Practice Questions

TLS Online TPP Program

#Question id: 40413

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): After the washing with alcohol (decolorization step), Gram-positive bacteria retain the purple color, while Gram-negative bacteria become colorless.
Reason (R): Gram-positive bacteria have a thick peptidoglycan layer that traps the Crystal Violet-Iodine complex, whereas Gram-negative bacteria have a high lipid content in their outer membrane which dissolves in alcohol.

#Applied Microbiology

Both (A) and (R) are correct and (R) is the correct explanation of (A).
Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
(A) is correct but (R) is not correct.
(A) is not correct but (R) is correct.

More Questions

TLS Online TPP Program

#Question id: 37865

#Plant Biotechnology

Statement I: During the lag phase, the cell number or biomass increases rapidly.

Statement II: The duration of the lag phase depends mainly on the size of the inoculum and the growth phase of the source culture.

In light of the above statements, choose the correct answer from the options given below:

TLS Online TPP Program

#Question id: 37866

#Plant Biotechnology

Given below are two statements regarding the Log phase:

Statement I: The log phase is characterized by a rapid increase in cell number. Statement II: This phase typically lasts for about 10 to 15 generations.

In light of the above statements, choose the correct answer from the options given below:

TLS Online TPP Program

#Question id: 37867

#Plant Biotechnology

Given below are two statements:

Statement I: The duration of cell generation in the log phase is constant at 12 hours for all plant species.

Statement II: The stationary phase is the final phase during which the cell number does not change.

In light of the above statements, choose the correct answer from the options given below:

TLS Online TPP Program

#Question id: 37868

#Plant Biotechnology

Given below are two statements regarding the sequence of growth:

Statement I: The log phase is immediately followed by the lag phase.

Statement II: The stationary phase is characterized by a rapid decrease in biomass.

In light of the above statements, choose the correct answer from the options given below:

TLS Online TPP Program

#Question id: 37869

#Plant Biotechnology

Which of the following parameters primarily determines the duration of the lag phase?

Statement I: The size of the inoculum.

Statement II: The growth phase of the culture from which the inoculum was taken.

Choose the correct combination:

TLS Online TPP Program

#Question id: 37870

#Plant Biotechnology

Given below are two statements:

Statement I: The replacement volume in an open continuous culture is adjusted to keep the culture at submaximal growth indefinitely.

Statement II: Continuous culture systems maintain a steady state by replacing a portion of spent medium with fresh medium.

In the light of the above statements, choose the most appropriate answer from the options given below: