Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- Human cell contains ______ different kinds of tRNA molecules 

a. 25.0 

b. 35.0 

c. 45.0 

d. 15.0 

Answer- 45.0

Que- In eukaryotes newly synthesized mRNA 

a. Travels a large distance from nucleus to cytoplasm 

b. Is directly released into the cytoplasm 

c. Contains a cap and tail 

d. Both a and c 

Answer- Both a and c

Que- Which 3 codons are nonsense codons? 






Que- Methionine is specified by 

a. Stop codon 

b. AUG 

c. Start codon 

d. Both b and c 

Answer- Both b and c

Que- In mitochondria UGA is/specifies as 

a. Stop codon 

b. Tryptophan 

c. Initiation codon 

d. Methionine 

Answer- Tryptophan

Que- Three nucleotide sequence on tRNA that specifies an amino acis is 

a. Codon 

b. Anticodon 

c. Nonsense codon 

d. Genetic code 

Answer- Anticodon

Que- Initiation complex in translation is composed of 

a. Ribosome and aminoacyl-tRNA 

b. Ribosome and tRNA 

c. tRNA and aminoacyl-tRNA 

d. None of these 

Answer- Ribosome and aminoacyl-tRNA

Que- Examples of chromosomal aberrations are 

a. Sickle cell anemia 

b. Phenylketonuria 

c. Down's syndrome 

d. Both a and b 

Answer- Both a and b

Que- Point mutations are represented as 

a. Presence of an extra chromosome 

b. Loss of chromosome 

c. Alteration in sequence of DNA nucleotide 

d. Insertions and inversion of genes 

Answer- Alteration in sequence of DNA nucleotide

Que- Strand of DNA which is not transcribed is called 

a. Antisense 

b. Template 

c. Coding 

d. None of these 

Answer- Coding

Que- Phenylketonuria is due to deficiency of 

a. Phenylalnine 

b. Phenylalanine hydroxylase 

c. Phenylene 

d. All of these 

Answer- Phenylalanine hydroxylase

Que- Molecular basis of sickle cell anaemia was found by 

a. F. Sanger 

b. Beadle and Tatum 

c. Vernone Ingram 

d. Mendal 

Answer- Vernone Ingram

Que- Which is incorrect about nucleosome 

a. 2 turns of DNA coiled round histones 

b. 8 histones as acidic proteins 

c. 200 nucleotides in one nucleosome 

d. None of these 

Answer- 8 histones as acidic proteins

Que- Sex chromosomes were 1" discovered in 

a. Man 

b. Pea plant 

c. Fruitfly 

d. None of these 

Answer- Fruitfly

Que- A sugarcane cell has _________ chromosomes. 

a. 20.0 

b. 32.0 

c. 40.0 

d. 80.0 

Answer- 80.0

Que- Centromere represents 

a. Primary constriction 

b. Secondary constriction 

c. Tertiary constriction 

d. Quaternary constriction 

Answer- Primary constriction

Que- Wich of the following cal kill mice if injected separately? 

a. Live R type pneumococcus 

b. Heat killed R type pneumococcus 

c. Live S type pneumococcus 

d. Heat killed S type pneumococcus 

Answer- Live S type pneumococcus

Que- X-Ray diffraction pattern of DNA was prepared by 

a. Rosalind Franklin 

b. Maurice Wilkins 

c. Watson 

d. Crick 

Answer- Rosalind Franklin

Que- In sickle cell Hb, which chain is affected? 

a. Alpha chain 

b. Beta Chain 

c. Both of these 

d. None of these 

Answer- Beta Chain

Que- In which of the following cases, genotypic and phenotypic ratio will remain same in F2 generation 

a. Law of independent assortment 

b. Law of Segregation 

c. Test cross 

d. Incomplete dominance. 

Answer- Incomplete dominance.

Que- How many pairs of homologous chromosomes are present in Pisum sativum 

a. Five pairs 

b. Six pairs 

c. Seven pairs 

d. Eight pairs. 

Answer- Seven pairs

Que- Which of the following characters of pea plant is dominant? 

a. Axial flowers 

b. Yellow pods 

c. White flowers 

d. Wrinkled seeds 

Answer- Axial flowers

Que- A pea plant with yellow seed was crossed to a plant having green seeds. What will happen in F1; if plants are true breeding 

a. All seeds will be yellow 

b. Half of seeds will be yellow 

c. All the seeds will be green 

d. Both will be present in ratio of 1:2:1 

Answer- All seeds will be yellow

Que- The position of a gene on chromosome is called 

a. Habitat 

b. Position 

c. Locus 

d. Location 

Answer- Locus

Que- Filial is a Latin word. It means 

a. Spring 

b. Issue 

c. Progeny 

d. Descendent 

Answer- Progeny

Que- Which of the following condition is hybrid 

a. TT 

b. Tt 

c. tt 

d. All of these 

Answer- Tt

Que- Which of the following is monohybrid cross 

a. TT x tt 

b. TTYy x Ttyy 

c. Both of these 

d. None of these 

Answer- TT x tt

Que- A pure breeding tall plant was crossed to dwarf plant. What would be probability of "Tt" genotype in F2 

a. 0.25 

b. 0.5 

c. 0.75 

d. 0.0 

Answer- 0.5

Que- If a heterozygous individual shows the complete effect of both alleles, the type of inheritance would be 

a. Complete dominance 

b. Non dominance 

c. Incomplete dominance 

d. Co-Dominance 

Answer- Co-Dominance

Que- The gene which controls ABO group has how many alleles in an individual 

a. One 

b. Two 

c. Three 

d. Four. 

Answer- Three

Que- How many genes control Rh blood group system? 

a. One 

b. Two 

c. Three 

d. Four 

Answer- Three

Que- A man with blood group "A" marries a woman of blood group "B". Both are heterozygous. What is the off-springs having phenotype "O" 

a. Zero 

b. 0.25 

c. 0.5 

d. 0.75 

Answer- 0.25

Que- The trait "Kernel colour in corn" in controlled by how many pairs of genes 

a. One pair 

b. Two pairs 

c. Three pairs 

d. Many pairs. 

Answer- Three pairs

Que- Baldness is most frequent in 

a. Men 

b. Women 

c. Children 

d. Girls. 

Answer- Men

Que- In nature, Garden pea is 

a. Self-fertilized 

b. Cross fertilized 

c. Cross pollinated 

d. None of these 

Answer- Self-fertilized

Que- The genes which do not follow law of independent assortment 

a. Crossed genes 

b. Linked genes 

c. Recessive genes 

d. Dominant genes 

Answer- Linked genes

Que- Phenotype represents 

a. Morphology 

b. Physiology 

c. Genetics 

d. None of these 

Answer- Morphology

Que- During test cross, if all offsprings are phenotypically dominant then parents are 

a. Homozygous 

b. Heterozygous 

c. One homozygous other heterozygous 

d. None of these 

Answer- Homozygous

Que- True breeding variety is produced by 

a. Self fertilization 

b. Cross fertilization 

c. Both of these 

d. None of these 

Answer- Self fertilization

Que- Genotype ratio of Mendel's law of independent assortment is 

a. 3:(a) 

b. 0.04306712962962963 

c. 9:3:3:(a) 

d. None of these 

Answer- None of these

Que- Which of the following is universal donor? 

a. A 

b. B 

c. AB 

d. O 

Answer- O

Que- Such inheritance in which traits vary quantitatively is 

a. Continuously varying trait 

b. Incomplete dominance 

c. Test cross 

d. Polygenic inheritance 

Answer- Polygenic inheritance

Que- Inheritance in man is traced by 

a. Mathematical method 

b. Genetic method 

c. Statistical method 

d. Pedigree method 

Answer- Pedigree method

Que- Skin colour in man is controlled by 

a. 1 pair 

b. 2 pairs 

c. 4 pairs 

d. 8 pairs 

Answer- 4 pairs

Que- Feature correct to O-negative blood group 

a. A,B antigen present 

b. Anti-A, Anti-B antibody present 

c. Rh antigen present 

d. Rh antibody present 

Answer- Anti-A, Anti-B antibody present

Que- Which of the following blood group is always heterozygous? 

a. A 

b. B 

c. AB 

d. O 

Answer- AB

Que- Interaction between genes occupying different loci is 

a. Dominance 

b. Epistasis 

c. Pleiotropy 

d. None of these 

Answer- Epistasis

Que- Genes that affect growth rate in humans influencing both weight and height are 

a. Codominant 

b. Epistasis 

c. Pleiotropy 

d. Polygene 

Answer- Pleiotropy

Que- All of the following are continuously varying traits except 

a. Kernel colour in wheat 

b. Skin colour in humans 

c. Height in humans 

d. Tongue rolling in humans 

Answer- Tongue rolling in humans

Que- The number of linkage groups in humans is 

a. 12.0 

b. 23.0 

c. 46.0 

d. 92.0 

Answer- 23.0

Que- Recombination frequency between two linked genes can be calculated by 

a. Back cross 

b. Test cross 

c. Normal cross 

d. None of these 

Answer- Back cross

Que- Which of the following is male determining gene in humans? 

a. tfm 

b. SRY 

c. Both of these 

d. None of these 

Answer- SRY

Que- It was discovered by J.Seiler in 1914 in moth. 

a. XO-XX 

b. XY-XX 

c. ZZ-ZW 

d. None of these 

Answer- ZZ-ZW

Que- Haemophilia B is due to abnormality of factor 

a. VIII 

b. IX 

c. X 

d. XI 

Answer- IX

Que- Gene for blue opsin is present on chromosome. 

a. X 

b. Y 

c. 7.0 

d. 11.0 

Answer- 7.0

Que- Most common type of Diabetes mellitus is 

a. Type I 

b. Type II 

c. MODY 

d. None of these 

Answer- Type II

Que- Recombinant DNA contains DNA from 

a. 2 different sources 

b. 3 different sources 

c. 2 same sources 

d. 3 same sources 

Answer- 2 different sources

Que- First restriction enzyme was isolated by 

a. Kary Mullis 

b. Hamilton O. Smith 

c. Maxam Gilbert 

d. Hamilton John 

Answer- Hamilton O. Smith

Que- Commonly used restriction enzyme is 

a. pSC 101 

b. pBR 322 

c. EcoRI 

d. All of these 

Answer- EcoRI

Que- Natural extrachromosomal circular DNA molecules earrying genes for antibiotic resistance and fertility 

a. Recombinant DNA 

b. Chimaeric DNA 

c. Lambda phage 

d. Plasmids 

Answer- Plasmids

Que- Which one has antibiotic resistance gene for tetracycline and ampicillin? 

a. pSC 101 

b. pBR 322 

c. pCR 322 

d. None of these 

Answer- pBR 322

Que- The enzyme which seals the foreign DNA into the vector is 

a. Restriction endonuclease 

b. DNA polymerase 

c. DNA ligase 

d. DNA mutase 

Answer- DNA ligase

Que- Chimaeric DNA is also known as 

a. Recombinant DNA 

b. Complementary DNA 

c. Vector 

d. Plasmid 

Answer- Recombinant DNA

Que- Lambda phage is 

a. Virus 

b. Bacterium 

c. Plasmid 

d. Host cell 

Answer- Virus

Que- A genomic library is a collection of 

a. Bacterial clones 

b. Bacteriophage clones 

c. Viral clones 

d. Both a and b 

Answer- Both a and b

Que- A single stranded nucleotide sequence that will hybridize into a certain piece of DNA is 

a. Primer 

b. Probe 

c. Genome 

d. Both a & b 

Answer- Both a & b

Que- Which statement is not true about PCR? 

a. Developed by Kary Mullis 

b. Take its name from DNA polymerase 

c. Is not very specific 

d. Taq polymerase is used 

Answer- Is not very specific

Que- Taq polymerase is extracted from a bacterium 

a. Floral aquaticus 

b. Taq aquaticus 

c. Thermus floral 

d. Thermus aquaticus 

Answer- Thermus aquaticus

Que- DNA analysis is done to 

a. Diagnose viral infections 

b. Identify criminals 

c. Determine evolution 

d. All of these 

Answer- All of these

Que- A method of DNA sequencing in which DNA threads are chemically cut into pieces of different sizes is 

a. Sanger's method 

b. Maxam-Gilbert method 

c. Hamilton's method 

d. Vortex method 

Answer- Maxam-Gilbert method

Que- Human genome is ______ times larger than any other genome sequenced so far 

a. 45.0 

b. 35.0 

c. 25.0 

d. 15.0 

Answer- 25.0

Que- Organisms that have had a foreign gene inserted into them are 

a. Transformed organisms 

b. Transgenic organisms 

c. Transfigured organisms 

d. Recombinant organisms 

Answer- Transgenic organisms

Que- Some transgenic bacteria produce a dipeptide sweetener called 

a. Ultrasweet 

b. Disweet 

c. Monosweet 

d. Neutrasweet 

Answer- Neutrasweet

Que- Transgenic plants are produced when foreign genes are introduced into 

a. Mature plant embryo 

b. Immature plant embryo 

c. Roots 

d. Leaves 

Answer- Immature plant embryo

Que- Protoplasts are plant cells from which 

a. Cell walls are removed 

b. Nucleus is removed 

c. New organelles are added 

d. Vacuoles are taken out 

Answer- Cell walls are removed

Que- A weed engineered to produce a biodegradable plastic in cell granules is 

a. Mouse-cat cress 

b. Mouse weed 

c. Mouse-eared cress 

d. None of these 

Answer- Mouse-eared cress

Que- An antibody made by soybeans can be used to treat 

a. Herpes zoster 

b. Sickle cell anemia 

c. Measles 

d. Genital berpes 

Answer- Genital berpes

Que- In vortex method of transgenic animals gene is inserted 

a. By hand 

b. Into egg 

c. Both by hands and into eggs 

d. Is not applicable 

Answer- Into egg

Que- For biotechnology products which is the preferable vehicle 

a. Urine 

b. Milk 

c. Sweet 

d. Hairs 

Answer- Urine

Que- Cumulus cells are those that 

a. Remain with follicular cells after ovulation occurs 

b. Form corpus luteum 

c. Form lining of the ovary 

d. Cling to the egg after ovulation occurs 

Answer- Cling to the egg after ovulation occurs

Que- Two methods for gene therapy are 

a. In-vivo and ex-vitro 

b. Ex-vivo and in-vivo 

c. Both of these 

d. None of these 

Answer- Ex-vivo and in-vivo

Que- In cystic fibrosis patient lacks a gene for the transmembrane carrier of the 

a. Magnesium ion 

b. Calcium ion 

c. Cholesterol 

d. Chloride ion 

Answer- Chloride ion

Que- Plasmid do not carry gene for 

a. Antibiotic resistance 

b. Fertility 

c. Growth 

d. Both b and c 

Answer- Growth

Que- Full set of genes of an individual is called 

a. Genotype 

b. Genomic library 

c. Genome pool 

d. Genome 

Answer- Genome

Que- Substance used to terminate DNA at different points in Sanger's method is 

a. Deoxyribonucleotide triphosphate 

b. Dideoxyribonucleotide triphosphate 

c. Deoxyribonucleotide triphosphate 

d. Dideoxyribonucleoside triphosphate 

Answer- Dideoxyribonucleoside triphosphate

Que- Transgenic bacteria are produced in large vats called 

a. Transducer 

b. Biomultiplier 

c. Bioreactor 

d. Culture media 

Answer- Bioreactor

Que- Which of the following is correct about SCID? 

a. Common in children as well as in adults 

b. It is an immune disorder 

c. Is due to deficiency of adenosine diaminase 

d. Both b and c 

Answer- It is an immune disorder

Que- Tissue culture does not involve 

a. Growth of tissue in artificial medium 

b. Asexual reproduction 

c. Use of meristem 

d. Use of generative nucleus in pollen culture 

Answer- Use of generative nucleus in pollen culture

Que- Plants are totipotent because 

a. Each cell has full genetic potential of the organism 

b. A single cell could become a complete plant 

c. Both a and b 

d. Because they have lesser potential for tissue culturing 

Answer- A single cell could become a complete plant

Que- Coconut milk contains the plant hormone 

a. Auxins 

b. Cytokinins 

c. Gibberallins 

d. All of these 

Answer- Cytokinins

Que- Cell suspension cultures of 

a. Cinchona produces quinine 

b. Digitalis lanata produce digitoxin 

c. Both a and b 

d. None of these 

Answer- Both a and b

Que- A device that bombards a callus with DNA coated microscopic metal particles is 

a. DNA gun 

b. DNA shooter 

c. Particle gun 

d. All of these 

Answer- Particle gun

Que- Salt tolerant plants are 

a. Cadabidopsis 

b. Nemodopsis 

c. Saltdopsis 

d. Arabidopsis 

Answer- Arabidopsis

Que- Which of these is a true statement? 

a. Both plasmids and viruses can serve as vectors. 

b. Plasmids can carry recombinant DNA but viruses cannot 

c. Vectors carry only the foreign gene into the host cell. 

d. Only gene therapy uses vector. 

Answer- Both plasmids and viruses can serve as vectors.

Que- Which of these would you not expect to be a biotechnology product? 

a. Vaccine 

b. DNA probes 

c. Proteins 

d. Steroid hormones 

Answer- Steroid hormones

Que- Which of these is incorrectly matched? 

a. Protoplast-plant cell engineering 

b. RFLPs-DNA fingerprinting 

c. DNA polymerase-PCR 

d. DNA ligase-Mapping human chromosome 

Answer- DNA ligase-Mapping human chromosome

Que- The process that has transformed life on earth from its earliest forms to vast diversity is 

a. Mutation 

b. Evolution 

c. Migration 

d. Genetic drift 

Answer- Evolution

Que- Carolus Linnaeus was believer of 

a. Special creation 

b. Natural selection 

c. Catastrophism 

d. Inheritance of acquired characters 

Answer- Special creation

Que- Which scientist does not match his achievements 

a. Lamarck published his theory of evolution 

b. Lyell published principles of geology 

c. Malthus published essay on principle of population 

d. Cuvier published papers on inheritance 

Answer- Cuvier published papers on inheritance

Que- Archaebacteria can survive at 

a. 150?C 

b. 300?C 

c. 120?C 

d. 200?C 

Answer- 120?C

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