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1 | |
What is the type of cell that defends the human body against infection by engulfing and digesting the invading disease-causing bacteria? |
| | A) | macrophage |
| | B) | defender cell |
| | C) | red blood cell |
| | D) | epithelial cell |
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2 | |
What is the best description of the fact that the cell membrane allows some materials to pass through it, but stops others? |
| | A) | Diffusion causes the movement of the materials through the cell membrane. |
| | B) | Active transport causes the movement of the materials through the cell membrane. |
| | C) | Osmosis stops the movement of some materials across the cell membrane. |
| | D) | The cell membrane is semi-permeable. |
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3 | |
Complete the sentence below. A cell membrane is composed primarily of ________, that are arranged with their ________ heads out and their ________ tails in. |
| | A) | proteins, hydrophobic, hydrophilic |
| | B) | proteins, hydrophilic, hydrophobic |
| | C) | phospholipids, hydrophilic, hydrophobic |
| | D) | phospholipids, hydrophobic, hydrophilic |
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4 | |
What does it mean when a substance is described as "hydrophilic?" |
| | A) | The substance likes "philic." |
| | B) | The substance does not react with water. |
| | C) | The substance does not like water. |
| | D) | The substance likes water. |
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5 | |
Cell membranes also have protein molecules embedding within their structure. Which of the following is NOT a role that these proteins play? |
| | A) | Help to move substances across the cell membrane. |
| | B) | Repair damaged parts of the cell membrane. |
| | C) | Act as markers to help other cells recognize each other. |
| | D) | Act as attachment sites for messenger molecules. |
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6 | |
Which of the following is an example of a man made semi-permeable membrane? |
| | A) | Brita water filters |
| | B) | Ziploc bags |
| | C) | Vinyl Tent Fly |
| | D) | Household glass windows |
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