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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