MCQ Biology - Learning Biology through MCQs

Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Antigen and Antibody

1. The second most abundant Ig is
a) IgM
b) IgG
c) IgA
d) IgE

2. The most effective Ig is
a) IgM
b) IgG
c) IgA
d) IgE

3. IgM is a
a) pentamer with 10 antigen binding sites
b) tetramer with 8 antigen binding sites
c) monomer with 2 antigen binding sites
d) dimer with 4 antigen binding sites

4.The Ig that mediates allergic reaction is
a) IgM
b) IgG
c) IgA
d) IgE

5. The Ig involved in host defence against parasitic infection (helminths)
a) IgM
b) IgG
c) IgA
d) IgE

6. The bonds involved in antigen-antibody interactions are
a) weak hydrogen bonds and vanderwalls forces
b) strong covalent bonds
c) strong di- sulphide bonds
d) all of these

7. Which of the following statement is true
a) all immunogens are antigens but all antigens are not immunogens
b) all immunogens are antigens and all antigens are immunogens
c) all immunogens are not antigens but all antigens are immunogens
d) all immunogens are proteins and all proteins are immunogens

8. Any agents that may stimulate the immune system and enhance the response without having any specific antigenic effect by itself.
a) antigens
b) allergens
c) adjuvants
d) carriers

9. Small chemical groups on the antigen molecule that can react with antibody
a) epitope
b) paratope
c) isotope
d) allotope

10. Which of the statements are true regarding antigen
a) generally self-molecules and molecules with low molecular weight are non-immunogenic
b) an antigen generally has many epitopes
c) heteropolymers are more immunogenic than homopolymers
d) all of these

Answers
1. c) IgA
2. a) IgM
3. a) pentamer with 10 antigen binding sites
4. d) IgE
5. d) IgE
6. a) weak hydrogen bonds and vanderwalls forces
7. a) all immunogens are antigens but all antigens are not immunogens
8. c) adjuvants
9. a) epitope
10. d) all of these
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Multiple Choice Questions on Vegetative Propagation in Plants

1. Which of the following statement is true regarding vegetative propagation?
a)      Vegetative propagation occurs naturally and artificially producing genetically identical plants
b)      Vegetative propagation occurs naturally and artificially producing genetically different plants
c)       Vegetative propagation occurs artificially producing genetically similar plants
d)      Vegetative propagation occurs naturally producing genetically similar plants

      2. All the following plants can be propagated by leaf cuttings except
a)      Begonia
b)      Hibiscus
c)       Bryophyllum
d)      Sansiveria

      3. Which of the following method is commonly practiced for root induction?
a)      Cutting
b)      Layering
c)       Grafting
d)      Budding

4. Rooting in stem cuttings are stimulated by using
           a) jasmonic acid b) ABA c) ethylene d) IAA
5. ‘Conifer cuttings’ are practiced for propagating pine, spruce etc. They are usually taken during
a) early spring
b) early winter
c) late spring
d) late winter

6. The method of inducing rooting by girdling aerial branches is called air layering. Air layering is also called as
a) gootee
b) Chinese layering
c) pot layering
d) all of these

7. The method of layering in which rooting is induced at different nodes simultaneously in the soil is called compound layering. It is also called as
a) air layering
b) serpentine layering
c) trench layering
d) mound layering

8. Which of the following method is suitable for combining the desirable characters of two plants together in  a single plant
a) cutting
b) layering
c) grafting
d) all of these

9. Identify the diagram

a) layering
b) approach grafting
c) wedge grafting
d) tongue grafting

10. In grafting, the rooted plant is called the stock. The stem cutting from the donor plant is called
a) transplant
b) scion
c) bud graft
d) root stock

Answers:
1. a) Vegetative propagation occurs naturally and artificially producing genetically identical plants
2. b) Hibiscus
3. b) Layering
4. d) IAA
5. b) early winter
6. d) all of these
7. b) serpentine layering
8.  c) grafting
9.  c) wedge grafting
10. b) scion
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Multiple Choice Questions on Enzymology

1. The degree of inhibition for non competitive inhibition of an enzyme catalyzed reaction?
a) Increase with increase substrate concentration
b) Reaches with increase in substrate concentration
c) Reaches a maxima with increase in substrate concentration and then decreases
d) Decreases with increase in substrate concentration

2. Enzyme papain is used with success to
a) increase meat production
b) ripen papaya fruit
c) leaven bread
d) tenderize meat

3. Which one of the following reactions used for the purpose of recycling enzymes in bioprocesses
a) isomerization
b) phosphorylation
c) immbolization
d) polymerization

4. Which one of the following techniques is not ideal for immobilized cell free enzymes?
a) physical entrapment by encapsulation
b) physical bonding by flocculation
c) covalent chemical bonding by cross linking the precipitate
d) covalent surface bonding to surface carriers

5. Most industrial enzymes are obtained from
a) plants
b) microbes
c) insects
d) animal tissues

6. Ki indicates
a) reaction velocity
b) Competition inhibition
c) denaturation of enzyme
d) all the above

7. The phenomenon by which the synthesis of a set of enzyme leading to a product from outside is known as
a) repression
b) suppression
c) depression
d)none of these

8. De novo synthesis of an enzyme, promoted by the substrate on which it acts, is characterised by the term
a) induction
b) activation
c) gratuity
d)derepression

9. Out of total enzymes present in the cell mitochondria alone has

a) 4%
b) 70%
c) 95%
d) no enzymes

10. Enzymes, vitamins and hormones can be classified into a single category of biological chemicals because all of them
a) Aid in regulating metabolism
b) Are synthesised in organism
c) Are proteins
d) Enhance the oxidation metabolism
Learn more:
Answers
1. c) Reaches a maxima with increase in substrate concentration and then decreases
2. d) tenderize meat
3. c) immbolization
4. b) physical bonding by flocculation
5. b) microbes
6. b) Competition inhibition
7. a) repression
8. a) induction
9. b) 70%
10. c) are proteins
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MCQ on Animal Biotechnology

1. In animal cell cultures, the addition of serum to media is essential for providing?
a) growth factors
b) amino acid for protein synthesis
c) nucleotide for DNA synthesis
d) all of these

2. cdc mutant useful for the study of
a)various stages of cell cycle
b)homeodomain
c)Apoptosis only
d)chromosome break point

3. Recombinant DNA human health care product developed for treating haemophiliacs is
a) interferon
b) lymphokines
c) coaglutation factor IX
d) phytohemaglutinin

4. Which of the following has been produced commercially from mammalian culture?
a) insulin
b) renin
c) plasminogen activator
d)antibacterial antibody

5. A heterologous protein for its expression in the milk of a transgenic animal should be under the control of the promoter of the gene coding for 
a) preproinsulin
b) Lac Z
c)β globin
d) β lactoglobulin

6. Aminopterine is used during the production of hybridoma cells because it

a) Blocks the salvage pathway
b) Prevents the growth of B cells
c) Prevents the growth of myeloma cells
d) Blocks the synthesis of Ig by B cells

7. Antibody diversity is generated by
a) Allelic exclusion
b) Protein splicing
c) Somatic mutation
d) Interchromosomal recombination

8. Reverse vaccinology indicates
a) from antibody to vaccine development
b) from genome sequence to vaccine development
c) from antigenic polysaccharide to vaccine development
d) from antigenic protein to vaccine development

9. The culture fluid of 1000 to 5000 colonies of hybridoma are screened for monoclonal antibody by
P- Antigen capture analysis Q- Western blot analysis
R-Northern blot analysis S-antibody capture analysis
a) P, Q
b) R, S
c) Q, S
d) P, S

10. All of the following are produced by animal cells in culture and help the cells adhere to the culture dish except
a) collagen
b) glycoprotein
c) phospholipase A
d) hyaluronic acid
Learn more:

Answers
1.a) growth factors
2. a)various stages of cell cycle
3. c) coaglutation factor IX
4. c) plasminogen activator
5. d) β lactoglobulin
6. a) Blocks the salvage pathway
7. a) Allelic exclusion
8. d) from antigenic protein to vaccine development
9. d) P, S
10. c) phospholipase A
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Multiple Choice Questions on Genetic Engineering and Recombinant DNA technology

1. DNA sequencing is done by
DNA sequencing
a) Maxam Gilbert method
b) Sanger dideoxy method
c) Both a and b
d) Watson and Crick

2. A vector should have which of the following properties
i) MCS                   ii) Small size  iii) Multiple ori  iv)low replication speed
a) i, ii, iii               
b) ii, iii, iv
c) i, ii, iv
d) i, iii, iv

3. DNA staining is done by
a) Cystal violet
b) Giemsa staining
c) Methylene blue
d) Feulgen staining

4. Which of the following is not a restriction endonuclease?
a) Eco RI
b) DNA ligase
c) Hind III
d) Bam H1

5. Use of alkaline phosphatase is to
a) remove terminal phosphates from 3’end
b) remove terminal phosphates from 5’end
c) remove terminal phosphate from both end
d) All of these

6. The uptake of plasmid DNA into bacterial cell is facilitated in the presence of
a) calcium chloride
b) magnesium chloride
c) potassium chloride
d) all of these

7. Taq polymerase is used in PCR because of its
a) low thermal stability
b) high fidelity
c) high speed
d) high thermal stability

8. Introduction of recombinant DNA into bacterial cell by using current is called
a) transformation
b) electroporation
c) transformation
d) tranduction

9. Nick translation is done by
a) DNA polymerase I
b) DNA polymerase II
c) DNA ligase
d) Kinase

10. Telomeric sequences are found in
a) HAC
b) BAC
c) YAC
d) PAC
Answer
1. c) Both a and b
2. c) i, ii, iv
3. d) Feulgen staining
4. b) DNA ligase
5. d) all of these
6. a) calcium chloride
7. d) high thermal stability
8. b) electroporation
9. a) DNA polymerase I
10. c) YAC
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Multiple Choice Questions on Agricultural Biotechnology

1. Two bacteria most useful in genetic engineering are
a)Rhizobium and Azobacter
b)Nitrosomonas and Klebsilla
c)Escherichia and Agrobacterium
d)Rhizobium and Diplococcus
 
2. Transposon is known as
a)IS element
b)Jumping gene
c)conservative gene
d)co integrate gene
 
3. The uptake of plasmid DNA into the bacterial cell is facilitated by the presence of --- in the medium
a) Calcium Chloride
b) Potassium chloride
c) Magnesium chloride
d) none of these
 
4. The travel of gene expression and gene activation can be measured using which of the following?
a) Reporter gene
b) Marker gene
c)Gene sequences
d)Promoter element
 
5. The enzyme required to obtained wall free/ nacked protoplasts are
a) cellulase and proteinase
b) cellulase and pectinase
c) cellulase and amylase
d) amylase and pectinase
 
6. A synchronous culture is one in which the majority of cells proceed through
a) Lag phase
b) Log phase
c) exponential phase
d) each cell cycle phase (G1, S, G2 and M)
 
7. DNA molecules, identical except for different numbers of superhelical turns are called
a) Chain isomers
b) Topoisomers
c) Helical isomers
d) Geometrical isomers
 
8. Application of embryo culture is in
a) clonal propagation
b) Production of alkaloids
c) Production of soma clonal variation
d)overcoming hybridisation barrier

9. Haploid culture are got from

a) leaves
b) root tips
c) pollen grain
d) bud

10. Differentiation of shoot in plant tissue culture is controlled by
a)high auxin : cytokinin ratio
b) high cytokinin : auxin ratio
c) high gibberellin : cytokinin ratio
d) high gibberellin: auxin ratio
Learn more:
Answers
1.c) Escherichia and Agrobacterium
2.b) Jumping gene
3.a) Calcium Chloride
4.b) Marker gene
5.b) cellulase and pectinase
6.d) each cell cycle phase (G1, S, G2 and M)
7.b) Topoisomers
8.d) overcoming hybridisation barrier
9.c) pollen grain
10.b) high cytokinin : auxin ratio
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Multiple Choice Questions on Heredity

1. Which of the following best expresses the concept of the word ‘allele’?
a) Genes for wrinkled and yellow
b) Genes for wrinkled and round
c)phenotypes
d)the expression of agene

2. A human genetic defect that is caused by nondisjuction of the sex chromosome is
a) Sickle cell anemia
b) red green color blindness
c) Down syndrome
d) Turner syndrome

3. The inheritance of skin colour in humans is an example of which of the following?
a) Epistasis
b) Gene linkage
c) polygeneic inheritance
d) codominance

4. In tobacco, if the diploid number of chromosomes is 48, how many chromosomes will be found in a pollen grain?
a) 96
b) 48
c) 24
d) 12

5. Which of the following gives information about the phenotype but not the genotype?
a) XHY.
b) Hemophiliac man.
c) Tall pea plant.
d) Female carrier for colour-blindness.

6. An example of alleles is:
a) AB and Tt.
b) TT and Tt.
c) T and t.
d). X and Y.

7) Genetic traits of seeds are noted as follows:
L = long, l = short
W = wrinkled, w = smooth
Y = yellow, y = white
R = ribbed, r = grooved
Which of the following is the genotype for a short, wrinkled, yellow, grooved seed?
a) llWwyyrr
b) LLWWyYRr
c) LlWwYYRr
d) llWwYYrr

8) An example of a genotype is:
a) A tall pea plant.
b) R and r.
c) TtHH.
d) Hemophiliac.

9) A pedigree chart shows:
Dominant trait pedigree
a) The genotypic ratios of the offspring.
b) The types of gametes produced by the parents.
c) The pattern of inheritance of a specific gene.
d)Which genes are co-dominant.


10) Mendel discovered principles of inheritance because he:
a)Observed simultaneously all of the many characteristics in which the parents differed.
b) Believed that the hereditary characteristics of two individuals became thoroughly blended in
the offspring.
c) Ignored all characteristics except a few markedly contrasting ones in which he studied.
d) Studied only the offspring obtained from a single mating.

Learn more:
Answers
1. b) Genes for wrinkled and round
2. d) Turner syndrome
3. c) polygeneic inheritance
4. c) 24
5. c) Tall pea plant.
6. c) T and t.
7. d) llWwYYrr
8. c) TtHH.
9. c) The pattern of inheritance of a specific gene.
10. c) Ignored all characteristics except a few markedly contrasting ones in which he studied.
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Multiple Choice Questions on Molecular Genetics

1. The end product of translation are
a) amino acids
b) lipids
c) polypeptides
d) all of these

2. All viruses consists of
a) DNA and protein coat
b) RNA and protein coat
c) Polysaccharides and proteins
d)a nucleic acid and a protein coat

3. In bacteria, a small circle of DNA found outside the main chromosome is called a
a) plasmid
b)protein
c)genetic fingerprint
d)episome

4. The genetic instructions for forming a polypeptide chain are carried to the ribosome by the
a)tRNA
b)rRNA
c)mRNA
d)DNA

5. The DNA of an elephant and the DNA of a mango tree will probably differ in all of the following
a) Sequence of DNA nucleotides
b) Length of DNA molecules
c) Number of DNA molecules
d) Kinds of nucleotides utilized in forming DNA

6. The lac operon in E.coli is involved in
a) Regulating the expression of a gene
b) Controlling DNA replication
c) Regulating the translation of mRNA
d) Controlling the formation of ribosomes

7. Genetic variation can be introduced into bacteria by all of the following methods except:
a)transduction
b)mutation
c)transformation
d)DNA amplification

8. Which of the following would most likely cause a mutation with the greatest deleterious effect?
a) An insertion of a nucleotide triplet into a DNA strand that codes for an mRNA
b)  A single addition of a nucleotide in a DNA strand that codes for an mRNA
c) a deletion of a nucleotide triplet from a DNA strand that codes for an mRNA
d) all of these

9. All of the following enzymes are involved in DNA replication except:
a) helicase
b) primase
c) DNA polymerase
d) RNA polymerase

10. Which of the following is true?
a) A messenger RNA molecule has the form of a double helix
b) Ribosomes contain RNA nucleotides and amino acids
c) The uracil nucleotide consists of the uracil nitrogen base, a deoxyribose sugar and a phosphate group.
d) In eukaryotes, DNA is manufactured in the nucleus and RNA is manufactured in the cytoplasm.


Answers
1c) polypeptides
2d)a nucleic acid and a protein coat
3a)plasmid
4c)mRNA
5d)Kinds of nucleotides utilized in forming DNA
6a)Regulating the expression of a gene
7d)DNA amplification
8b)A single addition of a nucleotide in a DNA strand that codes for an mRNA
9d)RNA polymerase
10b)Ribosomes contain RNA nucleotides and amino acids
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Practice Test on Algae - Diversity in Living World

Algae are pigmented thallophytes. They prepare their own food materials with the help of chlorophyll and sunlight. So they are said to be autrotrophs. Besides chlorophyll there are other colored pigments in algae. Structure and reproduction of algae was written by Fritsch. He is known as father of phycology. Fritsch classified algae into 11 classes on the basis of type of pigments, nature of reserve food material and mode of reproduction. Read more>>
Biology Practice Test: Algae
When you've finished answering as many of the questions as you can, scroll down to the bottom of the page and check your answers by clicking 'get score'.
Dictyota dichotoma (Phaeophyceae)
1. What among the following do you consider the best evidence to show that two species of algae are closely related?
they both have same type of pigments
they both have reproduce sexually
they both respire and release carbondioxide
they both have same type of pigments
2. In eukaryotic algae and fungi, flagella and cilia of zoospores and gametes are
have 1+0 arrangement of fibrils
The peripherals fibrils are triplets and central are doublets
have 9+0 arrangement of fibrils
generally similar and have 9+2 arrangement of fibrils. The peripheral fibrils are doublelets and central fibrils are just canal like
3. Filaments of Ulothrix produce
Isogametes
Anisogametes
Heterogametes
None of these
4. Vaucheia, a siphonaceous alga, belongs to
Chlorophyceae
Xantophyceae
Cyanophyceae
Charophyceae
5. Trumpet hyphae in certain brown algae resemble
Tracheids
Trachea
Sieve tubes
Sclerenchymatous fibres
6. Non motile gamaetes are characteristically found in
Rhodophyta
Cyanophyta
Phaeophyta
Chlorophyta
7. Fairly good yield of rice can be had over a number of years without adding any nitrogenous manure because
they require very minute quantities of nitrogen.
Rice plants do not require any nitrogen
There are nitrogen fixing blue green algae in the rice fields
Their roots have nitrogen fixing bacteria associated with them
8. The algal component in lichen generally belongs to the class
Xanthophyceae
Phaeophyceae
Cyanophyceae
Rhodophyceae
9. Among the following which is obtained from algae
Agar agar
Wax
Chocolate
butter
10. Water bloom is generally caused by
Hydrilla
Bacteria
Blue green algae
Green algae
Score =
Correct answers:
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MCQ on Modern Techniques In Disease Diagnosis

1. The device used to study the activity of brain is
a)EEG
b)ECG
c)Autocatalyser
d)Dialyser

2. The techniques uses the body’s water molecules are the bases for its images
MRI scan
a)sonography
b) MRI
c)radioactive traces.
d)digital substraction angiography

3. Cross sectional image of internal body structure can be obtained by using this medical technique
a)ECG
b)CAT
c)NMR
d)ECG

4. Blood dialysis is also called
a) Artificial lung
b) Artificial kidney
c) Artificial heart
d) Artificial brain

5. During amniocentesis chromosomal abnormalities of the fetus can be detected by taking the sample of
a) Foetal blood
b) Mother’s blood
c) Body fluid from the mother
d) Fluid surrounding the foetus

6. ELISA is commonly used to detect
ELISA plate
a)Mumps
b)Rabies
c)AIDS
d)Tetanus

7. Who is considered as the father of electrocardiography?
a)Jenner
b)Purcell
c)Housfield
d)Einthovan

8. Which one of the following is an imaging technique?
a)MRI scan
b) ELISA
c)Widal test
d)ECG

9. The technique used to detect foetal movement is
a)PET
b)CT scan
c)PET
d) Ultrasound scan

10. First human EEG was recorded by
a)Purcell
b) Jeffrey
c) Hans Berger
d) Einthovan

11. ELISA is used to detect viruses where the key reagent is
a) catalase
b) DNA probe
c) RNAase
d)Alkaline phosphatase

12. Cornea transplantation is successful because
a)cornea is easy to preserve
b) cornea is easy available
c) cornea is not linked up with blood vascular and immune system.
d)the technique involved is very simple
Learn more
Answers
1. a)EEG
2. b) MRI
3. b)CAT
4. b) Artificial kidney
5. d) fluid surrounding the foetus
6. c)AIDS
7. d)Einthovan
8. a)MRI scan
9. d) Ultrasound scan
10. c) Hans Berger
11. d)Alkaline phosphatase
12. c) cornea is not linked up with blood vascular and immune system.
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