A Microbiologist Is Working with Two Genera of Bacteria,A and B,to

question 64

Multiple Choice

A microbiologist is working with two genera of bacteria,A and B,to determine if cells are competent.Strains are grown under optimal conditions,and DNA fragments that carry the gene for green fluorescent protein is added to each culture at 20-minute intervals.Samples from each treatment are plated to nutrient agar and incubated,after which the plates are examined under an ultraviolet lamp.The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent,while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies.What can be concluded from these results?

• A)Both bacteria A and bacteria B cells are competent.
• B)Competence in bacteria A is constitutively expressed.
• C)Competence in bacteria B is dependent on the phase of growth.
• D)Neither bacteria A nor bacteria B cells are competent.

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Definitions:

Average Collection Period

The average number of days it takes for a company to collect payments from its customers, a measure of the efficiency of its credit policies.

Current Ratio

A liquidity ratio that measures a company's ability to pay short-term obligations with its short-term assets.

Quick Ratio

A measure of a company's short-term liquidity, calculated as (Current Assets - Inventory) / Current Liabilities, indicating how well a company can meet its short-term financial liabilities.

Days' Sales in Inventory

A financial metric that estimates how long it takes for a company to turn its inventory into sales.