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MCAT Biology Question — Organelles

Which two organelles appear most similar when viewed under the electron microscope?


A. nucleus and lysosome

B. smooth ER and golgi apparatus

C. mitochondrion and plasma membrane

D. peroxisome and nucleus

Click for Explanation

Both the Golgi and smooth ER appear as membranes with many folds.

A) nucleus and lysosome, incorrect, The nucleus will be much larger than a lysosome.

B) smooth ER and Golgi apparatus, correct.

C) mitochondrion and plasma membrane, incorrect, The mitochondrion will have both an inner and outer membrane and a matrix while the plasma membrane consists of a phospholipid bilayer.

D) peroxisome and nucleus, incorrect, The peroxisome is much smaller than the nucleus and the nucleus is bounded by the nuclear envelope.

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