Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 3 - Assess: 12

Answer

A. Proteins; Phospholipids

Work Step by Step

The rough endoplasmic reticulum (ER) is studded with ribosomes on the side that faces the cytoplasm. This is where proteins are synthesized before entering the ER interior. The smooth ER does not contain any attached ribosomes and is responsible for synthesizing phospholipids.
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