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Flashcards in Lesson 1.7 Deck (38):
1

According to this model, membrane consist of lipid by layer and globular Proteins which are in bedded within the lipid bilayer

Fluid mosaic Model by S. Singer and G. nicolson

2

Has a hydrophobic and hydrophilic regions

Lipid bilayer

3

Proteins also known as

Glycoproteins

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Lipids also known as

Glycolipids

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The movement of substances through membranes without using energy

Passive transport

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Three kinds of passive transport

Simple diffusion
Osmosis
Facilitated Diffusion

7

Is the movement of substances from a region of higher concentration to a region of lower concentration

Simple diffusion

8

Is a difference in concentration of a certain substance in one hour and the concentration in another Adjacent area

Concentration gradient

9

Factors that affect diffusion across the semi permeable membrane

Size
Charge of particles

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Small non-polar molecules That can go in and out freely

H2O, 02, CO2, fatty acid‘s

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Large molecules like, cannot go in and out freely

Proteins and carbohydrates

12

Ios such as, cannot pass through readily because of the presence of hydrophobic region

OH, K+, Ca+++

13

The diffusion of water across a selectively Premable membrane

Osmosis

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Moves down it’s concentration gradient

Water

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Three teams that are used to indicate the differences between two solutions

Isotonic, hypertonic and hypotonic

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Comes from the Latin root meaning Strength

Suffix tonic

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Refers to the concentration of solutes in the solutions

Tonicity and strength

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The concentration of solutes Surrounding this so equals the concentration of solute inside the cell

Isotonic solution

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The concentration of solute surrounding the cell is higher than that inside the cell

Hypertonic solution

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If the cells loses too much water, the cell will shrink

Plasmolysis (or crenation in the case of animal cell)

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The concentration of solutes surrounding this song is lower that that inside the cell

Hypotonic solution

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place in solution of different sugar concentration

Red blood cells or RBC

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•Rbc an external solution or the same concentration
• water entering the RBC = water leaving
• what happens? No changes in RBC sizes

Isotonic

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•rbc are place in a very concentrated sugar solution
• RBC are filute compred to external solution and lose water
• waht happens? RBC Shrink

HYPERTONIC

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•RBC are place in dilute sugar solution
• RBC take up water
• What happens? RBC swell and finally burst

Hypotonic

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It is a form of passive transport that requires transport proteins in the membrane

Facilitated diffusion

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Is an example of large polar molecule that is transported through the membrane by facilitated diffusion

Glucose

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Bind to specific salute to be transported and cause changes in the shape of protein

Carrier proteins

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Not bind the solute

Channel proteins

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Is the movement of substances from the region of lower concentration to a region of greater concentration in the choirs expenditure cellular energy

Active transport

31

It is one of the well studied examples of active transport

Sodium potassium pump

32

Two types of movement across cell membrane

Endocytosis
Exocytosis

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The cell engulfs particles into a pouch formed bu the in folding of the cell membrane

Endocytosis

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Three types of endocytosis

Phagocytosis
Pinocytosis

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Cell eating, the cell engulfs solid particles into much larger vesicles, sometimes called VACUOLES

Phagocytosis

36

In human, two types of white blood cells specialized in phagocytosis

Neutrophils
Manocytes

37

cell drinking, it is similar to phagocytosis except that the cell engulfs droplets of fluid instead of solid particles, also forming latge vacuoles within it.

Pinocytosis

38

It is the reverse of endocytosis

Exocytosis