1. Chapter 6
A Tour of the Cell

2. In which cell would you expect to find the most tight junctions?
In which cell would you expect to find the most tight junctions?
Muscle cell in the thigh muscle of a long-distance runner
Pancreatic cell that manufactures digestive enzymes
Macrophage (white blood cell) that engulfs bacteria
Epithelial cells lining the digestive tract
Ovarian cell that produces estrogen (a steroid hormone)
Answer: d
Source: Taylor - Student Study Guide for Biology, Sixth Edition, Test Your Knowledge Question #16

3. In which cell would you expect to find the most lysosomes?
Muscle cell in the thigh muscle of a long-distance runner
Pancreatic cell that manufactures digestive enzymes
Macrophage (white blood cell) that engulfs bacteria
Epithelial cells lining the digestive tract
Ovarian cell that produces estrogen (a steroid hormone)
Answer: c
Source: Taylor - Student Study Guide for Biology, Sixth Edition, Test Your Knowledge Question #17

4. In which cell would you expect to find the most smooth endoplasmic reticulum?
Muscle cell in the thigh muscle of a long-distance runner
Pancreatic cell that manufactures digestive enzymes
Macrophage (white blood cell) that engulfs bacteria
Epithelial cells lining the digestive tract
Ovarian cell that produces estrogen (a steroid hormone)
Answer: e
Source: Taylor - Student Study Guide for Biology, Sixth Edition, Test Your Knowledge Question #18

5. In which cell would you expect to find the most bound ribosomes?
Muscle cell in the thigh muscle of a long-distance runner
Pancreatic cell that manufactures digestive enzymes
Macrophage (white blood cell) that engulfs bacteria
Epithelial cells lining the digestive tract
Ovarian cell that produces estrogen (a steroid hormone)
Answer: b
Source: Taylor - Student Study Guide for Biology, Sixth Edition, Test Your Knowledge Question #19

6. In which cell would you expect to find the most mitochondria?
Muscle cell in the thigh muscle of a long-distance runner
Pancreatic cell that manufactures digestive enzymes
Macrophage (white blood cell) that engulfs bacteria
Epithelial cells lining the digestive tract
Ovarian cell that produces estrogen (a steroid hormone)
Answer: a
Source: Taylor - Student Study Guide for Biology, Sixth Edition, Test Your Knowledge Question #20

7. Of the following, which is probably the most common route for membrane flow in the endomembrane system?
Golgi → lysosome → ER → plasma membrane
tonoplast → plasma membrane → nuclear envelope → smooth ER
nuclear envelope → lysosome → Golgi → plasma membrane
rough ER → vesicles → Golgi → plasma membrane
ER → chloroplasts → mitochondrion → cell membrane
Answer: d
Source: Barstow - Test Bank for Biology, Sixth Edition, Question #20

8. Cells of the pancreas will incorporate radioactively labeled amino acids into proteins. This “tagging” of newly synthesized proteins enables a researcher to track the location of these proteins in a cell. In this case, we are tracking an enzyme that is eventually secreted by pancreatic cells. Which of the following is the most likely pathway for movement of this protein in the cell? *
ER → Golgi → nucleus
Golgi → ER → lysosome
nucleus → ER → Golgi
ER → Golgi → vesicles that fuse with plasma membrane
ER → lysosomes → vesicles that fuse with plasma membrane
Answer: d
Source: Campbell/Reece - Biology, Sixth Edition, EOC Self-Quiz Question #4
Discussion Notes for the Instructor
There are several questions which can be asked to guide the discussion of this question including:
Where are these proteins going to be made? (remember that they are going to be exported from the cell)
How are they going to get from where they are produced to outside the cell?
Using these questions as an outline, discussion of the choices might look like this:
Choice A, going to the nucleus is not going to get these proteins outside the cell
Choice B, proteins are not produced in the Golgi, but rather the rough ER
Choice C, similar to Choice B
Choice D, correct
Choice E, lysosomes contain hydrolytic enzymes. These enzymes would break the bonds between the amino acids and destroy the protein molecules.

9. Which type of cell would probably provide the best opportunity to study lysosomes?
muscle cell
nerve cell
phagocytic white blood cell
leaf cell of a plant
bacterial cell
Answer: c
Source: Campbell/Reece - Biology, Sixth Edition, EOC Self-Quiz Question #7