BIOL 2420 Exam 2

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A pure culture contains only

A pure culture contains only

One species of microorganism

In the Gram

staining procedure, the primary stain is

The specimen preparation that is best for viewing cell motility is

Hanging drop

The term that refers to the presence of flagella all over the cell surface is

Peritrichous

_____ is another term for biosynthesis.

Anabolism

The Gram stain, acid

fast stain, and endospore stain ____.

The human body typically begins to be colonized by its normal flora

During, and immediately after birth

Photosynthetic organisms convert the energy of ____ into chemical energy

Photons

The time from when pathogen first enters the body and begins to multiply, until symptoms first appear is the

Incubation period

The short, numerous appendages used by some bacterial cells for adhering to surfaces are called

Fimbriae

A prokaryotic cell wall that has primarily peptidoglyn with small amounts of teichoic acid and lipoteichoic acid is

Gram

Each of the following are true of enzymes except

They increase the activation energy of a reaction

A disease that has a steady frequency over time in a population is

Endemic

Which of the following characteristics refers to the microscope's ability to show two separate entities as separate and distinct?

Resolving power

The primary purpose of staining cells on a microscope slide is to

Add contrast in order to see them better

Which microscope achieves the greatest resolution and highest magnification?

Electron

Endogenous infectious agents arise from microbes that are

The patient's own normal flora

Feedback inhibition is best described as

Product binding to enzyme in non

If bacteria living in salty seawater were placed to a freshwater environment, the cell structure that would prevent, the cells from rupturing is

Cell wall

The most immediate result of destruction of a cell's ribosomes would be

Protein synthesis would stop

Local edema, swollen lymph nodes, fever, soreness, and abscesses are indications of

Inflammation

The study of the frequency and distribution of a disease in a defined population is

Epidemiology

A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?

The culture is contaminated

If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?

95X

An animal, such as an arthropod, that transmits a pathogen from one host to another is a

Vector

All of the following structures contribute to the ability of pathogenic bacteria to cause disease, except

Inclusions

Enzymes are

Proteins that function as catalysts

Enzymes that are only produced when substrate is present are termed

Induced enzymes

Virulence factors include all the following, except

Ribosomes

Spirochetes have a twisting and flexing locomotion due to appendage called

Periplasmic flagella (axial filaments)

The type of microscope in which you would see brightly illuminated specimens against a black background is

Dark field

Infection occurs when

Pathogens enter and multiply in body tissues

Lipopolysaccharide is an important cell wall component of

Gram

The property of organisms to integrate catabolic and anabolic pathways to improve cell efficiency is called

Amphibolism

Basic dyes are

attracted to the acidic substance of bacterial cells

A 30x objective and a 20x ocular produce a total magnification of

600x

Enzymes that are secreted by a cell to hydrolyze reactions are

Exoenzymes

The body sites with resident flora that produces beneficial body products, including vitamin k and several other vitamins is the

Large intestine

Which is not the terminology used for resident flora?

Pathogenic flora

Which is mismatched?

Plasmids

An example of a glycocalyx is

A capsule

The subjective evidence of disease sensed by the patient is termed

Symptom

Which of the following is presents in both gram

positive and gram

All bacterial cells have

A chromosomes

The stages of infectious disease when specific signs and symptoms are seen and the pathogen is at peak activity is

Period of invasion

Enzymes that are always present, regardless of the amount of substrate are

Constitutive enzymes

Which is immersion oil often used when viewing specimens under the microscope?

To increase the resolution

The initial, brief period of early, general symptoms such as fatigue and muscle aches, is the

Prodromal stage

The term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is

Inoculation

Which type of medium is able to distinguish different species or typed of microorganisms based on an observable change in the colonies or in the medium?

Differential