[ 273 ] Life Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • The pattern of muscle as the subject of each sentence also provides a clue as to the subject of the entire passage. What do you think is the main purpose of this passage? What is the shape of a muscle cell? A. sphere B. cylinder C. disc D. cube Which is a difference between a muscle cell and another type of cell? A. Only muscle cells have mitochondria. B. The plasma membrane separates the inside from the outside of the muscle cell. C. Muscle cells have more than one nucleus. D. Muscle cells do not have endoplasmic reticulum.