amino acids, amides and chirality

Question 1

general formula for an alpha-a.a

Answer 1

RCH(NH2)COOH

Question 2

structure of an alpha-a.a

Answer 2

amine group attached to the second carbon next to the carboxyl group

Question 3

structure of a beta-a.a

Answer 3

amine group attached to the third carbon next to the carboxyl group

Question 4

what are the reactions of the carboxylic acid group in a.as

Answer 4

with alkalis- neutralisation

esterification with alcohols

Question 5

what reactions can the amine group of a.a undergo

Answer 5

with acid to form ammonium salts

Question 6

ionic eq for alpha a.a and HCl

Answer 6

.

Question 7

eq for a.a and alkali

Answer 7

.

Question 8

eq for a.a and XS ethanol in the presence of H2SO4

Answer 8

.

Question 9

what allows a.a to undergo reactions

Answer 9

the lone pair on the N accepts H+s

OH an O of c.acid have lone pairs they can donate

Question 10

functional groups on a.a

Answer 10

amine group

carboxylic acid group

Question 11

how many common a.a do our body have

Answer 11

20

Question 12

what do a.a differ by

Answer 12

side chain, R group, variable

Question 13

zwitterion

Answer 13

ion with positive and negative charge

Question 14

how is a zwitter ion formed

Answer 14

amine group on a.a. acc prton from c.acid group

Question 15

what is the overall charge of a zwitter ion

Answer 15

has no overall charge

Question 16

why don’t zwitter ions have an overall charge

Answer 16

the positive charge on the N and negative charge on the O cancel out

Question 17

isoelectric point

Answer 17

pH at which the zwitter ion is formed

Question 18

what happens when an a.a is added to a solution with a pH greater than its isoelectric point

Answer 18

a.a acts as acid and loses a proton

Question 19

what happens when an a.a is added to a sol w/pH below i.point

Answer 19

a.a beh as base and gains a proton

Question 20

what are amides the products of

Answer 20

reactions of acyl chlorides w/ammonia and amines