MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Plant Science - Term coined by


Term coined by
1. The term Meiosis was given by:
a)A Fleming
b)Frame  and Moore
c)Johansen
d)Knoll and Ruska

2.The term “antibiotic” was coined by
 a)Edward Jenner
b)Louis Pasteur
c)Selman Waksman
d)Alexander Fleming
MCQ on Plant Science - Term coined by

3. The term ‘protoplasm’ was given by
a)Fischer
b)Purkinje
c)Brown
d)Dujardine

4. The term mutation was introduced by
a)Darwin
b) Mendel
c)Hugo de vries
d)Lamark

5. The term ‘guttation’ was coined by
a)Kramer
b)Priestley
c)Stephan Hales
d)Bergerstein

6. The term ‘gene’ was introduced by
a)Bateson
b)Johnnsen
c)Mendel
d)Morgan

7.The term ecosystem was first coined by
 a)odum
b)Tansley
c)Reiter
d)None of these

8.The term ‘chromatophore’ was coined by
 a)Schmitz
b)WPfeiffer
c)Singer and Nocolson
d)Comparethi

9.The term ‘cytoplasm’ and ‘nuceloplasm’ were given by
a)Purkinje
b)Strasburger
c)Brown
d)Fleming

10.The term mitochondria was given by
a)Benda
b)Palade
c)de Duve
d)Altmann
Answers
1. b)Frame  and Moore
2. c)Selman Waksman
3. b)Purkinje
4. c)Hugo de vries
5. d)Bergerstein
6. b)Johnnsen
7. b)Tansley
8. a)Schmitz
9. b)Strasburger
10.a)Benda
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MCQ on Human Diseases

1. Bone cancer belongs to the category
a) carcinoma
b) malignant lymphoma
c) sarcoma
d)leukemia

2. Which one is correctly matched?
a) oncogenes- ageing
b) AIDS virus-reverse transcriptase
c)replication fork-mRNA
d)initiation factors-amino acid activation

3. Eruptive diseases are
a) mumps and measles
b) mumps and poliomyelitis
c) measles and chickenpox
d) poliomyelitis and syphilis

4. Jaundice, a physiological disease of liver is commonly due to
a) bacterium
b) helminth
c) protozoan 
d) virus
MCQ on Human Diseases

5. Rheumatic heart disease is caused by
a)repeated fever
b) cox sakieB 4 virus
c) streptococcal infection
d) all of these

6. Presence of RBC in urine is
a) nephritis
b)hemauria
c)protonuria
d)hematuria

7. Different species of Mycobacterium cause
a)Syphilis and Diphtheria
b)Whooping cough and leprosy
c)Tuberculosis and Leprosy
d)Syphilis and Gonorrhea

8. Which of the following is a cancerous disease?
a)angina pectoris
b)epidemic jaundice
c)leukemia
d) all of the above

9. Which one of the following is the second biggest cancer among women after breast cancer?
a)cancer of ovary
b)cancer of ovary
c)cancer of cervix
d)cancer of mouth

10. In leukemia there is tremendous increase in the numbers of
 a)red blood corpuscles
b)immature cells
c)white blood corpuscles
d)both white blood cells and immature cells
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1. c) sarcoma
2. d)initiation factors-amino acid activation
3. c) measles and chickenpox
4. d) virus
5. d) all of these
6. d)hematuria
7. c)Tuberculosis and Leprosy
8. c)leukemia
9. c)cancer of cervix
10. Ans: d)both white blood cells and immature cells
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Multiple choice on Prokaryotic Cell Structure

MCQ on Prokaryotic Cell Structure
1. Which of the following is the typical feature of a prokaryotic cell?
a) absence of DNA
b) absence of nucleus
c) absence of RNA
d) absence of cell wall
Multiple choice on Prokaryotic Cell Structure
2. The region in prokaryotic cell where double stranded single circular DNA is present is called as
a) nucleoplasm
b) nuclues
c) nucleoid
d) protonucleus

3. Ribosomes in prokaryotic cells are
a) 80 S
b) 70 S
c) 60S + 40 S
d) 50S + 40 S

4. Extra chromosomal self replicating ds circular DNA molecules present in bacteria are called
a) episomes
b) plasmid
c) plastid
d) extra chromosomes

5. The membranous infolding which is thought to be the site of DNA replication in bacteria is  called
a) plasmids
b) nucleoids
c) mesosomes
d) pili

6. The cell wall of eubacteria is made up of
a) cellulose
b) peptidoglycan
c) phospholipids
d) chitin

7. The extracellular appendage which helps in movement in bacteria 
a) pili
b) flagella
c) flagellin
d)capsule

8. Extremely fine  extracellular structures involved in cell to cell contact is
a) flagella
b) cilia
c) pili
d) spinae

9. In some bacteria, there is a slimy layer outside to cell wall considered as virulence factor is called
a) capsule
b) plasmid
c) outer layer
d) fimbriae

10. Which of the following are characteristics of prokaryotic cells?
a) Absence of nucleus
b) Absence of cell organelles
c) Presence of 70S ribosomes
d) All of the above
Check your understanding: Labelled Diagram Quiz on Bacterial cell

Answers
1. b) absence of nucleus
2. c) nucleoid
3. b) 70 S
4. b) plasmid
5. c) mesosomes
6. b) peptidoglycan
7. b) flagella
8. c) pili
9. a) capsule
10. d) All of the above

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Multiple Choice Questions on Mode of Action of Antibiotics

MCQ on Mode of Action of Antibiotics
1. Penicillin causes bacterial cell lyses by inhibiting the enzyme that catalyzes cross- linking of peptidoglycan chains of the bacterial cell wall. The enzyme is
a) enolpyruvyl transferase
b) transglycolase
c) transpeptidase
d) ribonuclease


2. Which of the following antibiotics blocks the first step of peptidoglycan cell wall synthesis by  inhibiting enzyme MurA?
a) Fosfomycin
b) Penicillin
c) Vancomycin
d) Bacitracin

3. Which of the following is a DNA gyrase inhibitor, thus disrupting bacterial DNA replication?
a) ciprofloxacin
b) Vancomycin
c) Chloramphenicol
d) Streptomycin

4. All the following drugs are bacterial cell wall synthesis inhibitors except
a)Vancomycin
b) Bacitracin
c) Fosfomycin
d) Rifamycin

5. All the following are protein synthesis inhibitors which binds to the 50S ribosomal subunit and blocks protein synthesis except
a) Streptomycin
b) Erythromycin
c) Cliindamycin
d) Chloramphenicol

6. Which of the following antibiotic inhibits transcription by binding DNA at the transcription initiation complex and preventing elongation of RNA chain by RNA polymerase?
a)Rifampicin
b) Streptomycin
c) Carbenicillin
d) Actinomycin D

7. This antibiotic binds to the D-ala residues preventing cross linking of cell wall strands by preventing the binding of cross linking enzyme. The antibiotic is  
a) Erythromycin
b) Vancomycin
c) Cephalosporin
d)Chloramphenicol

8. Which of the following is not a protein synthesis inhibitor by binding to 30 S small ribosomal subunit?
a) Kanamycin
b) Streptomycin
c) Erythromycin
d)Tetracycline

9. Which of the following antibiotic prevents bacterial transcription by directly binding to the bacterial RNA polymerase?
a) Rifampin
b) polymixin
c) Puromycin
d) Streptomycin

10. The antibiotic that prevents peptidoglycan synthesis by blocking the transport of peptidoglycan monomer is
a)Cephamycin
b) Cephalosporin
c) Bacitracin
d)Vancomycin
 Learn more:
Answers
1. c) transpeptidase
2. a) Fosfomycin
3. a) ciprofloxacin
4. d) Rifamycin
5. a) Streptomycin
6. d) Actinomycin D
7. b) Vancomycin
8. c) Erythromycin
9. a) Rifampin
10. c) Bacitracin
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Multiple Choice Questions on Cellular and Molecular Biology


1. What is the Best evidence that genes encode the amino acid sequence of proteins?
a) proteins are macromolecules
b) The amino acid sequence of polypeptide is changed by gene mutation
c) DNA serves as a template for RNA
d)mRNA is found in the ribosome

2. Which is not a characteristic of proteins?
a) waxes
b)albumins
c) carotenoids
d)Lecithin

3. The tRNA anticodon for the amino acid valine is CAA(reading 3’ to 5’). What is the mRNA codon for valine (reading 5’ to 3’)
a) TTG
b) GGU
c) CCA
d) UGG

4. The basis for the pairing of the two strand of DNA in the double helix is
Multiple Choice Questions on Cellular and Molecular Biology
a) covalent bonding
b) hydrogen bonding
c) hydrophobic interaction  
d) tertiary structure

5. Which of the following statements about the Krebs cycle is not true?
a) The Krebs cycle is linked to glycolysis by pyruvate
b) The Krebs cycle produces nucleotides such as NADH and FADH2
c) Citrate is an intermediate in the Krebs cycle
d) The Krebs cycle is the single greatest source of ATP in the cell

6. Which of the flowing is a correct association?
a)Polysome: group of Golgi complexes
b)Ribosome: electron transport chain
c)Lysosome: digestive enzyme for intracellular use
d)Mitochondria: transport materials from the nucleus to the cytoplasm

7. Which of the following statements about viruses is not true?
a)The protein coat of the virus does not enter a host bacterial cell
b)Their genetic material may be DNA or DNA
c)The virus may replicate in a bacterial host
d)The virus may replicate autonomously in the absence of a host

8.  Cells  that involved in active transport such as cells of the intestinal epithelium, utilize large quantities of ATP. In such cells, there are
a)many polyribosomes
b)many mitochondria
c)many lysosomes
d) high level of adenylate cyclise activity

9.  Which of the following statements regarding photosynthesis is not true?
a)The light cycle occurs only during exposure to light.
b)Red and blue are optimal for photosynthetic function
c)ATP is produced during the light cycle.
d)The dark cycle occurs only in the absence of light.

10. Which of the following process utilizes proofreading to increase its accuracy?
 a)transcription
b)DNA replication
c)recombination
d)electron transport
Answers
1. b) The amino acid sequence of polypeptide is changed by gene mutation
2. b)albumins
3. b) GGU
4. b) hydrogen bonding
5. d) The Krebs cycle is the single greatest source of ATP in the cell
6. c)Lysosome: digestive enzyme for intracellular use
7. d)The virus may replicate autonomously in the absence of a host
8. b)many mitochondria
9. d)The dark cycle occurs only in the absence of light.
10. b)DNA replication
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Multiple Choice Questions on Natural Resources


1. Which of the following is a non-renewable resource?
a) water
b) coal
c) soil
d) wildlife
2. Conventional energy refers to
a) Exhaustible energy sources in limited quantity
b) Inexhaustible energy sources in unlimited quantity
c) renewable energy resources
d)  none of these
3. Which of the following is an inorganic natural resource?
a) water
b) fossil fuels
c) plants
d) animals
4. Energy that is trapped in the form of organic matter is called
a) Conventional energy
b) Renewable energy
c) Biomass energy
d) Bioenergy
5. Which of the following is a renewable source of energy?
a) petroleum
b) nuclear fuel
c)  trees
d) coal
6. Which of the following is considered as conventional, inexhaustible source of energy?
a) thermal energy
b) hydropower
c) solar energy
d) wind energy
Multiple Choice Questions on Natural Resources

7. All are renewable resources except
a) soil fertility
b) rainfall
c) biological species
d) wildlife 
8. Fossil fuels include
a) coal and metals
b) coal, natural gas and oil
c) oil and minerals
d) oil, minerals and metals
9. Which of the following is not a conventional energy resource?
a) petrol
b) LPG
c) tidal energy
d) coal
10. Which of the following is an exhaustible renewable resource?
a) petroleum
b) tidal energy
c) coal
d) fresh water
Learn more:

Answers:
1. b) coal
2. a) Exhaustible energy sources in limited quantity
3. a) water
4. c) Biomass energy
5. c) trees
6. b) hydropower
7. c) biological species
8. b) coal, natural gas and oil
9. c) tidal energy
10. d) fresh water
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MCQ on Translocation of Water

1. Which of the following element is responsible for maintaining turgor?
a)Na
b)Ca
c)P
d)K
Show Answer


2. Why the tropical deciduous forest trees shed their leaves?
a)to prevent loss of water
b)to enhance the rate of absorption
c)to enhance rate of transpiration
d)to prevent loss of water

Show Answer
3. Which one of the following is produced during water stress and cause closure of stomata
a)Abscisic acid
b)cytokinin
c)Ethylene
d)Gibberellic acid

Show Answer
4. Which one of the following  plant would metabolism be hindered if the leaves are coated with wax on their upper surface?:
a) Hydrilla
b)Vallisnaria
c)Lotus
d)Pistia

Show Answer
5. Which one of the following is used for measuring the rate of transpiration
potometer
a)potometer
b)porometer
c)osmometer
d)None of these

Show Answer
6. Stomata open at night and close during day time in
a) xerophytes
b)mesophytes
c)hydrophytes
d)epiphytes

Show Answer
7. Phenyl Mercuric acetate (PMA) results in
a) killing of plants
b)reduced respiration
c)reduced transpiration
d)reduced transpiration

Show Answer
8. Active K+ exchange mechanism for opening and closing stomata was given by:
a) Darwin
b)Levitt
c)Scarth
d)Khorana

Show Answer
9. Which one explains ascent of sap
a)Cohesion theory
b)Mass flow
c)Malate hypothesis
d)Interfacial flow hypothesis

Show Answer
10.The principal pathways by which water is translocated in angiosperms is
 a)xylem vessel system
b) sieve cells of phloem
c) xylem and phloem together
d)sieve tube members of phloem
Show Answer
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