Chemistry Review

Question 1

majority of lipids in a membrane are ________

Answer 1

phospholipids

Question 2

molecules that are both hydrophilic and hyrdophobic are_____

Answer 2

amphipathic

Question 3

longer hydrophobic tails _________ the fluidity of the membrane

Answer 3

decreases

Question 4

shorter hydrophobic tails ________ the fluidity of the bilayer

Answer 4

increases

Question 5

most phospholipids have ______ hydrophobic tails

Answer 5

two

Question 6

carbon atoms have _____ valence electrons

Answer 6

4

Question 7

covalent bonds are the sharing of electrons in the _______ shell

Answer 7

valence

Question 8

a carbon atom with single covalent bonds can bond to _______ hydrogens

Answer 8

4

Question 9

a carbon with a double covalent bond can bond to ____ other molecules

Answer 9

3

Question 10

carbon tails with double covalent bonds are called ___________

Answer 10

unsaturated

Question 11

saturated hydrophobic tails have _________ bonds

Answer 11

covalent

Question 12

a membrane with unsaturated hydrophobic tails is ________ fluid

Answer 12

more

Question 13

a membrane with saturated hydrophobic tails is _______ fluid

Answer 13

less

Question 14

margarine is made of hydrophobic tails with ________ covalent bonds

Answer 14

single

Question 15

olive oil is made of hydrophobic tails with ______ covalent bonds

Answer 15

double

Question 16

double covalent bond =

Answer 16

unsaturated

Question 17

why do double covalent bonds lead to fats that tend to be more fluidic?

Answer 17

the double covalent bond makes kinks in the tail, which prevents a matrix from forming

Question 18

permeability factors

Answer 18

hydrophilicity and size

Question 19

T/F hydrophobic molecules pass easily through a cell membrane

Answer 19

T

Question 20

Can hydrophilic molecules pass through the cell membrane?

Answer 20

Yes, if they’re partially charged

Question 21

cell membranes are generally __________ to ions

Answer 21

impermeable

Question 22

cell membranes are generally impermeable to _____

Answer 22

ions

Question 23

glucose is very _______ to pass through the cell membrane

Answer 23

unlikely

Question 24

T/F hydrophobic molecules easily pass through the cell membrane

Answer 24

F

Question 25

hydrophobic molecules are charged or uncharged

Answer 25

uncharged

Question 26

Does O2 readily pass through the cell membrane?

Answer 26

yes!

Question 27

Does Co2 readily pass through the cell membrane?

Answer 27

yes!

Question 28

Does H20 readily pass through the cell membrane?

Answer 28

yes!

Question 29

Does ethanal readily pass through the cell membrane?

Answer 29

yes!

Question 30

Are charged molecules likely to pass through a membrane?

Answer 30

no!

Question 31

Does NA+ readily pass through the cell membrane?

Answer 31

no!

Question 32

3 regions of a transmembrane protein

Answer 32

extracellular, membrane interior, intracellular

Question 33

lower stability =

Answer 33

higher G , lower electron affinity

Question 34

higher stability =

Answer 34

lower G , higher electron affinity