3 Boundaries & membranes

Question 1

Eukaryotic cells have _________________ boundaires.

Answer 1

Internal

Question 2

________ cells have bounaries.

Answer 2

All

Question 3

Internal boundaires allows formation of specialised ____________________. with paticular ____________ and ________ processes and segregation of harmful _____________.

Answer 3

Microenvironments
solutes
cell
activities

Question 4

The __________ boundary is the plasma membrane.

Answer 4

Principle.

Question 5

Membranes are ____________ like, composed of ___________, ______________ and carbohydrates.

Answer 5

Sheet-like.
Lipids.
Proteins.

Question 6

Thickness of lipid bilayer:

Answer 6

5-8nm.

Question 7

Mmebranes are ______________ with hydrophillic ____________ and hydrophobic _____________.

Answer 7

Amphipathic.
Head.
Tail.

Question 8

Name of model with integral proteins in lipid bilayer and peripheral proteins sticking out and covalently bound lipid-anchored proteins on surface.

Answer 8

Fluid Mosaic Model.

Question 9

______ face outside because they’re ___________

Answer 9

Heads.
Hydrophilic

Question 10

__________ face inside because they’re ____________

Answer 10

Tails.
Hydrophobic.

Question 11

4 Key structual features of membranes:

Answer 11

1 Self assembling.
2 Lipids are fluid. Proteins are restricted.
3 Assymetrical
4 Integral proteins pass through bilayer.

Question 12

7 Components of membranes:

Answer 12

Carbohydrate. Glycolipid. Transmembrane protein. Glycoprotein. Peripheral protein. Cholesterol. Fillaments of cytoskeleton.

Question 13

Membrane functions:

Answer 13

1 Semi-permeable. Small uncharged or hydrophobic molecules pass through. Large polar molecules or ions cannot. H2O can pass through, can be assited by aquaporin channels.
2 Transporting solutes. Integral proteins can passage or actively transport or act as transport channels.
3 Flexibility for cell movement/divsion.
4 Responds to externalsignals via receptors.
5 Intercellular communication via surface carbohydrates conferring cell identity.

Question 14

2 Example of small uncharged or hydrophobic molecules:

Answer 14

O2. CO2. N2. Benzene. H2O. Glycerol. Ethanol.

Question 15

2 Examples of large nonpolar molecules or ions:

Answer 15

Amino acids. Glucose. Nucleotides. H+. NA+. Cl-.

Question 16

Mmebrane fluidity can be adjusing by altering _____ conent.

Answer 16

Lipid.

Question 17

The thin plasma membrane often needs aditional ________ and ________________.

Answer 17

Support. Proetection.

Question 18

Bacteria have _____________ cell wall for _____________.

Answer 18

Peptidoglycan. Rigidity.

Question 19

Fungi have ________ cell wall.

Answer 19

Chitin.

Question 20

Plants have _____________ cell wall for _________ and _________.

Answer 20

Cellulose.
Strength.
Support.

Question 21

Cell walls have means to be ________________.

Answer 21

Permeable.

Question 22

Animals have a protein network called __________ ____________ under plasma membrane.

Answer 22

Cell Cortex.

Question 23

Erythrocyte’s cell cortex is _____ ______ attached to plasma membrane via _____________ proteins.

Answer 23

Spectrin meshwork.
Anchor

Question 24

Some cells have a _________ exterior coating based on sugar molecules.

Answer 24

Glycolax.

Question 25

Some cells have more complex and organized extracellular matrix _____ fibres protect cell from damage and idenity for ________________.

Answer 25

Collagen.
Recognition.