East Los Angeles College » Microbiology » Microbiology 020 - General Microbiology » Winter 2022 » Lecture Exam 1

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Question #1

The Dutch merchant who made and used quality magnifying lenses to see and record microorganisms was _____.

A. Robert Koch

B. Francesco Redi

C. Louis Pasteur

D. Joseph Lister

E. Antonie van Leeuwenhoek

Question #2

All of the following are lipids except _____.

A. triglyceride

B. starch

C. cholesterol

D. wax

E. phospholipid

Question #3

All microorganisms are best defined as organisms that ______.

A. are too small to be seen with the unaided eye

B. can only be found growing in laboratories

C. are infectious particles

D. lack a cell nucleus

E. cause human disease

Question #4

Koch's postulates are criteria used to establish that ______.

A. life forms can only arise from preexisting life forms

B. microbes can be used to clean up toxic spills

C. microbes are found on dust particles

D. a specific microbe is the cause of a specific disease

E. a specific microbe should be classified in a specific kingdom

Question #5

Cells, like bacteria and archaea, that do not have a nucleus in their cells have traditionally been called _____.

A. pathogens

B. decomposers

C. eukaryotes

D. fermenters

E. prokaryotes

Question #6

When humans manipulate the genes of microorganisms, the process is called _____.

A. epidemiology

B. genetic engineering

C. taxonomy

D. immunology

E. bioremediation

Question #7

Disease-causing microorganisms are called _____.

A. eukaryotes

B. prokaryotes

C. decomposers

D. pathogens

E. fermenters

Question #8

Despite the lack of a membrane-bound nucleus, bacteria and archaea are cells with a complex organizational structure.

A. FALSE

B. TRUE

Question #9

Which group of microorganisms is composed only of hereditary material wrapped in a protein covering?

A. Bacteria

B. Viruses

C. Helminths

D. Parasites

E. Fungi

Question #10

Select the correct descending taxonomic hierarchy:

A. genus, species,family

B. kingdom, domain,phylum

C. class, phylum,order

D. family, order,class

E. family, genus,species

Question #11

The most prevalent worldwide infectious diseases are _____.

A. diarrheal diseases

B. malaria diseases

C. AIDS-related diseases

D. respiratory diseases

E. measles

Question #12

Taxonomy does not involve _____.

A. taxa

B. common name

C. identification

D. classification

E. nomenclature

Question #13

Which statement correctly compares the sizes of different microorganisms?

A. Archaea are larger than eukaryotic microorganisms but smaller than bacteria

B. Bacteria are larger than eukaryotic microorganisms

C. Bacteria are larger than viruses

D. Eukaryotic microorganisms are smaller than viruses

Question #14

All proteins are enzymes.

A. FALSE

B. TRUE

Question #15

Most microorganisms that are found in and on humans do not cause harm and can sometimes benefit the host.

A. TRUE

B. FALSE

Question #16

Organic chemicals always have a basic framework of the element _____ bonded to other atoms.

A. carbon

B. hydrogen

C. nitrogen

D. phosphorous

E. oxygen

Question #17

Helminths are _____.

A. molds

B. parasitic worms

C. bacteria

D. protozoa

E. infectious particles

Question #18

A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on ________.

A. determining if that species is the cause of a new disease

B. bioremediation

C. nomenclature

D. determining evolutionary relatedness

E. recombinant DNA

Question #19

Nucleic acids have primary, secondary, tertiary, and quaternary levels of organization.

A. FALSE

B. TRUE

Question #20

Select the elements necessary for good microscopy.

A. Ability to observe cells in the living state, Adequate magnification, Specimen holder

B. Ability to observe cells in the living state, Use of wavelengths other than the visible spectrum, Specimen holder

C. Ability to observe cells in the living state, Contrast, Specimen holder

D. Adequate magnification, Contrast, Resolution

Question #21

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

A. phase contrast

B. bright field

C. electron

D. fluorescence

E. dark field

Question #22

Agar is a complex polysaccharide that comes from a(n) _____.

A. green plant

B. fungus

C. mold

D. algae

E. euglena

Question #23

Which type of media would be the best choice when shipping a sample of bacteria to a laboratory to be tested from a satellite office site?

A. Thioglycollate

B. General purpose

C. Blood

D. EMB

E. Transport

Question #24

Which type of microscope does not use light in forming the specimen image?

A. Electron

B. Bright field

C. Phase contrast

D. Dark field

E. Fluorescence

Question #25

A nutrient medium that contains at least one ingredient that is NOT chemically definable would be termed _____.

A. enriched

B. reducing

C. minimal

D. complex

E. synthetic

Question #26

Which of the following is not a benefit of agar as a solid medium?

A. Has flexibility

B. Is digested by most microbes

C. Holds moisture

D. Can be inoculated and poured at a temperature that is not harmful

E. Is solid at room temperature

Question #27

A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture medium. Following incubation, only the E. coli grows in the culture. What is the most likely explanation?

A. The culturemedium must be selective.

B. The culturemedium must be differential.

C. The culture iscontaminated.

D. The incubationtemperature was incorrect.

E. Themicrobiologist used too much inoculum.

Question #28

The specimen preparation that is best for viewing cell motility is ______.

A. flagellar stain

B. negative stain

C. Gram stain

D. fixed stained smear

E. hanging drop

Question #29

Which type of microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?

A. Phase contrast

B. Fluorescence

C. Differential interference contrast

D. Scanning electron

E. Transmission electron

Question #30

A microbiologist makes a fixed smear of bacterial cells and stains them with Loeffler's methylene blue. All the cells appear blue under the oil lens. This is an example of ______.

A. simple staining

B. negative staining

C. using an acidic dye

D. using the acid-fast stain

E. capsule staining

Question #31

Select the methods below that enable the isolation of bacteria.

A. Gram stain, Loop dilution, Spread plate, Use of selective media,

B. Loop dilution, Spread plate, Use of selective media, Quadrant streak plate

C. Gram stain, Bright-field microscopy, Spread plate, Use of selective media,

D. Gram stain, Loop dilution, Bright-field microscopy, Use of selective media,

Question #32

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

A. Refraction

B. All of thechoices are correct.

C. Resolving power

D. None of the choices are correct.

E. Magnification

Question #33

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

A. Reducing

B. Differential

C. Selective

D. Enumeration

E. Enriched

Question #34

A common medium used for growing fastidious bacteria is ______.

A. mannitol salt agar

B. a reducing medium

C. blood agar

D. MacConkey medium

E. trypticase soy agar

Question #35

All of the following pertain to the fluorescence microscope except ______.

A. it is a type of compound microscope

B. it requires the use of dyes like acridine and fluorescein

C. it uses electrons to produce a specimen image

D. it is commonly used to diagnose certain infections

E. it requires an ultraviolet radiation source

Question #36

Which of the following is not an inoculating tool?

A. Petri dish

B. Needle

C. Loop

D. Swab

E. Pipette

Question #37

Which of the following magnifies the specimen to produce its real image?

A. Condenser

B. Objective lens

C. Body

D. Nosepiece

E. Ocular lens

Question #38

Bacteria that require special growth factors and complex nutrients are termed _____.

A. anaerobic

B. fastidious

C. microaerophilic

D. autotrophic

E. aerobic

Question #39

A flagellum is anchored into the bacterial cell envelope by its _______.

A. hook

B. basal body

C. outer membrane

D. filament

E. sheath

Question #40

Which of the following is not true of the outer membrane?

A. The porinproteins create channels through the outer membrane.

B. Gram-positivebacteria have an outer membrane.

C. The lipid portionof the lipopolysaccharide layer is an endotoxin.

D. The innermost layer is a phospholipid bilayer.

E. The uppermost layer is made of lipopolysaccharides.

Question #41

Peptidoglycan is a unique macromolecule found in bacterial _______.

A. capsules

B. cell walls

C. cell membranes

D. slime layers

E. inclusions

Question #42

Endospores are ________.

A. living structures

B. resistant to destruction by radiation

C. All of the choices are correct.

D. metabolically inactive

E. resistant to heat and chemical destruction

Question #43

Each bacterial species represents a distinct organism that can produce viable offspring when mating with other bacteria of its kind.

A. FALSE

B. TRUE

Question #44

Lysozyme is most effective against _______.

A. cyanobacteria

B. archaea

C. gram-negative organisms

D. gram-positive organisms

E. mycoplasmas

Question #45

During the Gram stain, ______ cells decolorize when the alcohol is applied.

A. both gram-positive and -negative

B. gram-negative

C. gram-positive

Question #46

The chemical components of ribosomes are proteins and _______.

A. None of thechoices is correct.

B. All of thechoices are correct.

C. rRNA

D. mRNA

E. tRNA

Question #47

A bacterial cell wall that has primarily peptidoglycan with small amounts of teichoic acid and lipoteichoic acid is _______.

A. a spheroplast

B. gram-negative

C. acid fast

D. gram-positive

E. found in archaea

Question #48

A. flagella

B. cilia

C. fimbriae

D. sex pili

E. periplasmic flagella (axial filaments)

Question #49

When an endospore germinates, it develops into multiple vegetative cells ensuring reproductive success.

A. FALSE

B. TRUE

Question #50

Bacterial endospores are not produced by _______.

A. All of thechoices are correct.

B. Sporosarcina

C. Staphylococcus

D. Bacillus

E. Clostridium

Question #51

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

A. lophotrichous

B. atrichous

C. monotrichous

D. peritrichous

E. amphitrichous

Question #52

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

A. capsule

B. inclusions

C. LPS

D. slime layer

E. fimbriae

Question #53

Plasmids ________.

A. cannot be passed on to progeny

B. are often the site of pathogenic genes

C. cannot be passed between organisms

D. are found in all bacteria

E. are essential for growth and metabolism

Question #54

Which structure protects bacteria from being phagocytized by white blood cells?

A. Slime layer

B. Fimbriae

C. All of the choices are correct.

D. Capsule

E. Cell membrane

Question #55

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

A. periplasmic flagella (axial filaments)

B. sex pili

C. cilia

D. flagella

E. fimbriae

Question #56

Which term is not used to describe bacterial cell shapes?

A. Coccus

B. Spirochete

C. Rod

D. Tetrad

E. Vibrio

Question #57

The gram-positive cell wall is considered stronger than that of gram-negative cells since its hydrophobic outer membrane contains an endotoxin.

A. FALSE

B. TRUE

Question #58

Select characteristics exhibited by BOTH bacterial and eukaryotic cytoplasmic membranes.

A. Phospholipid bilayer, Transport systems, Selectively permeable barrier, and Embedded proteins

B. Transport systems, Selectively permeable barrier, and Sterols

C. Sterols, Transport systems and Phospholipid bilayer

D. Sterols, Selectively permeable barrier, and Embedded proteins

Question #59

When a eukaryotic cell is not undergoing mitosis, the DNA and its associated proteins appear as a visible network of dark fibers called the _____.

A. nuclear envelope

B. chromatin

C. nucleolus

D. nucleoplasm

E. nucleosome

Question #60

There are nine peripheral pairs and one central pair of _______ found inside eukaryotic flagella and cilia.

A. flagella

B. microtubules

C. cilia

D. filaments

E. None of the choices are correct.

Question #61

The cytoskeleton ________.

A. All of the choices are correct.

B. provides support

C. anchors organelles

D. functions in movements of the cytoplasm

E. helps maintain cell shape

Question #62

During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a(n) ______.

A. sporozoa

B. seed

C. cyst

D. trophozoite

E. endospore

Question #63

An organelle that is a stack of flattened, membranous sacs and functions to receive, modify, and package proteins for cell secretion is the ________.

A. Golgi apparatus

B. endoplasmic reticulum

C. chloroplast

D. mitochondria

E. lysosome

Question #64

Eukaryotic flagella differ from bacterial flagella because only eukaryotic flagella ________.

A. are used for cell motility

B. contain microtubules

C. facilitate phototaxis

D. facilitate chemotaxis

E. are long, whiplike structures

Question #65

Select all of the groups on this list that contain eukaryotic microorganisms.

A. Algae, Protozoa, Helminths, and Fungi

B. Protozoa, Bacteria, Viruses and Archaea

C. Bacteria, Viruses and Archaea

D. Protozoa, Bacteria, Viruses and Fungi

Question #66

The site for ribosomal RNA synthesis is the ______.

A. ribosome

B. Golgi apparatus

C. lysosome

D. nucleus

E. nucleolus

Question #67

Most fungi obtain nutrients from dead plants and animals. These fungi are called _______.

A. substrates

B. saprobes

C. parasites

D. nonseptate

E. dimorphic

Question #68

Fungi that grow as yeast at one temperature but will grow as mold at another temperature are called _______.

A. pseudohyphae

B. parasites

C. saprobes

D. dimorphic

E. spores

Question #69

Select the organisms that typically have cell walls.

A. Algae, Protozoa and Animals

B. Fungi, Protozoa and Animals

C. Protozoa and Animals

D. Algae, Plants, and Fungi

Question #70

Histones are ________.

A. on the surface of rough endoplasmic reticulum

B. proteins associated with DNA in the nucleus

C. enzymes found in lysosomes

D. found in polyribosomes

E. proteins of the cytoskeleton

Question #71

Which is mismatched?

A. Trichomonas—sexually transmitted vaginal infection

B. Naegleria—amoeba that causes brain infection

C. Plasmodium—protozoan that causes Chagas disease

D. Histoplasma—fungus that causes Ohio Valley fever

E. Giardia— causes intestinal distress; transmitted by feces in drinking water

Question #72

Filamentous fungi are called _______.

A. dimorphic

B. molds

C. septa

D. mycelium

E. pseudohyphae

Question #73

The motile, feeding stage of protozoa is called the _______.

A. trophozoite

B. oocyst

C. cyst

D. sporozoite

E. food vacuole

Question #74

All of the following are found in some or all protozoa except ________.

A. ectoplasm and endoplasm

B. motility

C. heterotrophic nutrition

D. cell wall

E. formation of a cyst stage

Question #75

Which is not a characteristic of fungi?

A. Can use a wide variety of nutrients

B. Photosynthetic

C. Have cell walls

D. Include single-celled and filamentous forms

E. Heterotrophic nutrition

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Microbiology 020 - General Microbiology » Winter 2022 » Lecture Exam 1 _Ch 1, 2, 3, 4

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