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Exam 6: Microbial Nutrition and Growth

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Question 51

True/False

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Whether an organism is a phototroph or a chemotroph depends on its source of energy.

A) True
B) False

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Question 52

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At 12:35 pm,20 Salmonella enteritidis cells were present in the remains of a Caesar salad at a picnic.5 hours later,the picnic organizer ate the rest of the salad at home.  S.enteritidis divides every 20 minutes; how many cells (Nt) were consumed if Nt = N(2ⁿ) ?

A) 655,360 cells
B) 100 cells
C) 327,680 cells
D) 1,000,000 cells
E) 1 x 10¹⁵ cells

F) A) and C)
G) All of the above

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Question 53

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An 85-year-old female in a long-term care facility is prescribed verapamil for blood pressure management twice daily. The medication is classified as a calcium channel blocker. -Prior to administration of the scheduled morning dose of verapamil,the patient's blood pressure is found to be low.What is the most appropriate action by the RN?  

The term autotroph refers to an organism that ________.

The degree of turbidity in a culture correlates to the amount of cell growth.

What type of media is used to demonstrate oxygen requirements of microbes?

Cultures of a bacterial species were incubated on the shelf of a refrigerator,out on a lab bench top,on the shelf of a 37°C incubator,and on the shelf of a 50°C incubator.After incubation,there was no growth at 37°C and 50°C,very slight growth out on the bench top,and abundant growth at refrigeration.What term could be used for this species?

A microaerophile ________.

Obligate saprobes can adapt to a living host.

A 24-year-old male arrives at the emergency department via air transport after sustaining a fall while rock climbing. The patient is unresponsive with sluggishly reactive pupils upon arrival. His right arm and bilateral lower extremities have obvious fractures. He was intubated by EMS and requires mechanical ventilation. A CT scan reveals multiple head bleeds and intracranial swelling with a midline shift. The patient is rushed to surgery with the plan to relieve the pressure of the intracranial swelling. -The generation time for Enterobacter aerogenes during the exponential growth phase is 30 minutes.  If a single E.aerogenes cell begins dividing during this phase,how many cells would be present if counted after 5 hours?

The phase of the bacterial growth curve in which the rate of cell division equals the rate of cell death is the ________.

When whole cells or large molecules in solution are engulfed by a cell,this endocytosis is specifically termed ________.

Facilitated diffusion is limited by ________.

The toxic superoxide ion is converted to harmless oxygen by two enzymes,  ________.

In a commensal relationship,the commensal benefits but the cohabitant is neither harmed nor benefited.

The direct cell count,using a cytometer,can calculate viable cell numbers from a sample.

A Coulter counter can count viable cells as well as determine the size.

The hospital infectious disease team is involved with the study of a healthcare-associated infection that has spread to 10% of inpatients. The infected patients are exhibiting symptoms of severe abdominal cramping, diarrhea, nausea, and vomiting. The RN on the infectious disease team provides education to staff regarding the pattern of bacterial growth and methods of infection control. -The RN educates the staff about the importance of timely symptom recognition and treatment of the infection.Which of the following statements by a hospital provider demonstrates a proper understanding of antimicrobial agents?

An 85-year-old female in a long-term care facility is prescribed verapamil for blood pressure management twice daily. The medication is classified as a calcium channel blocker. -Which of the following is a characteristic of active transport?  

Most microorganisms on earth can only live and survive in habitats that are similar to human body conditions.