Chapter 1126 cards

Tagged as: astronomy, biology, microbiology, act, chemistry, biochemistry

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1

Plasma Membrane

a fatty film so thin and transparent that it cannot be seen directly in the light microscope

2

plasma membrane structure

two-ply sheet of lipid molecules about 5nm or 50 atoms thick

3

Which description is correct for the transcription regulators?

1)Usually bind to the major groove 2) binds noncovalently with the sides of bases 3) Binding to regulatory DNA sequences act as switches to control transcription 4) Hydrogen bonds


5

General functions of membranes:

1) receive info from outside; initiate intracellular events 2) Import / export- transport specific lipids and proteins 3) provides fluidity 4) selectively permeable barrier


7

All Cells are made up of:

lipids and proteins and share a common general structure

8

characteristics of membrane lipids

Hydrophyllic head with two hydrophobic hydrocarbon tails ampipathic


10

the most common type of phospholipid in most cell membranes is:

phosphatidylcholine polar head- choline Unsaturated (bend in the tail)


12

example of a glycolipid

have sugars as part of their hydrophobic head instead of the phosphate group polar covalent bond

13

what type of bonds are in the fluid mosaic model?

mainly noncovalent interactions

14

leaflet

lipids and many proteins move within a single layer

15

mosaic

combination of different things in one entity

16

How do lipids move inside the leaflets?

move laterally, flex, or rotate within a single leaflet. Rarely flip-flop from one leaflet to another . "lipid shuffle"


18

amphipathic molecules contain:

hydrophyllic head (phosphate) and Hydrophobic hydrocarbon tail ( fatty acid)

19

cholesterol

- decreases membrane fluidity (no cell wall) - easily inserts between unsaturated fatty acid tails - 4 rings that are rigid

20

lipid bilayers are

asymmetrical

21

new membrane is synthesized in the

Endoplasmic Reticulum



24

Golgi recieves vesicles from

Endoplasmic reticulum


26

Functional Types of membrane proteins:

1) Transporters 2) Anchors 3) Receptor 4) Enzymes