Plant Biotechnology Online Multiple Choice Test 10

1. What are the essential characteristics of a cloning vector?

• Bacterial cells cannot survive without it
• Bacterial cells replicate it
• Bacterial cells take it up
• Both b and c

2. Which bacteria are known as natural genetic engineer of plants?

• Agrobacterium tumefaciens
• E.coli
• Bacillus sp
• Streptomyces sp

Plant Biotechnology MCQs Part 9

Neeraj Girdhar

1. What is the shape of root nodules?

• Spherical
• Circular
• Oval
• Rectangle

2. Root nodule is formed by the _________ of the root cells.

• elongation
• circularization
• curling
• proliferation

3. Proliferation of root nodule is induced by the bacterium _______.

• Anabena
• Azomonas
• Rhizobium
• Azospirillum

4. Fe-protein part of nitrogenase enzyme can also be called as _______.

• dinitrogen reductase
• dinitrogenase
• reductase
• dinitrogen

5. Fe-Mo-protein part of nitrogenase enzyme can also be called as _______.

• dinitrogen reductase
• dinitrogenase
• reductase
• dinitrogen

6. Preparation of microorganism which on adding to the soil to improve the fertility of the soil is known as _______.

• biofertilizers
• vermicompost
• fertilizers
• composting

7. Biofertilizers which converts nitrogen into nitrogenous compound are called as ________ fixers

• dinitrogen
• nitrogen
• ammonia
• nitric acid

8. Which one of the following is considered to be the best nitrogen fixers for biofertilizers?

• Anabena
• Azomonas
• Rhizobium
• Azospirillum

9. who reported the suspension cultures from carrot root explant?

• Watson and Crick
• Steward and Shantz
• Benthaman and Hook
• Lederber and Tatum

10. What is a cloning vector?

• An agent used to transfer DNA from an in vitro solution into a living cell
• The sticky end of a DNA fragment
• The laboratory apparatus used to clone genes
• A DNA probe used to locate a particular gene in the genome

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Plant Biotechnology MCQs Part 8

1. ________ fixes molecular nitrogen in the roots of leguminous plant.

• Rhizobium species
• Bacillus species
• Clostridium species
• Staphylococcus species

2. Rizobium is a Gram ______ bacterium

• negative rod
• negative spherical
• positive rod
• positive spherical

3. Nodule bacteria were isolated by _______.

• Watson
• Crick
• Nitesh
• Beijernck

4. Nodule bacteria were isolated by Beijernck in ______.

• 1988
• 1888
• 1788
• 1688

5. Conversion of molecular nitrogen into ammonia by free living organism is called __________ nitrogen fixation.

• atmospheric
• industrial
• nonsymbiotic
• symbiotic

6. Conversion of molecular nitrogen into ammonia by organism in the root itself is called __________ nitrogen fixation.

• atmospheric
• industrial
• nonsymbiotic
• symbiotic

7. Non symbiotic nitrogen fixers are _______.

• bacteria
• virus
• fungi
• nematodes

8. Non symbiotic nitrogen fixing bacterium is _______.

• Anabena
• Azomonas
• Rhizobium
• Klebsiella

9. Non symbiotic nitrogen fixing cyanobacterium is _______.

• Anabena
• Azomonas
• Rhizobium
• Klebsiella

10. Heterocyst is the structure present in _______.

• Anabena
• Azomonas
• Rhizobium
• Azospirillum

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Animal Biotechnology MCQs Part 10

1. Which statement is NOT true about a retrovirus?

• It may cause cancer or AIDS
• It contains reverse transcriptase
• It is known to cause diseases only in animals, not in humans
• It has the capacity to integrate cDNA into the host DNA of the cell it infects

2. Blood cells that transport oxygen within the body are the _____________ .

• plasma
• erythrocytes
• platelets
• leukocytes

Plant Biotechnology MCQs Part 7

1. Gene silencing is generally termed as __________ of genes.

• switching off
• switching on
• absence
• presence

2. Production of ethylene is inhibited by antisense gene________.

• glyphoshate
• ACC synthase
• ACC synthatase
• lyase

3. ____________ is responsible for fruit ripening.

• Glyphoshate
• ACC synthase
• ACC synthatase
• Polygalacturonidase

4. Which one of the following technique is used to produce Flavr Savr tomato?

• rDNA technology
• Trangenesis
• Antisense RNA technology
• rRNA technology

5. Preservation of germplasm in the frozen state is termed as _______.

• cryoprectectant
• cryopreservation
• preservation
• storage

6. Conversion of molecular nitrogen into nitrogenous compound is called as _______.

• nitrogen fixation
• nitrogen adsorption
• nitrogen dissociation
• nitrogen absorption

7. Conversion of molecular nitrogen into nitrogenous compound through lightening is called as __________ nitrogen fixation.

• atmospheric
• industrial
• biological
• symbiotic

8. Conversion of molecular nitrogen into nitrogenous compound through chemical is called __________ nitrogen fixation

• atmospheric
• industrial
• biological
• symbiotic

9. Conversion of molecular nitrogen into nitrogenous compound through living organism is called __________ nitrogen fixation

• atmospheric
• industrial
• biological
• symbiotic

10. Which one of the following is NOT nitrogen fixer?

• Rhizobium species
• Bacillus species
• Clostridium species
• Staphylococcus species

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Plant Biotechnology MCQs part 6

1. Who first succeeded in promoting the development of callus tissue?

• Gautheret
• Nobecourt
• Can Overbeek
• Conklin

2. Which of the below statement is CORRECT for the callus culture?

• Aseptic preparation of plant material
• Selection of suitable nutrient medium
• Incubation of culture
• All the above

3. For callus culture the manipulation sequence forceps, scalpels must kept in _____% ethanol.

• 90
• 95
• 80
• 85

4. The callus tissue formation is processed through _______ of the explant.

• cell alteration
• cell lengthening
• cell expansion
• cell stringent

5. 2, 4-D alone is sufficient for _______ culture.

• callus
• organ
• anther
• pollen

6. _______ is required for growth of cell.

• Gibberrellin
• Auxin
• Cytokinin
• Ethylene

7. _____ is required for cell division

• Gibberrellin
• Auxin
• Cytokinin
• Ethylene

8. Callus is yellow due to synthesis of ______ pigments

• carotenoid
• anthocyanin
• chlorophyll
• phycocyanin

9. Callus is purple due to accumulation of ____________.

• carotenoid
• anthocyanin
• chlorophyll
• phycocyanin

10. Which one of the following is a type of culture in which single cells or small aggregates of cells multiply?

• Micropropagation
• Organogenesis
• Callus culture
• Suspension culture

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Biochemistry MCQs part 1

1. A drug which prevents uric acid synthesis by inhibiting the enzyme xanthine oxidase is

• Aspirin
• Allopurinol
• Colchicine
• Probenecid

2. Which of the following is required for crystallization and storage of the hormone insulin?

• Mn⁺⁺
• Mg⁺⁺
• Ca⁺⁺
• Zn⁺⁺

Plant Hormones MCQs Part 4

1. The Greek root words meaning "plant" and "color" are the basis for the term

• auxin
• tropism
• nastic
• phytochrome

2. How do some plants seeds "know" when it is day and night, and perhaps when to germinate?

• They chemically count the circadian cycles
• All plant hormones are products of photosynthetic systems
• Photosynthetic rates provide direct evidence of sun-produced food
• Phytochromes cycle between red and far-red absorption and light levels can inhibit germination

3. Gravitropism in roots

• is positive when plant roots grow downward
• is due to statoliths in the root cap cells
• is due to amyloplasts
• All of the choices are true

4. Apical dominance in plants is due to which of the following plant hormones?

• ethylene
• gibberellin
• auxins
• cytokinins

5. Which of the following is/are true regarding gibberellins?

• there are about 70 chemically different gibberellins
• are growth promoters causing stem elongation
• these hormones can break seed and bud dormancy
• all of the choices are true

6. Cytokinins

• are plant hormones that promote cell division
• are used in combination with auxin to produce plants from undifferentiated callose tissue
• also work with oligosaccharins to effect tissue differentiation
• All of these are true regarding cytokinins

7. which of the plant hormones ripens fruit and control abscission

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

8. Hormone which induces amylase production in seeds

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

9. Hormone which affects stomatal response to water stress

• Auxin
• Gibberellin
• Abscisic acid
• Ethylene

10. Hormone which promotes cell division

• Gibberellin
• Abscisic acid
• Ethylene
• Cytokinin

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Correct answers:

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Photosynthesis MCQs part 5

1. In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?

• energy released as electrons flow through the electron transport system
• energy released from substrate-level phosphorylation
• energy released from ATP synthase pumping hydrogen ions against their concentration gradient
• energy released from movement of protons through ATP synthase

2. Energy released by the electron transport chain is used to pump H+ ions into which location?

• cytosol
• mitochondrial outer membrane
• mitochondrial inner membrane
• mitochondrial intermembrane space

3. During aerobic cellular respiration, a proton gradient in mitochondria is generated by ____ and used primarily for ____.

• the electron transport chain, ATP synthesis
• the electron transport chain, substrate-level phosphorylation
• glycolysis, production of H₂O
• fermentation, NAD⁺ reduction

4. The direct energy source that drives ATP synthesis during respiratory oxidative phosphorylation is

• oxidation of glucose to CO₂ and water
• the thermodynamically favorable flow of electrons from NADH to the mitochondrial electron transport carriers
• the final transfer of electrons to oxygen
• the difference in H⁺ concentrations on opposite sides of the inner mitochondrial membrane

5. Where is ATP synthase located in the mitochondrion?

• cytosol
• outer membrane
• electron transport chain
• inner membrane

6. In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

• ATP, CO₂ and ethanol (ethyl alcohol)
• ATP, CO₂, and lactate
• ATP, NADH, and pyruvate
• ATP, pyruvate, and oxygen

7. You have a friend who lost 7 kg (about 15 pounds) of fat on a "low carb" diet. How did the fat leave her body?

• It was released as CO₂ and H₂O
• Chemical energy was converted to heat and then released
• It was converted to ATP, which weighs much less than fat
• It was broken down to amino acids and eliminated from the body

8. Organisms that can exist with light as an energy source and an inorganic form of carbon and other raw materials

• are called photoautotrophs
• do not exist in nature
• are called heterotrophs
• are best classified as decomposers

9. Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

• CO₂ and glucose
• H₂O and O₂
• ADP, Pi, and NADP⁺
• ATP and NADPH

10. What is the primary function of the light reactions of photosynthesis?

• to produce energy-rich glucose from carbon dioxide and water
• to produce ATP and NADPH
• to produce NADPH used in respiration
• to convert light energy to the chemical energy of PGAL

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Plant Hormones MCQs Part 3

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Animal Biotechnology MCQs Part 7

1. Which of the following is an example of cell devoid of nuclear membrane and mitochondria ?

• Bacterial cell
• Sperm
• Protist
• Sponge cell

2. Animal cell differs from plant cells in possessing __________

• plastid
• golgi body
• vacuole
• centrosome

Plant Biotechnology MCQs part 5

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Plant Biotechnology MCQs part 4

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