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| 1 | |
The plasma membrane is composed primarily of _____. |
| | A) | phospholipids |
| | B) | carbohydrates |
| | C) | waxes |
| | D) | nucleic acids |
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| 2 | |
The tails of the phospholipids are _____. |
| | A) | nonpolar |
| | B) | hydrophobic |
| | C) | directed inwards in the bilayer |
| | D) | all of the above |
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| 3 | |
The amount of phospholipid extracted from red blood cells led researchers to propose that ____. |
| | A) | the phospholipids form a single layer around the cell |
| | B) | the phospholipids form a bilayer around the cell |
| | C) | there are not enough phospholipids to create a membrane around the cell |
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| 4 | |
Electron micrographs support the _____ model of the plasma membrane. |
| | A) | sandwich |
| | B) | unit membrane |
| | C) | fluid-mosaic |
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| 5 | |
According to the fluid-mosaic model, _____ are partially or wholly embedded in a fluid phospholipid bilayer. |
| | A) | nucleic acids |
| | B) | monosaccharides |
| | C) | proteins |
| | D) | triglycerides |
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| 6 | |
All membranes appear the same in electron micrographs. |
| | A) | True |
| | B) | False |
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| 7 | |
The plasma membrane is permeable to some nonlipid substances. |
| | A) | True |
| | B) | False |
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| 8 | |
According to the fluid-mosaic model the hydrophilic heads of the phospholipids face the intra and extracellular fluids. |
| | A) | True |
| | B) | False |
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| 9 | |
Phospholipids are the only type of lipid in the plasma membrane. |
| | A) | True |
| | B) | False |
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| 10 | |
The permeability of most membranes is reduced by the presence of _____ in the membrane. |
| | A) | nucleotides |
| | B) | proteins |
| | C) | cholesterol |
| | D) | glycolipids |
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| 11 | |
A sugar attached to a lipid is called a _____. |
| | A) | glycoplipid |
| | B) | disaccharide |
| | C) | monomer |
| | D) | glycoprotein |
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| 12 | |
The plasma membrane is "sugar-coated" by _____. |
| | A) | glycolipids |
| | B) | gylcoproteins |
| | C) | both A and B |
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| 13 | |
The proper functioning of some of the membrane proteins depends on the fluidity of the membrane. |
| | A) | True |
| | B) | False |
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| 14 | |
Which of the following lipids may be found in the plasma membrane? |
| | A) | phospholipids. |
| | B) | cholesterol. |
| | C) | glycolipids. |
| | D) | all of the above. |
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| 15 | |
The two halves of the plasma membrane are identical. |
| | A) | True |
| | B) | False |
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| 16 | |
The plasma membrane is a stiff and rigid structure. |
| | A) | True |
| | B) | False |
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| 17 | |
Glycolipids and glycoproteins vary from __________. |
| | A) | species to species |
| | B) | individual to individual |
| | C) | cell to cell |
| | D) | all of the above |
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| 18 | |
Particular molecules or ions freely cross the plasma membrane with assistance from _____. |
| | A) | receptor proteins |
| | B) | cell recognition proteins |
| | C) | channel proteins |
| | D) | enzymatic proteins |
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| 19 | |
Transplant rejections are the result of the immune system's response to foreign glycoproteins and glycolipids. |
| | A) | True |
| | B) | False |
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| 20 | |
A person's blood type is determined by the presence of particular _____ in the red blood cells' membranes. |
| | A) | phospholipids |
| | B) | glycoproteins |
| | C) | steroids |
| | D) | nucleic acids |
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| 21 | |
Receptor proteins in the plasma membrane bind to any kind of molecule. |
| | A) | True |
| | B) | False |
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| 22 | |
Peripheral proteins are found within the plasma membrane. |
| | A) | True |
| | B) | False |
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| 23 | |
Lipid-soluble molecules move freely across the plasma membrane. |
| | A) | True |
| | B) | False |
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| 24 | |
Which of the following does NOT move freely (without energy or a carrier protein) across the plasma membrane? |
| | A) | H2O |
| | B) | steroids |
| | C) | Na+ |
| | D) | O2 |
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| 25 | |
Which of the following requires energy? |
| | A) | diffusion |
| | B) | active transport |
| | C) | osmosis |
| | D) | facilitated transport |
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| 26 | |
During diffusion molecules move from areas of low concentration to areas of high concentration. |
| | A) | True |
| | B) | False |
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| 27 | |
The hydrophobic tails of the phospholipids in the plasma membrane are what prevent ions and charged molecules from freely crossing the membrane. |
| | A) | True |
| | B) | False |
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| 28 | |
The sugar you stir into your coffee is an example of a _____. |
| | A) | solvent |
| | B) | solute |
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| 29 | |
Osmosis is specifically about the movement of _____ in and out of cells. |
| | A) | sugars |
| | B) | proteins |
| | C) | water |
| | D) | oxygen |
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| 30 | |
If the inside of a cell is 1% NaCl, which solution is isotonic to the cell? |
| | A) | 0.01% NaCl |
| | B) | 0.1% NaCl |
| | C) | 1% NaCl |
| | D) | 10% NaCl |
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| 31 | |
If the inside of a cell is 1% NaCl, which solution is hypertonic to the cell? |
| | A) | 0.01% NaCl |
| | B) | 0.1 % NaCl |
| | C) | 1% NaCl |
| | D) | 10% NaCl |
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| 32 | |
A hypotonic solution has fewer solutes than the cell. |
| | A) | True |
| | B) | False |
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| 33 | |
Fluids and dissolved substances are transported into the cell by __________. |
| | A) | exocytosis |
| | B) | osmosis |
| | C) | diffusion |
| | D) | pinocytosis |
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| 34 | |
Solutions that cause cells to neither gain nor lose water are known as ______ solutions. |
| | A) | isotonic |
| | B) | hypertonic |
| | C) | hypotonic |
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| 35 | |
When a plant cell is placed in a hypotonic solution which of the following will occur? |
| | A) | The cell will swell and burst. |
| | B) | nothing |
| | C) | The central vacuole gains water. |
| | D) | The cell will shrink or shrivel up. |
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| 36 | |
The term hemolysis refers to ______. |
| | A) | normal red blood cells |
| | B) | red blood cells that burst after being placed in a hypotonic solution |
| | C) | shrinking of the cytoplasm after a cell is placed in a hypertonic solution |
| | D) | the loss of turgor pressure in a plant cell |
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| 37 | |
Carrier proteins are required for _____. |
| | A) | osmosis |
| | B) | facilitated transport |
| | C) | active transport |
| | D) | both B and C |
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| 38 | |
Osmotic pressure affects _____. |
| | A) | water retention by the kidneys |
| | B) | water uptake from tissue fluids by the capillaries |
| | C) | water absorption from the large intestine |
| | D) | all of the above |
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| 39 | |
Which of the following correctly describes facilitated transport? |
| | A) | It requires the expenditure of energy. |
| | B) | Molecules move from high concentration to low concentration. |
| | C) | Vacuoles form to move materials. |
| | D) | all of the above |
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| 40 | |
Which of the following correctly describes active transport? |
| | A) | carrier proteins are needed. |
| | B) | it requires the expenditure of energy. |
| | C) | molecules move from areas of low concentration to areas of high concentration. |
| | D) | all of the above. |
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| 41 | |
Insulin leaves insulin-secreting cells by _____. |
| | A) | phagocytosis |
| | B) | receptor-mediated endocytosis |
| | C) | osmosis |
| | D) | exocytosis |
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| 42 | |
Macrophages, immune system cells, engulf bacteria by _____. |
| | A) | exocytosis |
| | B) | facilitated transport |
| | C) | phagocytosis |
| | D) | osmosis |
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| 43 | |
Specific molecules enter cells by _____. |
| | A) | phagocytosis |
| | B) | receptor mediated endocytosis |
| | C) | diffusion |
| | D) | osmosis |
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| 44 | |
The peptide hormone, follicle stimulating hormone, would activate its specific target cells by _____. |
| | A) | diffusing into the cells |
| | B) | binding a receptor protein in the plasma membranes |
| | C) | phagocytosis |
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| 45 | |
Bacteria, fungi and plants all have an extracellular component called a cell wall. |
| | A) | True |
| | B) | False |
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| 46 | |
Woody plants are characterized by _____. |
| | A) | a secondary cell wall |
| | B) | the absence of a cell wall |
| | C) | numerous desmosomes |
| | D) | collagen |
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| 47 | |
The extracellular matrix of animal cells supports them and fills the spaces between the cells. |
| | A) | True |
| | B) | False |
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| 48 | |
Plant cells are able to exchange materials through _____. |
| | A) | gap junctions |
| | B) | plasmodesmata |
| | C) | tight junctions |
| | D) | desmosomes |
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| 49 | |
People may get injections of _____, a component of the extracellular matrix of animal cells, to get rid of their wrinkles. |
| | A) | collagen |
| | B) | cholesterol |
| | C) | cellolose |
| | D) | chromatin |
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| 50 | |
Organs with tissues that get stretched a lot like the heart and bladder are characterized by _____. |
| | A) | tight junctions |
| | B) | adhesion junctions |
| | C) | plasmodesmata |
| | D) | gap junctions |
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| 51 | |
Tight junctions between cells make tissues leakproof. |
| | A) | True |
| | B) | False |
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| 52 | |
Heart cells are able to contract in unison because of the flow of ions through _____. |
| | A) | gap junctions |
| | B) | tight junctions |
| | C) | plasmodesmata |
| | D) | adhesion junctions |
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| 53 | |
All cells have a _____. |
| | A) | cell wall |
| | B) | plasma membrane |
| | C) | nucleus |
| | D) | flagellum |
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| 54 | |
The plasma membrane allows anything to move freely in or out of the cell. |
| | A) | True |
| | B) | False |
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