1
The arrow illustrates
A. ArmB. Shoulder
Microbiology lab proctored examMicrobiology Lab Proctored Exam
30 questions · Page 1 of 2
Microbiology Lab Proctored Exam is a nursing-school practice exam with 30 questions. It is written for nursing students preparing for this course exam and for NCLEX-style review. Every question has its own page showing the full stem, all answer options, the correct answer, and a written rationale explaining why each option is right or wrong.
Topics covered on this page: Microbiology lab proctored exam.
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Start Practice ExamQuestions 1–25 of 30
2
The label arrow illustrate
A. coarse adjustmentB. Fine adjustment
Microbiology lab proctored exam3
The fine adjustment knob is used to sharpen the image after it has been focused with the coarse adjustment knob
A. TrueB. False
Microbiology lab proctored exam4
What is the total magnification when using a 10x eyepiece and a 40x objective lens?
A. 40xB. 100xC. 400xD. 4,000x
Microbiology lab proctored exam5
What instruments are used to perform sterile transfer from one medium to another
A. Loop & needleB. Loop & syringeC. needle & syringeD. all above are true
Microbiology lab proctored exam6
Name this structure
A. Petri dishB. Agar plate
Microbiology lab proctored exam7
The isolation streak plate technique is used to separate individual bacterial cells on an agar plate.
A. TrueB. False
Microbiology lab proctored exam8
The goal of streaking is to Not evenly spread bacteria, so they grow in a thick, continuous layer:
A. TrueB. False
Microbiology lab proctored exam9
What is the main purpose of simple staining?
A. To differentiate between Gram-positive and Gram-neB. To determine bacterial motilityC. To visualize the size, shape, and arrangement of bD. To identify bacterial endospores
Microbiology lab proctored exam10
Which of the following dyes is commonly used in simple staining?
A. SafraninB. Methylene blueC. Malachite greenD. Carbol fuchsin
Microbiology lab proctored exam11
Why is heat fixing performed during smear preparation?
A. To stain the bacteriaB. To kill bacteria and adhere them to the slideC. To increase magnificationD. To remove excess stain
Microbiology lab proctored exam12
Why must the smear be completely air-dried before heat fixing?
A. To prevent distortion of cellsB. To speed up stainingC. To make the bacteria growD. To increase contrast
Microbiology lab proctored exam13
Who developed the Gram stain technique?
A. Louis PasteurB. Robert KochC. Hans Christian GramD. Alexander Fleming
Microbiology lab proctored exam14
After Gram staining, Gram-positive bacteria appear:
A. PinkB. RedC. PurpleD. Colorless
Microbiology lab proctored exam15
Gram-negative bacteria appear what color after Gram staining?
A. PurpleB. BlueC. Pink/RedD. Green
Microbiology lab proctored exam16
Gram-positive bacteria have a cell wall that contains:
A. A thin peptidoglycan layerB. A thick peptidoglycan layerC. No peptidoglycanD. An outer membrane only
Microbiology lab proctored exam17
Gram-negative bacteria differ from Gram-positive bacteria because they have:
A. A thick peptidoglycan layerB. No cell wallC. An outer membrane containing lipopolysaccharide (LD. Teichoic acids in their cell wall
Microbiology lab proctored exam18
Why do Gram-positive bacteria retain the crystal violet stain?
A. Their outer membrane traps the stainB. Their thick peptidoglycan layer holds the crystal C. They absorb the safranin more stronglyD. They do not undergo decolorization
Microbiology lab proctored exam19
The plate shown below is known as:
A. Blood agar plate (BAP)B. M17 Agar
Microbiology lab proctored exam20
Hemolysins are bacterial toxins that lyse red blood cells.
A. TrueB. False
Microbiology lab proctored exam21
A 7-year-old child presents with fever, sore throat, and swollen anterior cervical lymph nodes.
A. A throat swab is cultured on blood agar. After 24 B. Alpha hemolysisC. Beta hemolysisD. Gamma hemolysis
Microbiology lab proctored exam22
Hemolysins are best defined as:
A. Enzymes that inhibit bacterial growthB. Toxins that lyse red blood cellsC. Structural proteins in bacterial capsulesD. Antibiotic resistance factors
Microbiology lab proctored exam23
EMB agar is considered selective because:
A. It enhances growth of Gram-positive bacteriaB. It contains dyes that inhibit Gram-positive organiC. It only supports anaerobic growthD. It contains high salt concentration
Microbiology lab proctored exam24
A stool sample from a patient with diarrhea is cultured on EMB agar. The colonies are colorless and translucent. What does this indicate?
A. Strong lactose fermentationB. Partial lactose fermentationC. Non-lactose fermentationD. Hemolysis
Microbiology lab proctored exam25
Which component of EMB agar is primarily responsible for inhibiting Gram-positive bacteria?
A. LactoseB. AgarC. Eosin and methylene blue dyesD. Sodium chloride
Microbiology lab proctored exam