Unit 4 Cells

1. What is the term that only some things come in and out and what

cell part has this function?

• Selectively or Semi permeable

• Cell membrane

2. What are the 2 layers made of?

• Bilayer of Phospholipids

3. Does the inside and outside of the cell love or dislike water?

Why?• Loves water/hydrophilic because their

polar heads are facing inside and outside of the cell

4. How does the inside of the cell membrane feel about water?

Why?• Does not like water/hydrophobic because

the non-polar tails facing the inside the cell membrane

5. What are embedded into the cell membrane?

• Protein molecules

6. What is the membrane sometimes referred as because of the free

floating protein molecules? • Fluid Mosaic Model

7. Define cytoplasm.

• Space within the cell

8. What is the function of the nucleus?

• To control all the functions of the cell

9. What are the 3 main parts of the nucleus and what are their

functions?– Nuclear membrane-controls what goes in and

out of the cell– Nucleolus-makes ribosomes– DNA/chromatin-hereditary/genetic information

10. What is the function of the Rough ER?

• Transports proteins

11. What is the function of the smooth ER?

• Make and transport lipids

12. The ribosomes make the proteins, but who tells them how?

• The nucleus gives the directions for making the proteins

13. Where are ribosomes located?

• On the rough ER or freely floating in cytoplasm

14. Golgi apparatus is flattened sacs, what are their 3 jobs?

• Modify proteins

• Package proteins

• Secrete proteins out in vesicles to where they are needed

15. Lysosomes break down wastes using what type of protein?

• enzymes

16. What things do vacuoles store?

• Water, food and some wastes

17. Vacuoles are in both plant and animal cells for storage, what is the main difference between those two

types of cell’s vacuoles?• Plants have one large one that provides

turgor, while animals are small

18. How does Mitochondria/Mitochondrion (plural)

make energy?• Breaking bonds

19. What is another term commonly used to refer to cell energy?

• ATP

20. What substance does mitochondrion use to make

energy?• Glucose AKA sugar

21. What is the mitochondria’s nickname?

• Powerhouse

22. Write the 4 step process for making proteins:

• Production of ribosomes in the nucleolus of the nucleus

• Ribosomes delivered to the rough ER where they make the proteins

• Proteins delivered to Golgi apparatus or Golgi bodies

• Golgi bodies modify, package and deliver the proteins to where they are needed

23. What is the organelle that is only in animal cells and what is its

function?• Centrioles to make spindle fibers for

mitosis

24. What are the two main form of cell movement and briefly describe.• Cilia-short hair-like projections

• Flagella-long whip-like tail

25. What do plant cells look like?

• Brick walls

26. What are the 2 structures only in a plant cell?

• Cell wall

• Chloroplasts

27. What is the rigid outside structure of support and protection

in a plant cell?• Cell wall

28. What captures light in the chloroplast?

• Chlorophyll

29. What does it convert light to?

• Chemical energy

• Chloroplasts make sugar from carbon _______. dioxide

31. Why are cells performing cellular transport? (What are they

trying to achieve?)• Homeostasis/equilibrium

32. What are the 2 main types of cellular transport, their main

differences and which direction do their particles flow ?

• Active transport requires energy because particles flow low concentration to high concentration

#32. cont.

• Passive transport does NOT require energy because particles flow from high concentration to low concentration

33. Define active transport.

• Pumping substances across the membrane using energy

• 34. Active transport moves from _____concentration to _____ using _______.

low high

energy

35. What are the 2 types of Active transport are there and do the substances end up inside or

outside the cell?• Endocytosis-

substance ends up inside the cell

• Exocytosis-substances exit the cell

36. What are the 3 steps of Endocytosis?

• Membrane makes a pocket (a mouth)

• Pocket closes around substance to form a vesicle

• Vesicle fuses with organelles to release contents

37. What is the difference between phagocytosis and pinocytosis?

• Phagocytosis takes in large particles or bacteria cells

• pinocytosis takes in fluids and solutes

38. Compare the steps of Endocytosis and Exocytosis.

• Exocytosis steps are in reverse order

• 39. Diffusion is ______ transport, where molecules move from ____ to low concentration and do NOT require _____.

passive

high

energy

• 40. In the diagram below, draw an arrow for the flow of molecules in diffusion to reach homeostasis.

• Membrane Membrane • X X X X X X X X X X• X X X X• X X X X X X

X• X X X X X X X

X (BEFORE DIFFUSION) (AFTER DIFFUSION)

• 41. Facilitated diffusion uses ________ proteins to move large & polar molecules from high to low concentration. The main difference in facilitated diffusion is that is much ______ (speed) than regular diffusion.

faster

carrier

• 42. Osmosis is another type of diffusion but it involves the movement of water molecules from ____ to ____ percentage of water molecules to solute.

• This is the opposite of the percentage of solute/concentration of the solution ie. 75% solute is 25% water etc.

lowhigh

• 43. H2O goes to areas where there are _____ solutes.more

• 44. Hypotonic solution means there is ____ solutes in the solution than there is in the cell.

less

• 45. When a cell is in a_____________, the water will flow ____ the cell and the cell’s size will_______.

HYPOTONIC SOLUTION

into

increase

• 46. Isotonic solution means there is __________of solutes in the solution as there is in the cell.

the same amount

• 47. When a cell is in an_____________,

the water will flow _______of the cell and the cell’s size will________.

ISOTONIC SOLUTION

in and out

stay the same

• 48. Hypertonic solution means there is ______ solutes in the solution than there is in the cell.

more

• 49. When a cell is in a____________, the water will flow out of the cell and the cell’s size will______.

HYPERTONIC SOLUTION

shrink

50. What is turgor pressure?

• Force a vacuole has against the cell membrane and wall

• 51. When the vacuole is full and pushes the organelles against the cell membrane/wall, it has ____turgor pressure.

high

52. What happens when the there is low turgor pressure?

• The plant will wilt/plasmolysis

53. What causes plasymolysis?

• Low turgor pressure

54. Know cell parts