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BSC 2010 - Biology I > Exam #3 > Flashcards

Flashcards in Exam #3 Deck (183)
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1

There's no input of energy in ________ transport.

passive

2

What are the two modalities of passive transport?

Simple diffusion and facilitated diffusion

3

What is the difference between simple diffusion and facilitated diffusion?

Simple diffusion: from high to low directly across a lipid bilayer without the assistance of any other molecule.
Facilitated diffusion: from high to low with the assistance of a transport protein

4

Most of the substances we need to get into the cell are _____/and or _______

polar and or charged

5

What are the two types of transport proteins?

Channels and carriers

6

Ions, which you may know as electrolytes...move through _______ _______.

channel proteins

7

Does water diffuse across a pure lipid bilayer?

Not easily, it is partially blocked

8

What are the water channels called to help in water diffusion?

Aquaporins

9

Water moves to areas of ______ solute concentration

higher

10

Water moves to where the solutes are _____ in concentration

higher

11

Water balance, also called ____________, is a primary level of homeostasis that all life must maintain

osmoregulation

12

Protists maintain osmoregulation by expelling excess water using a ________ _______.

contractile vacuole

13

As water comes in, the ____ ______ protects the cell from bursting

cell wall

14

What's the difference between a hypotonic and a hypertonic solution?

Hypotonic: low solute concentration, water flows into the cell
Hypertonic: high solute concentration, water flows out of the cell

15

Which of the three (hypotonic, hypertonic, isotonic) environments does a plant prefer?

HYPOTONIC

16

Channels are _____ protein completely spanning the membrane

integral

17

Channels have a ________ pore that recognizes ____ type of solute

hydrophilic, ONE

18

All proteins have an elaborate confirmation...but some proteins have the ability to.....

change confirmation

19

A ______ protein can change its confirmation, and in so doing, it allows a solute to pass through

carrier

20

Now, who MOVES into cells this way?

Sugars. Glucose....

21

Now, who MOVES into cells this way? Sugars. Glucose....through the ______ transporter...fructose through the ______ transporter

glucose, fructose

22

Do lipids need channels or carriers?

No, they go right through

23

If we have this way of bringing sugar into the cell, why do we need active transport?

If the sugar is not high in the environment, which won't always be the case...in which case WE GOTTA FORCE!
WE NEED THAT GLUCOSE! WE NEED IT NOW!

24

Monosaccharides (sugars) and amino acids use _______

carriers

25

Carriers are ______ membrane protein..._____ and _____ molecules.

integral. polar and charged molecules

26

What are the two types of active transport?

Primary (1º) active transport
Secondary (2º) active transport

27

Primary (1º) active transport is the way we concentrate _____ through via ____ ______

ions via ion pumps

28

What is the energy that drives ion pumps?

ATP

29

Where do you find a concentration of sodium about the cell? Inside or outside the cell?

OUTSIDE

30

In your body, your cells have more ______ outside, than inside.

sodium