Arrange the following phases of microbial growth curve in correct sequence : (A) Logarithmic or exponential phase (B) Negative acceleration (C) Lag phase (D) Positive acceleration (E) Maximal stationary phase Choose the correct answer from the options given below :
Microbial Growth Curve Phases Sequence
The microbial growth curve tracks population changes over time. Identifying the correct sequence of its phases is fundamental in microbiology.
Phase Ordering Explained
The phases are arranged based on the progression of microbial population dynamics:
- Lag Phase (C): Initial phase; microbes adjust to the new environment, showing minimal population increase.
- Positive Acceleration (D): Growth rate begins to increase as microbes adapt and prepare for rapid multiplication.
- Logarithmic or Exponential Phase (A): Period of maximum growth rate; population size increases exponentially.
- Negative Acceleration (B): Growth rate starts to decline due to factors like nutrient depletion or waste accumulation.
- Maximal Stationary Phase (E): Population growth plateaus; the rate of cell division equals the rate of cell death.
Correct Sequence Confirmation
The correct sequence integrating the given terms is:
(C) Lag phase → (D) Positive acceleration → (A) Logarithmic or exponential phase → (B) Negative acceleration → (E) Maximal stationary phase
This order represents the progression from initial adaptation through rapid growth to a stabilized population.
Important Questions from Microscopic techniques
In electron microscopy, to detect specific macromolecule or structure such as spindle pole body (SPB), the frequently used procedure is to couple secondary antibody with
Which of the following components is typically NOT utilized while capturing images using a confocal laser scanning microscope (CLSM)?
The following statements were made about Laser Scanning Confocal Microscopy (LSCM).
A. LSCM is a wide field technique with Köhler illumination system.
B. Spatial resolution higher than that achieved in wide field imaging could be obtained if only the central portion of an Airy Disk is used to form an image.
C. Scanning mirrors sweep the excitation beam over the sample point-by-point to build the image.
D. An altered pinhole size does not make any impact on the resolution of the image.
E. A photomultiplier tube (PMT) in LSCM helps in generating real colour of fluorophores.
Which one of the following options represents the combination of all correct statements?
- Excitation filter, dichroic mirror and barrier filters are the parts of which of the following microscope?
- A side-by-side view of two specimens can be best obtained by the:________
