Question

1. define membrane - bound: a. of the parts of the cell we have discussed, which are considered membrane - bound organelles? b. of the parts of the cell we have discussed, which are not considered membrane - bound organelles?

Explanation:

a. Membrane - bound organelles have a surrounding membrane that separates their contents from the cytoplasm. Examples include the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and peroxisomes. Non - membrane - bound organelles lack this surrounding membrane. Examples are ribosomes, centrosomes, and the cytoskeleton.
b. Non - membrane - bound organelles like ribosomes (which synthesize proteins), centrosomes (involved in cell division in animal cells), and the cytoskeleton (providing structural support and enabling cell movement) are not considered membrane - bound.

Answer:

a. Organelles with a surrounding membrane such as nucleus, mitochondria are membrane - bound.
b. Ribosomes, centrosomes, cytoskeleton are not membrane - bound.