FINAL cytoskeleton and organelles

Question 1

what is the diameter of an actin filament

Answer 1

7nm

Question 2

diameter of an intermediate filament

Answer 2

10nm

Question 3

diameter of a microtubule

Answer 3

25 nm

Question 4

which cytoskeletal filaments act as train tracks for organelles and vesicles

Answer 4

microtubules

Question 5

which cytoskeletal filaments are involved in endocytosis

Answer 5

actin

Question 6

the type of junction which connects the basal surface of cells to a basement membrane

Answer 6

hemidesmosome

Question 7

type of junction which attaches actin in one cell to actin in another cell

Answer 7

adherens

Question 8

type of junction responsible for the flow of ions in heart muscle cells

Answer 8

gap

Question 9

type of junction that prevents the leakage of fluids

Answer 9

tight

Question 10

organelle that is essentially a small sac of digestive enzymes that functions in degrading worn out organelles

Answer 10

lysosomes

Question 11

which organelle is the site of new membrane synthesis in a cell

Answer 11

smooth ER

Question 12

which organelle receives proteins and lipids from the ER modifies them and dispatches them

Answer 12

golgi

Question 13

which organelle sorts ingested molecules and recycles some back into the plasma membrane

Answer 13

endosome

Question 14

which organelle contains enzymes used in a variety of oxidative reactions that break down lipids and destroy toxic molecules

Answer 14

peroxisomes

Question 15

organelle that is the site of final protein modification

Answer 15

golgi

Question 16

organelle that contains hydrolytic enzymes

Answer 16

lysosome

Question 17

protein modification begins in which organelle

Answer 17

rough ER

Question 18

how do proteins know to enter the ER

Answer 18

signal sequence

Question 19

autophagy

Answer 19

lysosome breaks down dead/dying organisms

Question 20

what organelle contains enzymes to make a peroxide

Answer 20

peroxisomes

Question 21

avg number of mitochondria per cell

Answer 21

1700

Question 22

avg number of lysosomes per cell

Answer 22

300

Question 23

t/f most eukaryotic cells have one nucleus

Answer 23

true

Question 24

organelle that is the site of lipid synthesis

Answer 24

smooth ER

Question 25

list three ways proteins are imported in eukaryotic cells

Answer 25

1) across nuclear pores
2) directly across organelles
3) transport by vesicles

Question 26

what is protein modification; examples

Answer 26

specialization; glycoproteins and lipoproteins

Question 27

which organelle organizes and stores chromosomes

Answer 27

nucleus

Question 28

proteins and lipids leave the ER via a

Answer 28

membrane bound vesicle

Question 29

everything in the cell except the nucleus is termed

Answer 29

cytoplasm

Question 30

energy related organelle which converts sugar to ATP

Answer 30

mitochondria

Question 31

organelle involved in protein synthesis

Answer 31

ribosome