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? 

a. UAA,UAU,UUA 

b. UGA,UAG,UAA 

c. UGG,UGA,UAU 

d. UGG,UAA,UAG 


Answer- UGA,UAG,UAA


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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