Lecture 3 - ANAT - Cells II

Question 1

how much mass does lipids make up in membrane

Answer 1

50%

Question 2

function of proteins in cell membrane

Answer 2

communication and transport

Question 3

function of cholestorol in cell membrane

Answer 3

rigidity

Question 4

function of phospholipids in cell membrane

Answer 4

separate internal/external environments

Question 5

function of carbohydrates in cell membrane

Answer 5

recognition

Question 6

thickness of plasma membrane

Answer 6

7.5 to 10nm (only seen through electron microscopy)

Question 7

where are carbohydrates located in membrane

Answer 7

exterior facing matrix

Question 8

2 general features of membranes

Answer 8

1. dynamic.fluid structure
2. asymmetrical

Question 9

what are 3 main components of cytoskeleton

Answer 9

1. microtubules
2. microfilaments
3. intermediate filaments

Question 10

cillium/flagellum

Answer 10

9 + 2 pattern (spiral tube, fingers)

Question 11

centriole

Answer 11

9 microtubule triplets linked in pinwheel arrangement

at 2 poles during mitosis

Question 12

actin/microfilaments

Answer 12

• very abundant
• high cocn. at cell periphery (can move cell through rapid de/polymerisation. eg white blood cells)
• important for cell motility (cleavage of mitotic cells)

Question 13

myosin

Answer 13

• low abundance
• high abundance in muscle

Question 14

where are microfilaments located

Answer 14

1. skeletal muscle
2. beneath plasma membrane
   3.scattered in cytoplasm

Question 15

where is intermediate filament found

Answer 15

epithelium (skin)

Question 16

what are microvilli

Answer 16

microvilli are finger-like membrane protrusions, supported by the actin cytoskeleton, and found on almost all cell types