Apentix/AP Biology/Unit 2: Cell Structure and Function/Question

AP Biologyeasymcq1 pt

Which function do free ribosomes in the cytosol share with ribosomes bound to the rough ER?

A.Attaching carbohydrate side chains to finished proteins

B.Synthesizing polypeptide chains from instructions carried by mRNA

C.Generating ATP by chemiosmosis across internal membranes

D.Digesting damaged organelles with acid hydrolases

Explanation

Core Concept

Free cytosolic ribosomes and ribosomes temporarily bound to the rough ER use the same basic translation machinery to build polypeptides from mRNA. Whether a cytosolic ribosome becomes ER-bound depends on targeting information in the protein being synthesized. Many cytosolic, nuclear, and organelle-targeted proteins are made on free ribosomes, whereas secreted and endomembrane proteins are commonly synthesized through the rough ER.

Correct Answer

BSynthesizing polypeptide chains from instructions carried by mRNA

More Unit 2: Cell Structure and Function practice questions

Try a random question →

Practice more AP Biology questions with full explanations

Practice Unit 2: Cell Structure and Function Questions →