Download CHAPTER 7 HOMEOSTASIS AND TRANSPORT Worksheet 1. A

CHAPTER 7
HOMEOSTASIS AND TRANSPORT
Worksheet
1. A type of transport in which water moves across and down its concentration gradient is called
______________________________________.
2. Net movement of water across a cell membrane occurs from a ___________________ solution to a
________________________ solution.
3. A _____________________ ___________________ only allows certain molecules to pass thorough.
4. A __________________________ _____________________ is the concentration difference across space.
5. A structure that can move excess water out of a unicellular organism is a __________________________
______________________.
6. The movement of some substances, without any input of energy by the cell, is called ________________________
________________________.
7. The process of diffusion requires________________________________________________
___________________________________________________________________________.
8. If the molecular concentration of a substance is the same throughout space, the substance is in
____________________________________.
9. All forms of passive transport depend on the ___________________ ________________ of molecules.
10. The movement of molecules from an area of higher concentration to an area of lower concentration is called
______________________________.
11. Sodium-potassium pumps move ___________________ ions _______________ of the cell and
___________________________ ions ___________________ the cell. This causes the inside of the cell to have what
type of charge? __________________________.
12. Most of the time, the environment that plant cells live in is ________________________.
13. Plasmolysis of a human red blood cell would occur if the cell were in a(n) ____________________________
____________________________.
14. The bursting of cells is called _____________________________.
15. The pressure that water molecules exert against a cell wall is called ___________________
_________________________________.
16. A membrane bound organelle used in endocytosis is called a _______________________.
17. A relatively high solute concentration is called _____________________________.
18. The uptake of large particles is called ________________________________.
19. The shrinking of cells is called _____________________________________.
20. A relatively low solute concentration is called ___________________________.
21. The uptake of solutes or fluids is called ________________________________.
22. Molecules always diffuse ___________________ their concentration gradient.
23. The diffusion of water across a membrane is called __________________________.
24. In an ________________________ _____________________ the concentration of solutes outside and inside the
cell are equal.
25. Transport that requires the cell to expend energy is called _____________________
________________________________.
26. Which type of molecule forms a bilayer within a cell membrane? __________________________________
27. Most food and wastes materials that move into and out of a cell go through ____________________________
________________________________.
28. Glucose molecules cross the cell membrane by means of ______________________________
_______________________________.
29. Ridding the cell of material by discharging it from sacs (vessicles) at the cell surface is called
____________________________________________________.
30. Molecules that are too large to be moved across a cell membrane can be removed from the cell by
________________________________________________.
31. A substance that dissolves in another substance is called a (n) _________________________________________.
32. The diffusion of ___________________________ through the cell membranes is called osmosis.
33. When water enters the cell, it creates pressure. This pressure is called _____________________________
_______________________________________________.
34. A cell does not expend __________________________ when diffusion takes place.
35. __________________________ is the most common solvent in cells.
36. A cell membrane is said to be _______________________________________ permeable because it allows the
passage of some solutes and not others.
37. Facilitated diffusion and active transport are two types of ________________________________ transport.
38. __________________________ _______________________________ allows a cell to stockpile substances in far
greater concentrations that they occur outside the cell.
39. Active transport systems are a form of cell transport that requires energy from molecules of
__________________________________________________.
40. The process in which an amoeba engulfs its prey and takes it in is known as
_______________________________________________________________.