Question

Which of the following is not characteristic of a eukaryotic cell?
A. Ribosomes associated with endoplasmic reticulum
B. Dictyosomes associated with golgi bodies
C. Cristae inside of mitochondria
D. Thylakoids inside of chloroplasts

Answer 1

Hint: The word eukaryotic is made up of two words, eu meaning true and karyotic meaning nucleus. Therefore, eukaryotic cells are the cells that have a true nucleus with a nuclear membrane and a nucleolus. Moreover, the DNA of the eukaryotic organisms has histone proteins.

Complete answer: Let us look at all the options given to us one by one.
-Ribosomes associated with endoplasmic reticulum: The ribosomes in a eukaryotic plant cell are found attached on the surface of the endoplasmic reticulum. The ribosomes are associated with the rough endoplasmic reticulum or the RER, as they are found on the surface of the rough endoplasmic reticulum. The ribosomes attach themselves to the surface of the endoplasmic reticulum by its larger unit or the 60S unit.
-Dictyosomes associated with golgi bodies: In eukaryotic plant cells, the golgi body is also known as the dictyosome. Thus, dictyosomes are not associated with golgi bodies but they are the name of golgi bodies in the case of the plant cells.
-Cristae inside of mitochondria: The cristae are the teeth-like projections that are found in the mitochondria of the eukaryotic cells. The cristae are found by the inwards folding of the inner membrane of the mitochondria. They help in increasing the surface area for the oxysomes to attach.
-Thylakoids inside of chloroplasts: The thylakoids are found inside the chloroplasts of the eukaryotic cells. The thylakoids are also known as the grana lamellae. This is because they are a unit of the granum. The thylakoid is a center for photosynthesis. This is because the light reaction occurs in the grana.
Thus, based on the above information, we can conclude that dictyosomes associated with golgi bodies are not characteristic of a eukaryotic cell.
Hence, the correct answer is option (B).

Note: In eukaryotic plant cells the golgi apparatus is known as the dictyosomes. The dictyosomes are the smaller golgi apparatus type vesicles. The proteins that are synthesized by the endoplasmic reticulum are processed and packaged by the golgi apparatus for further storage, transport, and secretion.