GATE BT topic:biotechnology PYQs & Answers — Page 32

Questions 311–320 of 650. Imported answers require independent review unless marked reviewed.

Which of the following statement(s) is(are) CORRECT regarding the lac operon in E. coli when grown in the presence of glucose and lactose?

Your answerSelect all correct options. You can choose more than one.

At low glucose level, the operon is activated

At high glucose level, the operon is activated to enable the utilization of lactose

The lac repressor binds to operator region inactivating the operon

Binding of lactose to the lac repressor induces the operon

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Emerging viruses such as SARS-CoV2 cause epidemics. Which of the following process(es) contribute to the rise of such viruses?

Your answerSelect all correct options. You can choose more than one.

Mutation of existing virus

Jump of existing virus from current to new hosts

Spread of virus in the new host population

Replication of virus outside a host

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Introduction of foreign genes into plant cells can be carried out using

Your answerSelect all correct options. You can choose more than one.

Agrobacterium

CaCl₂ mediated plasmid uptake

Electroporation

Gene gun

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Which of the following statement(s) regarding trafficking in eukaryotic cells is(are) CORRECT?

Your answerSelect all correct options. You can choose more than one.

Dynamin binds GTP and is involved in vesicle budding

Dynamin is involved in cytoskeletal remodeling

Dynein binds ATP and is involved in movement of organelles along microtubules

Dynein binds GTP and is involved in movement of organelles along microtubules

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Consider a random variable

with mean

and variance

. A new random variable

is defined. The variance of the random variable

(rounded off to one decimal place) is ____________________.

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For

and

, the value of

is ____________.

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Figure below depicts simplified metabolic and transport reactions taking place in the production of B from A in a cell. The subscript ‘i’ refers to intracellular metabolites.

is the

reaction flux in

. Under pseudo-steady-state condition, the following reaction fluxes are available.

and

The transport flux of B,

, is ______________

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The amount of biomass in a reactor at the end of the batch process is 50 g. Fed-batch operation is initiated by feeding the substrate solution at a constant rate of 1 L h

. The concentration of substrate in the feed is 50 g L

. The maximum biomass yield (

) is 0.4

. Assuming the system is at quasi-steady state, the maximum amount of biomass after 5 h of feeding is ____________ g.

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An enzyme catalyzes the conversion of substrate A into product B. The rate equation for this reaction is

Substrate A at an initial concentration of 10 mol L

enters an ideal mixed flow reactor (MFR) at a flow rate of 10 L min

. The volume of the MFR required for 50% conversion of substrate to product is __________ L.

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Liquid-phase mass transfer coefficient (

) is measured in a stirred tank vessel using steady-state method by sparging air. Oxygen uptake by the microorganism is measured. The bulk concentration of O

mol L

. Solubility of O

in water at 25 °C is

mol L

If the oxygen consumption rate is

mol L

, and interfacial area is 100 m

, the value of

is __________ cm s

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GATE BT topic:biotechnology PYQs

Question 51

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Question 54

Question 55

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Question 58

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Question 60