Biochemical Engineering

Question: Stirred tank fermenter (STF) can be employed for
[A].

aerobic fermentation of a wide range of cells including microbial, animal and plant cells

[B].

anaerobic fermentation of a wide range of cells including microbial, animal and plant cells

[C].

Both (a) and (b)

[D].

anaerobic fermentation of plant cells only

Answer: Option C

Explanation:

No answer description available for this question.

Question: The number of baffles in a standard stirred tank bioreactor is
[A].

8

[B].

6

[C].

4

[D].

2

Answer: Option C

Explanation:

No answer description available for this question.

Question: The diameter of the baffles in a standard stirred tank bioreactor ranges from
[A].

1/10th – 1/12th of the tank diameter

[B].

1/3rd – 1/4th of the tank diameter

[C].

1/15th – 1/20th of the tank diameter

[D].

1/20th – 1/25th of the tank diameter

Answer: Option A

Explanation:

No answer description available for this question.

Question: Why a T-flask used in small-scale cell culture is incubated in a horizontal position?
[A].

To save space

[B].

To increase the surface area of the liquid-air interface

[C].

Both (a) and (b)

[D].

To increase the rate of oxygen transfer into the liquid

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the specific growth rate, μ. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as
[A].

Cn= Cn0 exp[μ (t – t0)]

[B].

Cn0 = Cn exp[μ (t – t0)]

[C].

Cn/Cn0 =(1/μ)exp(t-t0)

[D].

Cn0 / Cn = (1/μ)exp(t-t0)

Answer: Option A

Explanation:

No answer description available for this question.

Question: The phenomenon in which substrates are used in a sequential manner is known as
[A].

trans-substrate genesis

[B].

dialism

[C].

diauxie

[D].

multiplicity

Answer: Option C

Explanation:

No answer description available for this question.

Question: The application of just in time (JIT) manufacturing techniques in biotechnology is important because
[A].

raw materials used in biotechnology are biodegradable

[B].

the products of biotechnology are biodegradable

[C].

it is a very competitive business (d) all of the above

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
[A].

increase the overall fermentation time

[B].

increase the overall yield of biomass

[C].

decrease the overall fermentation time

[D].

decrease the overall yield of product

Answer: Option C

Explanation:

No answer description available for this question.

Question: During the exponential phase the maximum specific growth rate equals specific growth rate as
[A].

concentration of the growth limiting substrate is much less than the monod constant

[B].

concentration of growth limiting substrate is much greater than the monod constant

[C].

specific growth rate increases exponentially

[D].

concentration of the growth limiting substrate is equal to the monod constant

Answer: Option B

Explanation:

No answer description available for this question.

Question: The maximum specific growth rate (μm) of an organism in batch culture is equal to slope of a plot of
[A].

In [biomass] against time for exponential phase data only

[B].

In [biomass] against time

[C].

biomass against time

[D].

biomass against time for stationary phase data only

Answer: Option A

Explanation:

No answer description available for this question.