Question

What are membrane bound structure in a cell called ?

Answer 1

they are called cell organelles
like nucleus mitochondria etc
hope this helps

Answer 2

Eukaryotic cells contain many membrane-bound organelles. An organelle is an organized and specialized structure within a living cell. The organelles include the nucleus, ribosomes, endoplasmic reticulum, Golgi apparatus, vacuoles, lysosomes, mitochondria, and, in plants, chloroplasts.