Question

question 1 (1 point) ✓ saved
msds stand for material safety data sheet
true
false
question 2 (1 point) ✓ saved
all chemicals used in a microbiology lab can be safely disposed of down the regular sink drain
true
false
question 3 (1 point) ✓ saved
universal precautions mandates the use of gown or lab, jacket and gloves, at a minimum
true
false
question 4 (1 point) ✓ saved
the gram stain is a complex stain because it uses two different dyes to highlight two different types of compounds.
true
false
question 5 (1 point) ✓ saved
the highest power of a typical lab microscope using the oil immersion lens is 1000x
true
false

Explanation:

• Question 1: MSDS is a well - known abbreviation for Material Safety Data Sheet.
• Question 2: Many chemicals used in a microbiology lab are hazardous (e.g., strong acids, bases, or toxic substances) and cannot be safely disposed of down the regular sink drain.
• Question 3: Universal Precautions do mandate the use of protective gear like a gown or lab jacket and gloves as a minimum requirement to prevent exposure to potentially infectious materials.
• Question 4: The Gram Stain uses crystal violet (a primary stain) and safranin (a counter - stain). Crystal violet binds to peptidoglycan in Gram - positive bacteria, and after decolorization, Gram - negative bacteria take up the safranin.
• Question 5: A typical lab microscope with an oil immersion lens (usually 100x objective lens) combined with a 10x ocular lens gives a total magnification of \(10\times100 = 1000x\).

Answer:

1. True
2. False
3. True
4. True
5. True