Fill in the following table regarding the Gram stain:

검증된 단계별 안내

Step 1: Understand the purpose of the Gram stain, which is to differentiate bacteria into Gram-positive and Gram-negative groups based on the structure of their cell walls.

Step 2: Identify the key components of the Gram stain procedure: crystal violet (primary stain), iodine (mordant), alcohol or acetone (decolorizer), and safranin (counterstain).

Step 3: For each step in the table, describe what happens to Gram-positive bacteria: they retain the crystal violet-iodine complex and appear purple because of their thick peptidoglycan layer.

Step 4: For each step, describe what happens to Gram-negative bacteria: they lose the crystal violet-iodine complex during decolorization due to their thinner peptidoglycan layer and outer membrane, and then take up the safranin counterstain, appearing pink/red.

Step 5: Fill in the table by matching each step of the Gram stain with the expected color and structural changes in both Gram-positive and Gram-negative bacteria.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Gram Stain Procedure

The Gram stain is a differential staining technique used to classify bacteria into Gram-positive or Gram-negative based on their cell wall properties. It involves four steps: crystal violet staining, iodine treatment, alcohol decolorization, and counterstaining with safranin. Each step affects how bacteria retain or lose the stain.

Bacterial Cell Wall Structure

The difference in Gram stain results is due to variations in bacterial cell walls. Gram-positive bacteria have a thick peptidoglycan layer that retains the crystal violet-iodine complex, appearing purple. Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane, causing them to lose the initial stain and take up the counterstain, appearing pink.

Interpretation of Gram Stain Results

Understanding how to interpret the colors and morphology after Gram staining is essential. Purple indicates Gram-positive bacteria, while pink indicates Gram-negative. This distinction helps in bacterial identification and guides antibiotic treatment decisions.