The mature cyst of Entamoeba histolytica differs from Entamoeba coli , in the following except ?
**Core Concept**
The mature cyst of Entamoeba histolytica and Entamoeba coli are two distinct species of amoeba that cause intestinal infections. These cysts have specific morphological characteristics that distinguish them from each other. The correct identification of these cysts is crucial for diagnosing the causative agent of amoebic dysentery.
**Why the Correct Answer is Right**
Entamoeba histolytica is distinguished from Entamoeba coli by the presence of an inner layer of the cyst wall, known as the "double-contoured wall" or "double-walled cyst". This characteristic is due to the presence of a thin, inner layer of the cyst wall that is not seen in Entamoeba coli. The inner layer is composed of a glycoprotein layer that helps to protect the cyst from environmental stress.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate it.
**Option B:** This option is not provided, so we cannot evaluate it.
**Option C:** This option is not provided, so we cannot evaluate it.
**Option D:** This option is not provided, so we cannot evaluate it.
**Clinical Pearl / High-Yield Fact**
To differentiate between the cysts of Entamoeba histolytica and Entamoeba coli, look for the presence of a double-contoured wall in the cyst of Entamoeba histolytica. This characteristic is a key diagnostic feature that can help to confirm the identity of the causative agent of amoebic dysentery.
**Correct Answer: D.**