Cells and organelles Flashcards Preview

Phase 1 week 1 - the skin > Cells and organelles > Flashcards

Flashcards in Cells and organelles Deck (27):
1

What is the plasma membrane made up of?

Phosphilipid bilayer

2

What do integral membrane proteins allow?

The transport of small molecules across the membrane

3

What do membrane receptors do?

They interact with ligands to initiate a cascade of chemical signals

4

What is DNA packed as in the nucleus?

Chromatin

5

What structure is bound by a double membrane

Nucleus

6

What supports the nucleus' membrane?

Lamins

7

What are the 2 functions of mitochondria

Site of ATP synthesis and release cytochrome C to induce apoptosis

8

What organ does mitochondrial dysfunction effect most?

Brain

9

What process occurs at the rough ER

protein synthesis

10

What process occurs at smooth ER

Calcium storage and lipid synthesis

11

What is the function of the golgi

To sort proteins

12

Why do lysosomes have an impermeable membrane?

Because they contain hydrolytic enzymes

13

What disease does lysosome dysfunction cause?

Tay-Sachs disease

14

What is the function of the cytoskeleton

Supports the plasma membrane

15

What are the 3 filaments of the cytoskeleton

Microtubules, intermediate filaments and microfilaments

16

Give an example of microtubule

Cillia and flagellum

17

What disease is caused by a defect in cillia

Kategeners disease

18

What is the function of anchoring junctions

Provide mechanical stabiulity to groups of epithelial cells

19

What does an adherens junction join

Cell to actin

20

What does a desmosome junction join

intermediate filament to cell

21

What does a hemidesmosome junction join

intermediate filament to ECM

22

What can a defective anchoring junction cause?

Cancer

23

What does a tight junction allow

cell to cell contact

24

What does a tight junction prevent

Prevents the mixing of membrane proteins and the diffusion if molecules between adjacent cells by creating a barrier

25

What do GAP junctions allow

The passage of small molecules

26

Where are GAP junctions found

In most cells

27

What do GAP junctions connect?

The cytoplasm with adjacent cells