Which of the following accurately describes the rough endoplasmic reticulum and the smooth endoplasmic reticulum?...
BIOLOGY
SAT 2021
Which of the following accurately describes the rough endoplasmic reticulum and the smooth endoplasmic reticulum?
- A. The smooth endoplasmic reticulum has many ribosomes bound to its surface, but the rough endoplasmic reticulum does not.
- B. The rough endoplasmic reticulum has many ribosomes bound to its surface, but the smooth endoplasmic reticulum does not.
- C. Neither the rough endoplasmic reticulum nor the smooth endoplasmic reticulum have any ribosomes bound to their surfaces.
- D. The rough endoplasmic reticulum and the smooth endoplasmic reticulum both have many ribosomes bound to their surfaces.
Correct Answer: B. The rough endoplasmic reticulum has many ribosomes bound to its surface, but the smooth endoplasmic reticulum does not.
Explanation
The rough endoplasmic reticulum is described as rough because it is covered in ribosomes, which look like tiny beads along its surface. The smooth endoplasmic reticulum doesn't have these ribosomes all over its surface, so it appears flat and is described as smooth for this reason. The ribosomes function to make proteins.
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