Micro 3401 Lab Exam 1 TTU Questions
& Answers (Grade A+)
What are some ways that microorganisms are important in the
environment? -
correct answer ✅1. Can cause diseases in plants & animals
2. Can be used to produce antibiotics
3. Can be used to produce a wide variety of food products
4. Can be used in industry
5. Are important in nutrient cycling
What does ubiquitous mean and why do you think bacteria are
ubiquitous? -
correct answer ✅Ubiquitous means they occur everywhere. They
are all around us. Bacteria are ubiquitous because they are the
most successful life forms on Earth. They can survive different
temperatures, environments, pH, and conditions
What do these abbreviations (PDA, BHI, and TSA) stand for? -
correct answer ✅PDA: Potato Dextrose Agar, general fungal media
BHI: Brain-Heart Infusion, general Bacterial media
TSA: Tryptic Soy Agar, general bacterial media
Which plates are incubated upside down vs. right-side up? -
correct answer ✅TSA: upside down
,Micro 3401 Lab Exam 1 TTU Questions
& Answers (Grade A+)
PDA: right-side up
BHI: upside down
Put perdí dishes upside down because condensation will drip into
Agar and contaminate the culture
Why do we use microscopes? -
correct answer ✅To see microorganisms that are too small to be
seen with the naked eye
Objectives -
correct answer ✅The lenses closest to the specimen on the
microscope slide
Nosepiece -
correct answer ✅The revolving platform that the three objectives
are on
Objectives from lowest to highest -
correct answer ✅10x objective (low-power objective), 40x (high-
dry), and the 100x (oil immersion)
, Micro 3401 Lab Exam 1 TTU Questions
& Answers (Grade A+)
Parfocal -
correct answer ✅One the low-power objective has been focused
sharply on the specimen, the high-dry and oil immersion objectives
will also be approximately in focus after they are rotated in place
Shifting to an objective with higher magnification decreases the
_____, and a specimen at the edge of the field will no longer be
visible -
correct answer ✅Field of view
condenser -
correct answer ✅Condensed light rays into a cone, thereby
controlling the intensity of illumination
Mention the top 3 important parts of the microscope -
correct answer ✅Nosepiece: revolving platform
Objective lens
Eyepiece: lens closest to your eyes
THEYRE ALL IMPORTANT
& Answers (Grade A+)
What are some ways that microorganisms are important in the
environment? -
correct answer ✅1. Can cause diseases in plants & animals
2. Can be used to produce antibiotics
3. Can be used to produce a wide variety of food products
4. Can be used in industry
5. Are important in nutrient cycling
What does ubiquitous mean and why do you think bacteria are
ubiquitous? -
correct answer ✅Ubiquitous means they occur everywhere. They
are all around us. Bacteria are ubiquitous because they are the
most successful life forms on Earth. They can survive different
temperatures, environments, pH, and conditions
What do these abbreviations (PDA, BHI, and TSA) stand for? -
correct answer ✅PDA: Potato Dextrose Agar, general fungal media
BHI: Brain-Heart Infusion, general Bacterial media
TSA: Tryptic Soy Agar, general bacterial media
Which plates are incubated upside down vs. right-side up? -
correct answer ✅TSA: upside down
,Micro 3401 Lab Exam 1 TTU Questions
& Answers (Grade A+)
PDA: right-side up
BHI: upside down
Put perdí dishes upside down because condensation will drip into
Agar and contaminate the culture
Why do we use microscopes? -
correct answer ✅To see microorganisms that are too small to be
seen with the naked eye
Objectives -
correct answer ✅The lenses closest to the specimen on the
microscope slide
Nosepiece -
correct answer ✅The revolving platform that the three objectives
are on
Objectives from lowest to highest -
correct answer ✅10x objective (low-power objective), 40x (high-
dry), and the 100x (oil immersion)
, Micro 3401 Lab Exam 1 TTU Questions
& Answers (Grade A+)
Parfocal -
correct answer ✅One the low-power objective has been focused
sharply on the specimen, the high-dry and oil immersion objectives
will also be approximately in focus after they are rotated in place
Shifting to an objective with higher magnification decreases the
_____, and a specimen at the edge of the field will no longer be
visible -
correct answer ✅Field of view
condenser -
correct answer ✅Condensed light rays into a cone, thereby
controlling the intensity of illumination
Mention the top 3 important parts of the microscope -
correct answer ✅Nosepiece: revolving platform
Objective lens
Eyepiece: lens closest to your eyes
THEYRE ALL IMPORTANT
