lecture 8

Question 1

bonding arrangements

Answer 1

• carbon atoms can form chains or rings

- other atoms project form the carbon backbone

Question 2

4 major atomic components of organic molecules

Answer 2

Hydrogen ( valence=1)
Oxygen ( valence=2)
Nitrogen (valence=3)
Carbon (valence=4)

Question 3

condensation reactions

Answer 3

form polymers from subunites (monomers)
enzymes remove -OH from one molecule, H form another, form bond between two molecules
discarded atoms can join to form water

Question 4

Hydrolysis

Answer 4

a typle of cleavage reaction
breaks polymers into smaller units
enzymes split molecules into two or more parts
an -OH group and an H atom derived from water are attached at exposed sites

Question 5

parts of every cell

Answer 5

• bounded by plasma membrane
• cytosol inside
• chromosomes (with genes in the form of DNA)
• ribosomes (make proteins, instructed by genes)

Question 6

function of skin cells

Answer 6

protection

Question 7

what part of the phospholipid bilayer is hyrophilic and which is hydrophobic?

Answer 7

head is hydrophilic and tail is hydrophobic

Question 8

cholesterol

Answer 8

• amphipathic lipid
• are in membranes of animal cells
• reduces membrane fluidity in humans at normal temperatures
• temperature buffer for your cells
• at low temps membranes solidify

Question 9

what types of poisons would be absorbed through your skin?

Answer 9

non-polar

Question 10

the main stuctural component of a biological membrane is?

Answer 10

phospholipid

Question 11

a membrane is ______ on its surface and ____ in its center

Answer 11

polar, non polar