Cells: The living units - Cytoplasmic organelles

10 important questions on Cells: The living units - Cytoplasmic organelles

What is the function of free ribosomes?

Float freely in the cytosol. They make soluble proteins that function in the cytosol, as well as those imported into mitochondria and other organelles

What is the function of membrane bound ribosomes?

They synthesize proteins destined either for incorporation into cell membranes or lysosomes, or for export from the cell

What are the functions of the RER?

- Well developed in most secretory cells
- Membrane factory
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What are the functions of the SER?

Metabolize lipids, synthesize cholesterol, steroid hormones, detoxify drugs, break down stored glucagon, store calcium ions

What is the function of peroxisomes?

Neutralize free radicals, especially in liver and kidney

What is the function of the lysosome?

Digesting particles by endocytosis, degrading stressed/dead cells, metabolic functions (glycogen breakdown), breaking down bone to release calcium in the blood

What is the function of the centrosome?

Acts as microtubule organizing centre

What is the function of a microtubules?

Support the cell and give it shape. Involved in intra- and extracellular movements. Form centrioles, cilia and flagella, if present

What is the function of intermediate filaments?

The stable cytoskeletal elements; resist mechanical forces acting on the cell

What is chromatin composed of?

30% DNA
60% histone proteins
10% RNA

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