exam 1 review

Question 1

acidic amino acids

Answer 1

aspartate (D)
glutamate (E)

Question 2

basic amino acids

Answer 2

lysine (K)
arginine (R)

Question 3

polar amino acids

Answer 3

(S) serine
(T) threonine
(C) cysteine
(N) asparagine
(Q) glutamine

Question 4

non-polar amino acids

Answer 4

(A) alanine
(V) valine
(L) leucine
(I) isoleucine
(M) methionine

Question 5

aromatic amino acids

Answer 5

(F) phenylalanine
(W) tryptophan
(Y) tyrosine
(H) histidine

Question 6

“structural” amino acids

Answer 6

(G) glycine
(P) proline

Question 7

amino acids found in humans are

Answer 7

left handed (L-aa’s)
s configuration

Question 8

histidine’s charge at pH 7

Answer 8

+0.1

Question 9

aspartic acid charge at pH 7

Answer 9

-1

Question 10

glutamic acid at pH 7

Answer 10

-1

Question 11

arginine charge at pH 7

Answer 11

+1

Question 12

lysine charge at pH 7

Answer 12

+1

Question 13

cysteine charge at pH 7

Answer 13

-0.1

Question 14

phi bond

Answer 14

between N and C

Question 15

psi bond

Answer 15

between C and C

Question 16

L = ____ = ____

Answer 16

S, counterclockwise

Question 17

D = ____ = _____

Answer 17

R, clockwise

Question 18

van der wals

Answer 18

attraction/repulsion

Question 19

dipole dipole interactions

Answer 19

partialcharges

Question 20

London dispersion forces

Answer 20

result of fluctuating induced electrostatic forces

Question 21

sp3 hybridization shape

Answer 21

tetrahedral

Question 22

sp2 hybridization shape

Answer 22

trigonal planar

Question 23

in eukaryocytes, proteins have __ amino acids, and __ sugars

Answer 23

L, D

Question 24

L-amino acids have a ____ configuration

Answer 24

S = counterclockwise

Question 25

D-sugars have a __ configuration

Answer 25

R = clockwise

Question 26

proteins start at the __ terminal and end at the __ terminal

Answer 26

N-, C-

Question 27

nucleic acids begin at the ______ and end at the ______

Answer 27

5’, 3’

Question 28

carbs start at the ______ and end at the ______

Answer 28

non-reducing, reducing

Question 29

order of strength in non-covalent bonds

Answer 29

van der waals (weakest), hydrogen bonds, ionic, hydrophobic (strongest)

Question 30

dipole moment

Answer 30

unequal distribution of electrons

Question 31

henderson-hasselbach equation

Answer 31

pH = pKa + log ( [conjugate base] / [weak acid] )

Question 32

[H+] [OH-] =

Answer 32

1 x 10^-14

Question 33

pH =

Answer 33

-log [H+]

Question 34

pOH =

Answer 34

-log [OH-]

Question 35

strong acids

Answer 35

hydrochloric acid
sulfuric acid
nitric acid

Question 36

weak acids

Answer 36

phosphoric acid
acetic acid

Question 37

pKa is the

Answer 37

balance point

Question 38

pKa =

Answer 38

-log(Ka)

Question 39

larger Ka means ______ pKa

Answer 39

smaller

Question 40

1 pH difference is _________ difference

Answer 40

100 fold

Question 41

pH =

Answer 41

-log [H+]

Question 42

[H+]=

Answer 42

10^-pH

Question 43

draw right handed aa
draw left handed aa

Question 44

what kind of bond is a peptide bond

Answer 44

amide bond

Question 45

the double bond characteristic of a peptide bond prevents

Answer 45

bond rotation between adjacent amino acids

Question 46

peptide bonds are in a _______ confirmation

Answer 46

flat, planar

Question 47

______ does occur next to the chiral carbons

Answer 47

rotation

Question 48

types of secondary protein structures

Answer 48

alpha helixes and beta sheets

Question 49

tertiary structure is determined by

Answer 49

global protein folding

Question 50

classes of protein function

Answer 50

enzymes - kinase
regulatory
transport
storage
motility - actin
structural - keratin
scaffold
protective

Question 51

most common structural protein forms

Answer 51

globular - hemoglobin
fibrous - keratin
modular - cellulosomes