Chapter 3: Cells

1. Chapter 3: Cells Clicker Questions by Kristen Curran, University of Wisconsin-Whitewater

2. Which feature below is only found in eukaryotic cells? Ribosomes DNA Cell membrane Mitochondria

3. Which evidence below supports the theory that mitochondria and chloroplasts were originally bacteria? Circular DNA is present in both organelles. Both organelles are larger than other organelles in the cell. Both organelles are surrounded by a single lipid bilayer. All of the above.

4. Lipids that make up the cell membrane are hydrophobic. Hydrophilic molecules, like glucose, cannot cross this barrier. What major component of the plasma membrane helps glucose get into and out of the cell? Phospholipids Carbohydrates Nucleic acids Proteins Fatty acids

5. Classroom Catalyst Membrane Fluidity and Cholesterol

6. Given the composition of the fictitious membranes below, which membrane is the most fluid? 50% saturated fatty acids and 50% unsaturated fatty acids 70% saturated fatty acid and 30% unsaturated fatty acid 30% saturated fatty acid and 70% unsaturated fatty acid 80% saturated fatty acid and 20% unsaturated fatty acid

7. Smallmouth Bass and Yellow Perch are considered warm water fish, whereas certain species of char are found in the arctic. Which fish do you think might have the most cholesterol in the membranes of its cells? Smallmouth Bass Yellow Perch Arctic char Both 1 and 2 are correct.

8. Which of the cell membrane functions below is possible due to the presence of proteins in the plasma membrane? The cell membrane determines what molecules will enter or leave the cell. The cell membrane contains proteins that can bind to messages sent from other cells and relay the message to the interior of the cell. The cell membrane contains proteins that act as a fingerprint for distinguishing between self and foreign cells. Both 1 and 2 are correct. All of the above.

9. An amoeba (a single-celled protist) is placed in a solution. The volume of the cell increases (cell swells). Which statement below is the correct interpretation of this result? The amoeba is in a hypertonic solution. Water is moving into the amoeba. The amoeba is in a isotonic solution. Water is moving out of the amoeba.

10. Classroom Catalyst Passive vs. active transport

11. A normal cell has a high concentration of potassium on the inside and a low concentration of potassium on the outside. Also, a normal cell has a low concentration of sodium on the inside and a high concentration on the outside. Yet, the net movement of potassium is into the cell and the net movement of sodium is out of the cell. What type of transport is involved? Osmosis Facilitated transport Active transport Simple diffusion Secondary active transport

12. An intestinal epithelial cell powers the movement of glucose into the cell against its concentration gradient by simultaneously transporting sodium down its concentration gradient. Which transport mechanism is responsible? Osmosis Facilitated transport Active transport Simple diffusion Secondary active transport

13. When a woman nurses her baby, proteins are released from the mammary cells, accumulate in the ducts of the breast, and flow out of the nipple. Which process listed below is involved? Phagocytosis Pinocytosis Receptor-mediated endocytosis Exocytosis

14. Your skin is water proof. What type of cell-cell junction is most likely involved in creating a water-tight barrier between the outside and inside of your body? Tight junctions Desmosomes Gap junctions

15. Which cellular component would be responsible for the classic shape of a red blood cell? Nucleus Cytoskeleton Lysosome Mitochondria

16. Which cells below would have the most smooth endoplasmic reticulum? Kidney cells Kidney cells of an alcoholic Liver cells Liver cells of an alcoholic

17. You can think of a cell as a car factory. The control center holds the directions for making the car. There are assembly lines for constructing the engine and frame of the car. After the main structure of the car is built, the finishing touches are added (paint, leather seats, chrome bumpers). Lastly, the car is shipped to different car destinations. Which organelle would be responsible for putting the finishing touches on the car (protein)? Nucleus Ribosome Rough endoplasmic reticulum Smooth endoplasmic reticulum Golgi Apparatus

18. Which answer below is not found in a eukaryotic cell? Cell wall DNA without membrane Endoplasmic reticulum Chloroplast Lysosome