laboursonline – MCQs, Mock Tests | Biology Biology MCQ Question

A sugarcane cell has _________ chromosomes.

1. 20
2. 32
3. 40
4. 80

✅ Correct Answer: 4

Centromere represents

1. Primary constriction
2. Secondary constriction
3. Tertiary constriction
4. Quaternary constriction

✅ Correct Answer: 1

Wich of the following cal kill mice if injected separately?

1. Live R type pneumococcus
2. Heat killed R type pneumococcus
3. Live S type pneumococcus
4. Heat killed S type pneumococcus

✅ Correct Answer: 3

X-Ray diffraction pattern of DNA was prepared by

1. Rosalind Franklin
2. Maurice Wilkins
3. Watson
4. Crick

✅ Correct Answer: 1

In sickle cell Hb, which chain is affected?

1. Alpha chain
2. Beta Chain
3. Both of these
4. None of these

✅ Correct Answer: 2

Recombinant DNA contains DNA from

1. 2 different sources
2. 3 different sources
3. 2 same sources
4. 3 same sources

✅ Correct Answer: 1

First restriction enzyme was isolated by

1. Kary Mullis
2. Hamilton O. Smith
3. Maxam Gilbert
4. Hamilton John

✅ Correct Answer: 2

Commonly used restriction enzyme is

1. pSC 101
2. pBR 322
3. EcoRI
4. All of these

✅ Correct Answer: 3

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

1. Recombinant DNA
2. Chimaeric DNA
3. Lambda phage
4. Plasmids

✅ Correct Answer: 4

Which one has antibiotic resistance gene for tetracycline and ampicillin?

1. pSC 101
2. pBR 322
3. pCR 322
4. None of these

✅ Correct Answer: 2

The enzyme which seals the foreign DNA into the vector is

1. Restriction endonuclease
2. DNA polymerase
3. DNA ligase
4. DNA mutase

✅ Correct Answer: 3

Chimaeric DNA is also known as

1. Recombinant DNA
2. Complementary DNA
3. Vector
4. Plasmid

✅ Correct Answer: 1

Lambda phage is

1. Virus
2. Bacterium
3. Plasmid
4. Host cell

✅ Correct Answer: 1

A genomic library is a collection of

1. Bacterial clones
2. Bacteriophage clones
3. Viral clones
4. Both a and b

✅ Correct Answer: 4

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

1. Primer
2. Probe
3. Genome
4. Both a & b

✅ Correct Answer: 4

Which statement is not true about PCR?

1. Developed by Kary Mullis
2. Take its name from DNA polymerase
3. Is not very specific
4. Taq polymerase is used

✅ Correct Answer: 3

Taq polymerase is extracted from a bacterium

1. Floral aquaticus
2. Taq aquaticus
3. Thermus floral
4. Thermus aquaticus

✅ Correct Answer: 4

DNA analysis is done to

1. Diagnose viral infections
2. Identify criminals
3. Determine evolution
4. All of these

✅ Correct Answer: 4

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

1. 45
2. 35
3. 25
4. 15

✅ Correct Answer: 3

Organisms that have had a foreign gene inserted into them are

1. Transformed organisms
2. Transgenic organisms
3. Transfigured organisms
4. Recombinant organisms

✅ Correct Answer: 2

Some transgenic bacteria produce a dipeptide sweetener called

1. Ultrasweet
2. Disweet
3. Monosweet
4. Neutrasweet

✅ Correct Answer: 4

Transgenic plants are produced when foreign genes are introduced into

1. Mature plant embryo
2. Immature plant embryo
3. Roots
4. Leaves

✅ Correct Answer: 2

Protoplasts are plant cells from which

1. Cell walls are removed
2. Nucleus is removed
3. New organelles are added
4. Vacuoles are taken out

✅ Correct Answer: 1

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

1. Mouse-cat cress
2. Mouse weed
3. Mouse-eared cress
4. None of these

✅ Correct Answer: 3

An antibody made by soybeans can be used to treat

1. Herpes zoster
2. Sickle cell anemia
3. Measles
4. Genital berpes

✅ Correct Answer: 4

In vortex method of transgenic animals gene is inserted

1. By hand
2. Into egg
3. Both by hands and into eggs
4. Is not applicable

✅ Correct Answer: 2

For biotechnology products which is the preferable vehicle

1. Urine
2. Milk
3. Sweet
4. Hairs

✅ Correct Answer: 1

Cumulus cells are those that

1. Remain with follicular cells after ovulation occurs
2. Form corpus luteum
3. Form lining of the ovary
4. Cling to the egg after ovulation occurs

✅ Correct Answer: 4

Two methods for gene therapy are

1. In-vivo and ex-vitro
2. Ex-vivo and in-vivo
3. Both of these
4. None of these

✅ Correct Answer: 2

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

1. Magnesium ion
2. Calcium ion
3. Cholesterol
4. Chloride ion

✅ Correct Answer: 4

Plasmid do not carry gene for

1. Antibiotic resistance
2. Fertility
3. Growth
4. Both b and c

✅ Correct Answer: 3

Full set of genes of an individual is called

1. Genotype
2. Genomic library
3. Genome pool
4. Genome

✅ Correct Answer: 4

Transgenic bacteria are produced in large vats called

1. Transducer
2. Biomultiplier
3. Bioreactor
4. Culture media

✅ Correct Answer: 3

Which of the following is correct about SCID?

1. Common in children as well as in adults
2. It is an immune disorder
3. Is due to deficiency of adenosine diaminase
4. Both b and c

✅ Correct Answer: 2

Tissue culture does not involve

1. Growth of tissue in artificial medium
2. Asexual reproduction
3. Use of meristem
4. Use of generative nucleus in pollen culture

✅ Correct Answer: 4

Plants are totipotent because

1. Each cell has full genetic potential of the organism
2. A single cell could become a complete plant
3. Both a and b
4. Because they have lesser potential for tissue culturing

✅ Correct Answer: 2

Coconut milk contains the plant hormone

1. Auxins
2. Cytokinins
3. Gibberallins
4. All of these

✅ Correct Answer: 2

Cell suspension cultures of

1. Cinchona produces quinine
2. Digitalis lanata produce digitoxin
3. Both a and b
4. None of these

✅ Correct Answer: 3

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

1. DNA gun
2. DNA shooter
3. Particle gun
4. All of these

✅ Correct Answer: 3

Salt tolerant plants are

1. Cadabidopsis
2. Nemodopsis
3. Saltdopsis
4. Arabidopsis

✅ Correct Answer: 4

Which of these is a true statement?

1. Both plasmids and viruses can serve as vectors.
2. Plasmids can carry recombinant DNA but viruses cannot
3. Vectors carry only the foreign gene into the host cell.
4. Only gene therapy uses vector.

✅ Correct Answer: 1

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

1. Vaccine
2. DNA probes
3. Proteins
4. Steroid hormones

✅ Correct Answer: 4

Which of these is incorrectly matched?

1. Protoplast-plant cell engineering
2. RFLPs-DNA fingerprinting
3. DNA polymerase-PCR
4. DNA ligase-Mapping human chromosome

✅ Correct Answer: 4

Study of relationship of organisms to their environment is

1. Ecology
2. Palaentology
3. Geology
4. None of these

✅ Correct Answer: 1

All populations within an ecosystem interconnected to one another are known as

1. Species
2. Family
3. Community
4. Biomes

✅ Correct Answer: 3

Major regional ecological community of plants and animals forms

1. Biosphere
2. Biomass
3. Biomes
4. Bioecosystem

✅ Correct Answer: 3

The actual location or place where an organism lives is

1. Environment
2. Biosphere
3. Biomass
4. Habitat

✅ Correct Answer: 4

The role a species plays in a community including behavior and influence is

1. Nichon
2. Niche
3. Autecology
4. Profession

✅ Correct Answer: 4

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