Question

select the descriptions that apply to the ribosome. □ a cellular structure that is responsible for the synthesis of proteins □ a cellular structure that is composed of both rna and protein □ a membrane-bound organelle that stores digestive enzymes □ a membrane-enclosed organelle involved with cellular respiration □ a membranous network associated with protein production

Explanation:

1. Ribosomes are known as the site of protein synthesis, so "a cellular structure that is responsible for the synthesis of proteins" applies.
2. Ribosomes are composed of ribosomal RNA (rRNA) and proteins, so "a cellular structure that is composed of both RNA and protein" applies.
3. Membrane - bound organelles that store digestive enzymes are lysosomes, not ribosomes, so this does not apply.
4. Membrane - enclosed organelles involved in cellular respiration are mitochondria, not ribosomes, so this does not apply.
5. The membranous network associated with protein production is the rough endoplasmic reticulum (with ribosomes on its surface, but the network itself is the ER), not the ribosome. Ribosomes are not membranous networks.

Answer:

a. a cellular structure that is responsible for the synthesis of proteins
b. a cellular structure that is composed of both RNA and protein