Test: Cell Organization - Grade 9 MCQ

Mycoplasma is wall-less smallest living organism.

1. Chloroplast and mitochondria are the only two organelles that contain their own genetic material.
2. Besides containing genetic material they also contain 70S type ribosome, own enzymes and some amount of RNA as well.
3. They can also undergo fission themselves and thus can multiply themselves.
4. This is why these two organelles are called semi-autonomous organelles.

In science, ATP stands for adenosine triphosphate. This chemical, discovered in the 1920s , is important to life.it stores and releases energy for many cellular process.

The Golgi apparatus links carbohydrates with proteins coming from ER to form glycoproteins. This process is called glycosylation. Golgi complex brings about membrane transformation, that is, converting one type of membrane (e.g., that of ER) into other types (e.g., selectively permeable plasma membrane, differentiated membrane of lysosome). This complex also takes part in the recycling of plasma membrane. The Golgi complex modifies, sorts and packages proteins and lipids coming from the ER. Packaging involves wrapping the material by a membrane, forming secretory vesicles. The secretory vesicles pinch off from the ends of the cisternae and appear as dense secretory or zymogen granules in the cytoplasm. Later, these vesicles release their secretions by exocytosis or revere pinocytosis.

Site of protein synthesis is ribosomes.

So, the correct answer is 'Ribosomes'.