytoplasmic material are called__________? 

a. Cytosol  

b. Cisternae  

c. Polysomes  

d. Cristae 


Answer- Cisternae


Que- Whone is not the function of endoplasmic reticulum? 

a. Nerve impulse conduction  

b. Transport of material  

c. Mechanical support  

d. Synthesis of conjugated molecules 


Answer- Synthesis of conjugated molecules


Que- 60S and 40S subunit combine to form ________ particle. 

a. 100 S  

b. 90 S  

c. 80 S  

d. 70 S 


Answer- 80 S


Que- Pancreas produces secretory granules that help in digestion. These granules after passing through endoplasmic reticulum are pinched off from ________ surface of Golgi apparatus: 

a. Forming face  

b. Maturating face  

c. Any of them  

d. None of these 


Answer- Maturating face


Que- Which of the following statement is incorrect about Glyoxisomes? 

a. They contain enzymes which help in conversion of fatty acids into carbohydrate  

b. They are abundant in soyabeans but absent in pea.  

c. They are present through out life of a plant and provide them whth energy through Glyoxylate cycle.  

d. They are signle membranous organelles 


Answer- They are present through out life of a plant and provide them whth energy through Glyoxylate cycle.


Que- Ribosomes + m-RNA? 

a. Polysome  

b. Phlosome  

c. Polosome  

d. None of these 


Answer- Polysome


Que- Which of the following impart a red colour to Rose petals? 

a. Chloroplast  

b. Chlorophyll  

c. Chromoplast  

d. Leucoplast 


Answer- Chromoplast


Que- During digesting the phagocytosed food particles vesicles formed from fusion of phagocytic vacuole with the enzymes secreted by Golgi apparantus are called_______? 

a. Lysosomes  

b. Primary lysosomes  

c. Secondary lysosomes  

d. Food vacuole 


Answer- Secondary lysosomes


Que- The bond formed when two or more atoms complete their electron shells by sharing electrons is called_____________? 

a. Ionic bond  

b. Hydrogen bond  

c. Covalent bond  

d. Electrovalent bond 


Answer- Covalent bond


Que- Which one is the basic element of organic compounds _________________? 

a. Oxygen  

b. Hydrogen  

c. Sulphur  

d. Carbon 


Answer- Carbon


Que- Reactions in which simple substances are combined to form complex substances are called_____________? 

a. Metabolic reactions  

b. Catabolic reactions  

c. Anabolic reactions  

d. None of these 


Answer- Anabolic reactions


Que- Which chemical component has the same % in bacterial as well as the mammalian cell_____________? 

a. Water  

b. Carbohydrate  

c. Proteins  

d. Lipids 


Answer- Water


Que- The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called_________________? 

a. Chemistry  

b. Biochemistry  

c. Molocular biology  

d. Both a and b 


Answer- Biochemistry


Que- Which chemical component has the greatest contribution in the total mammalian cell weight__________? 

a. Proteins  

b. Carbohydrate  

c. Lipids  

d. Water 


Answer- Water


Que- Which one is an organic compound_____________? 

a. CO2  

b. Water  

c. Lipids  

d. HCI 


Answer- Lipids


Que- Carbon atom is_____________? 

a. Monovalent  

b. Divalent  

c. Trivalent  

d. Tetravalent 


Answer- Tetravalent


Que- The property of water due to which it works as a temperature stabilizer and hence protect living organisms from sudden thermal changes is_______________? 

a. High specific heat of vaporization  

b. High specific heat capacity  

c. Its Dipole nature  

d. Its liquid state 


Answer- High specific heat capacity


Que- The number of calories required to raise the temperature of 1g of water from 15 to 16?C is called___________? 

a. Specific Heat of Vaporization  

b. Specific Heat capacity  

c. Caloric Heat  

d. Both A and C 


Answer- Specific Heat capacity


Que- The one which is present in all living things is ___________? 

a. Cell nucleus  

b. DNA or RNA  

c. Cell membrane  

d. Vacuole 


Answer- DNA or RNA


Que- The mechanism of stomatal movement is related to the branch of Biology called__________? 

a. Taxonomy  

b. Physiology  

c. Morphology  

d. Anatomy 


Answer- Physiology


Que- Which of the following substance is most favorable to form structural component of biological membranes___________? 

a. Hydrophilic Carbohydrates  

b. Hydrophobic fats.  

c. Both a and b  

d. None of these 


Answer- Hydrophobic fats

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