Structure of Amino Acid

Question 1

What makes an amino acid acidic?

Answer 1

Carboxyl group COOH
COOH partially dissociated in water to release hydrogen. Hydrogen powers pH
COOH has negative charge

Question 2

What is the basic grouo of Amino Acids?

Answer 2

Amine group NH2

Can accept hydrogen when in solution to become positively charged

Question 3

What is unique between amino acids?

Answer 3

R group

Group differed from one amino acids to another

Question 4

What is special about the R group?

Answer 4

R group variations give amino acids there different characteristics

Question 5

Why are amino acids called amphoteric?

Answer 5

They are both acid is and basic.

Can act as buffers

Question 6

What is buffer?

Answer 6

Substances that resist changes in pH

Keep pH constant

Question 7

How is an amino acid both a cation and anion at the same time?

Answer 7

Carboxyl group COOH is negative

Amine group NH2 is positive

Question 8

What is it called when the amino acid is both positively and negatively charged?

Answer 8

Zwitterion or

Double ion

Question 9

What is the overall net charge of zwitterion?

Answer 9

Neutral

Question 10

When does an amino acid exist as a zwitterion?

Answer 10

Certain pH- The Isoelectric Point

Question 11

What is the structure of an amino acid?

Answer 11

NH2- HCR - COOH

Question 12

Where is the double bond in an amino acid?

Answer 12

In the carboxyl group

between C=O, C-OH

Question 13

What are the 4 types of R group?

Answer 13

Nonpolar hydrophobic R group
Polar hydrophilic R group
Polar hydrophilic basic R group
Polar hydrophilic acidic R group