knowledge check : cells

 Knowledge Check

There are several different types of cellular organelles. The very small structures (fixed to the endoplasmic reticulum or free within the cytoplasm) that consist of RNA and proteins, and function in protein synthesis, are:

Incorrect! Ribosomes are very small structures that consist of RNA and proteins. Some ribosomes are fixed, i.e., bound to the endoplasmic reticulum. Other ribosomes are free and scattered within the cytoplasm. They function in protein synthesis.

Nucleus - Incorrect

Peroxisomes

Lysosomes

Ribosomes - This is the correct answer.

The organelle that produces nearly all (95%) of the energy required by the cell is the:

Correct! Mitochondria are oval organelles bound by a double membrane with inner folds enclosing important metabolic enzymes. They produce nearly all (95%) of the ATP and energy production required by the cell.

Nucleolus

Golgi apparatus

Mitochondria - Correct!

Centioles