🧪 Answer Reveal: True or False · Microbiology with Dede!

🧪 Answer Reveal: True or False

Question:

Gram-positive bacteria retain the crystal violet stain because of their thick peptidoglycan cell wall.

✅ Correct Answer:

A) True

🧠 Explanation:

Gram-positive bacteria have a thick peptidoglycan cell wall, which allows them to:

• Trap the crystal violet–iodine complex

• Resist decolorization during the alcohol step

• Appear purple under the microscope

🔬 Why this matters:

The Gram stain works based on cell wall structure 👇

• Gram-positive → thick peptidoglycan → purple 💜

• Gram-negative → thin peptidoglycan + outer membrane → pink/red 💗

💡 Quick Recall Tip:

💜 Thick wall = holds stain = Gram-positive

💗 Thin wall = loses stain = Gram-negative

👇 Did you get it right?

Drop a 💜 if you did!

0 comments

skool.com/microbiology-with-dede-5731

Learn microbiology the easy way. Structured notes, quizzes, and support to help you prepare for the ASCP (M) exam and other lab certifications.

Bring people together around your passion and get paid.