Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Microbiology Midterm / Microbiology Lab Exam 1, Exams of Microbiology

This document contains the answers to the first lab exam/ lab midterm. ALL CORRECT ANSWERS ARE HIGHLIGHTED. SOME QUESTIONS HAVE MORE THAN 1 ANSWER. QUESTIONS MAY BE SHUFFLED DUE TO THE PROFESSOR ON YOUR END.

Typology: Exams

2022/2023

Available from 08/10/2023

alexa-yk6
alexa-yk6 🇺🇸

5

(2)

24 documents

1 / 35

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Question 1 1 / 1 point
This is a multiple answer question. You must choose all that apply to receive
full credit.
This sample of unknown bacteria was stained using the Gram stain procedure.
What do the results tell you about the bacteria?
cocci in clusters
Gram positive
Gram negative
cocci in chains
rods in clusters
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21
pf22
pf23

Partial preview of the text

Download Microbiology Midterm / Microbiology Lab Exam 1 and more Exams Microbiology in PDF only on Docsity!

Question 1 1 / 1 point

This is a multiple answer question. You must choose all that apply to receive full credit. This sample of unknown bacteria was stained using the Gram stain procedure. What do the results tell you about the bacteria? cocci in clusters Gram positive Gram negative cocci in chains rods in clusters

Question 2 1 / 1 point

Immersion oil should be used with the 40x objective to minimize the loss of light, and help magnify the bacteria you are observing.

True

False

Question 3 1 / 1 point

Which of the following structures helps a bacterium escape phagocytosis by white blood cells?

flagella

a thick cell wall

capsule

endospore

Question 4 1 / 1 point

During the procedure of making a streak plate, the purpose of flaming the inoculating loop between streaks is? Sterilize the loop before going back into the original broth culture to get another loopful of bacteria to streak the next area on the plate Kill the bacteria on the loop resulting in fewer cells being moved across the agar into the next area

Question 6 1 / 1 point

What additional step is required when preparing a bacterial smear from a solid culture versus a liquid culture? You must heat fix multiple times You must use a lot more bacteria You must use a different kind of stain You must place a drop of water on the slide

Question 7 1 / 1 point

Endospores are involved in the reproduction of a bacteria.

True

False

Question 8 1 / 1 point

This is a multiple answer question. You must choose all correct answers to get full credit. What bacterial characteristics can you determine from the following image?

it has a capsule it contains an endospore the morphology is spirilli it has flagella

Question 9 1 / 1 point

This is a multiple answer question. You must choose all that apply to receive full credit. This PEA agar plate was inoculated with an unknown bacteria, and incubated. What do the results tell you about the bacteria?

4x

Question 11 1 / 1 point

This is a multiple answer question! You must choose all the correct answers to get full credit This EMB agar plate was inoculated with an unknown bacteria, and incubated. What do the results tell you about the bacteria? Gram positive Is a probable coliform Gram negative Is a possible coliform

Question 12 1 / 1 point

This is a multiple answer question! You must choose all the answers that are correct to receive full credit. A SIM media tube was inoculated with an unknown bacteria. The following image shows the result after incubation. What does this result tell you about the bacteria? the bacteria produces gelatinase the bacteria is possibly E. coli the bacteria is possibly P. vulgaris the bacteria produces hydrogen sulfide

Question 13 1 / 1 point

a Gram stain

a negative stain

an acid fast stain

an endospore stain

Question 15 1 / 1 point

This is a multiple answer question! You must choose all the answers that are correct to receive full credit. A gelatin tube was inoculated with an unknown bacteria. After incubation, the tube was put on ice for 30 minutes. The following image shows the result. What does this result tell you about the bacteria? the bacteria hydrolyzes gelatin

the bacteria produces gelatinase the bacteria cannot produce gelatinase the bacteria cannot hydrolyze gelatin

Question 16 1 / 1 point

Which of the following bacterial species can produce the structure shown in the following image? Staphylococcus aureus Klebsiella pneumoniae Bacillus cerus Proteus vulgaris

Question 17 1 / 1 point

This is a multiple answer question! You must choose all the correct answers to get full credit

the second streak

the first streak

Question 19 1 / 1 point

This is a multiple answer question! You must choose all the correct answers to get full credit This EMB agar plate was inoculated with an unknown bacteria, and incubated. What do the results tell you about the bacteria? Inhibited by Eosin Y and Methylene blue Not inhibited by Eosin Y and Methylene blue Gram positive

Gram negative Is a non-coliform

Question 20 1 / 1 point

This is a multiple answer question! You must choose all the answers that are correct to receive full credit. A Simmon's citrate agar slant was inoculated with an unknown bacteria. The following image shows the result after incubation. What does this result tell you about the bacteria? the bacteria can utilize citrate as a sole carbon source the bacteria is possibly Staphylococcus epidermidis the bacteria is possibly Bacillus cereus

A Simmon's citrate agar slant was inoculated with an unknown bacteria. The following image shows the result after incubation. What does this result tell you about the bacteria?

the bacteria hydrolyzes starch

the bacteria cannot utilize citrate as a sole carbon source the bacteria does not produce citrate permease the bacteria produces hydrogen sulfide

Question 24 1 / 1 point

This is a multiple answer question! You must choose all the correct answers to get full credit This MAC agar plate was inoculated with an unknown bacteria, and incubated. What do the results tell you about the bacteria?

Gram positive

the bacteria doesn't ferment lactose

the bacteria is inhibited by crystal violet and/or bile salts

Gram negative

Question 25 0 / 1 point

A mannitol broth was inoculated with a unknown bacteria and incubated.

cocci in clusters/singles

rods in clusters/singles

Gram negative

Gram positive

Question 27 1 / 1 point

What is the total magnification of a microscope if the oculars are 10x and the 10x objective is in place?

100x

1000x

150x

400x

Question 28 1 / 1 point

This is a multiple answer question. You must choose all that apply to receive full credit. This sample of unknown bacteria was stained using the Gram stain procedure. What do the results tell you about the bacteria?

rods in chains

Gram negative

Gram positive

rods in clusters

Question 29 1 / 1 point