Biochemical Engineering

Question: Which of the following(s) is/are considered the limitations of the exponential growth model?
[A].

Only predicts that cells grow exponentially during the log phase

[B].

It does not consider factors that causes cells growth to stop or slow

[C].

Predicts cell growth at a linear rate

[D].

All of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following is an example of a mathematical model?
[A].

Volume of cuboid = length x breadth x height

[B].

The Monod Model

[C].

The Michaelis Menten Equation

[D].

All of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: In the death phase
[A].

nutrients available for the cells are depleted and begin to die

[B].

the number of viable cells will increase

[C].

nutrients available for cells are replenished and start to multiply

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the accelerated phase, cell starts to
[A].

increase and the division rate increases to reach a maximum

[B].

decrease and the division rate increases to reach a maximum

[C].

increase and the division rate decreases to reach a maximum

[D].

increase and the division rate increases to reach a minimum

Answer: Option A

Explanation:

No answer description available for this question.

Question: Stationary phase is described as
[A].

no further increase in the cell population after a maximum value

[B].

deceleration of growth and division rate after the growth rate reaches a maximum

[C].

acceleration of growth and division rate after the growth rate reaches a maximum

[D].

deceleration of growth and division rate after the growth rate reaches a minimum

Answer: Option A

Explanation:

No answer description available for this question.

Question: During the log phase cell numbers increase exponentially
[A].

because cells produce enzymes

[B].

because cells do not have cell membranes

[C].

because cells are autocatalysts

[D].

because the rate of cell division increases exponentially

Answer: Option C

Explanation:

No answer description available for this question.

Question: Biomass concentrations during fermentation is
[A].

diluting the samples to optical density less than 0.3

[B].

monitored by controlling the changes in biomass concentrations

[C].

considering that optical density is proportional to the surface area of the biomass in the sample

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: The optical density sometimes drops during the lag phase because
[A].

cells tend to grow without dividing leading to a decrease in the surface area to volume ratio

[B].

of fast cell growth causing them to fill up with DNA

[C].

cells swell up with water

[D].

cells swell up with RNA

Answer: Option A

Explanation:

No answer description available for this question.

Question: Diauxie is
[A].

growth factors

[B].

microbiological die off

[C].

the simultaneous uptake of nutrients

[D].

the stagewise uptake of nutrients

Answer: Option D

Explanation:

No answer description available for this question.

Question: During the lag phase
[A].

cells just start growing

[B].

cells synthesize new proteins and membrane components

[C].

cells produce antibiotics to kill competing organisms

[D].

cells simply grow slowly

Answer: Option B

Explanation:

No answer description available for this question.