A Microbiologist Is Attempting to Determine the Size of a Microbial

question 47

Multiple Choice

A microbiologist is attempting to determine the size of a microbial population and has employed several methods.She noticed that the direct count she obtained using a counting chamber and microscope was much higher than her estimate from doing a viable plate count.This discrepancy was encountered during multiple trials.What is the most likely reason for the discrepancy?

• A)She counted incorrectly.
• B)She did not correctly do the serial dilutions prior to the viable plate count.
• C)Many of the organisms viewed during the direct count may be dead.
• D)The medium and growth conditions used for the viable count will not support the growth of the organisms.
• E)The organisms were not readily cultured on the viable count,either because many were dead or because the medium and growth conditions used for the viable count will not support the growth of the microorganism.

---

Definitions:

Major Organic Product

In a chemical reaction, it refers to the predominant outcome or compound produced in the highest amount compared to any side products.

Activating Power

Refers to the ability of a group attached to a benzene ring to increase its reactivity towards electrophilic aromatic substitution by making the ring electrons more available.

Electrophilic Aromatic Substitution

A reaction where an aromatic compound's hydrogen is replaced by an electrophile, often facilitated by the stability of the aromatic system.

Interviews

A method of data collection involving direct, face-to-face conversation or questioning between interviewer and respondent to gather information.