Chapter 6 A Tour of the Cell

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

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

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

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

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

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

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.

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