Membrane Structure and Function ch5
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| The plasma membrane is composed primarily of _____ | ||
| The tails of the phospholipids are _____ | ||
| Electron micrographs support the _____ model of the plasma membrane | ||
| The amount of phospholipid extracted from red blood cells led researchers to propose that ____ | ||
| According to the fluid-mosaic model, _____ are partially or wholly embedded in a fluid phospholipid bilayer. | ||
| All membranes do not appear the same in electron micrographs (true or false) | ||
| The plasma membrane is permeable to some nonlipid substances. (true or false) | ||
| According to the fluid-mosaic model the hydrophilic heads of the phospholipids face the intra and extracellular fluids.(true or false) | ||
| What is another type of lipid besides phospholipids that are in the plasma membrane. | ||
| The permeability of most membranes is reduced by the presence of _____ in the membrane. | ||
| A sugar attached to a lipid is called a _____. | ||
| The plasma membrane is "sugar-coated" by _____. | ||
| The proper functioning of some of the membrane proteins depends on the fluidity of the membrane. (true or false) | ||
| Which lipids may be found in the plasma membrane? | ||
| The two halves of the plasma ________are not identical. | ||
| The plasma membrane is a stiff and rigid structure. (True or false) | ||
| Glycolipids and glycoproteins vary from __________. | ||
| Particular molecules or ions freely cross the plasma membrane with assistance from _____. | ||
| Transplant rejections are the result of the immune system's response to foreign__________________ | ||
| A person's blood type is determined by the presence of particular _____ in the red blood cells' membranes | ||
| Receptor proteins in the plasma membrane do not bind to any kind of _________ | ||
| What kind of protein is found on the inside surface of the plasma membrane ? | ||
| Lipid-soluble molecules move freely across the plasma membrane. (true or false) | ||
| What does NOT move freely (without energy or a carrier protein) across the plasma membrane? | ||
| What kind of transport requires energy? | ||
| During diffusion molecules move from areas of low concentration to areas of high concentration. (true or false) | ||
| The hydrophobic tails of the phospholipids in the plasma membrane are what prevent ions and charged molecules from freely crossing the membrane.(true or false) | ||
| The sugar you stir into your coffee is an example of a _____. | ||
| Osmosis is specifically about the movement of _____ in and out of cells. | ||
| If the inside of a cell is 1% NaCl, which solution is isotonic to the cell? | ||
| If the inside of a cell is 1% NaCl, which solution is hypertonic to the cell? | ||
| A_______solution has fewer solutes than the cell. | ||
| Fluids and dissolved substances are transported into the cell by __________. | ||
| Solutions that cause cells to neither gain nor lose water are known as ______ solutions. | ||
| When a plant cell is placed in a hypotonic solution what will occur? | ||
| The term hemolysis refers to ______. | ||
| Carrier proteins are required for _____. | ||
| What affects water retention by the kidneys, water uptake from tissue fluids by the capillaries, and water absorption from the large intestine? | ||
| What correctly describes facilitated transport? | ||
| Which of the following correctly describes active transport? | ||
| Insulin leaves insulin-secreting cells by _____. | ||
| Macrophages, immune system cells, engulf bacteria by _____. | ||
| Specific molecules enter cells by _____. | ||
| The peptide hormone, follicle stimulating hormone, would activate its specific target cells by _____. | ||
| Bacteria, fungi and plants all have an extracellular component called a cell wall. (true or false) | ||
| Woody plants are characterized by _____. | ||
| The extracellular matrix of animal cells supports them and fills the spaces between the cells.(true or false) | ||
| Plant cells are able to exchange materials through _____. | ||
| People may get injections of _____, a component of the extracellular matrix of animal cells, to get rid of their wrinkles. | ||
| Organs with tissues that get stretched a lot like the heart and bladder are characterized by _____. | ||
| Tight junctions between cells make tissues leakproof. (true or false) | ||
| Heart cells are able to contract in unison because of the flow of ions through _____. | ||
| All cells have a _____. | ||
| The plasma membrane allows anything to move freely in or out of the cell. (true or false) |