Question

multiple choice 1 point which of the following cellular structures is not a membrane - bound organelle? lysosome, which contains hydrolytic enzymes for intracellular digestion. nucleus, which houses the cells genetic material. ribosome, which is the site of protein synthesis. endoplasmic reticulum, which is involved in protein and lipid synthesis. mitochondrion, which is the site of cellular respiration.

Explanation:

Ribosomes are non - membrane bound organelles responsible for protein synthesis. Lysosomes, mitochondria, endoplasmic reticulum, and nucleus are all membrane - bound organelles. Lysosomes have hydrolytic enzymes, mitochondria are for cellular respiration, endoplasmic reticulum is involved in protein and lipid synthesis, and nucleus houses genetic material.

Answer:

Ribosome, which is the site of protein synthesis.