BIOCHEM LAB_ QUIZ 1

Question 1

Organic molecules that serve as the building blocks of proteins

Answer 1

Amino Acids

Question 2

Short chains of amino acids

Answer 2

Peptides

Question 3

Longer and complex peptides

Answer 3

Polypeptides

Question 4

Structure of Amino Acids

Answer 4

Amino Group - left
Side chain or R group - bottom
Carboxyl group - right
Hydrogen - up
Alpha carbon - center

Question 5

Proton or hydrogen donor

Answer 5

Acid

Question 6

Proton acceptor / accepts hydrogen

Answer 6

Base

Question 7

Molecule that contains both positive and negative charge

Answer 7

Zwitterion form

Question 8

Negative charge in zwitterion form

Answer 8

Carboxylate ion

Question 9

Positive charge in zwitterion form

Answer 9

Ammonium ion

Question 10

Process of formation of peptides

Answer 10

Condensation

Question 11

Happens when the reactive amino group of an amino acid interacts with the reactive carboxylic group of another amino acid

Answer 11

Condensation

Question 12

Librates water molecules

Answer 12

Condensation

Question 13

2 amino acids

Answer 13

Dipeptide

Question 14

3 amino acids

Answer 14

Tripeptide

Question 15

50 amino acids or more

Answer 15

Proteins or polypeptides

Question 16

Aka amphoteric

Answer 16

Acid-base property

Question 17

Act as a base and an acid depending on the reactant involved in the chemical reaction

Answer 17

Amphoteric

Question 18

Acts as a base when an acid is added in the system

Answer 18

Amino acid

Question 19

Acts an an acid when a base is added in the system

Answer 19

Amino acids

Question 20

Results to overall charge of POSITIVE because?

Answer 20

Because of the reactive ammonium ion

Question 21

Donates 1 hydrogen ion to the OH group from the base and becomes an _________ group

Answer 21

Amino

Question 22

Donates 1 hydrogen ion to the OH group from the base

Answer 22

Ammonium ion

Question 23

This results to an overall charge of NEGATIVE because?

Answer 23

Coming from the carboxylate

Question 24

There is a certain pH where is EVENLY BALANCED between 2 forms

Answer 24

Isoelectric point

Question 25

As the dipolar zwitterion with a net charge of ________

Answer 25

Zero

Question 26

There is a negative and a positive pole

Answer 26

Dipolar

Question 27

As the pH moves away from the isoelectric point, the amino acids may exist as __________ or an __________.

Answer 27

Cations and ion

Question 28

As the pH become lower than the isoelectric point, it happens when acids is added in the system. The amino acids become _______ charge.

Answer 28

positively

Question 29

As the pH become higher than the isoelectric point, it happens when acids is added in the system. The amino acids become _______ charge.

Answer 29

negatively

Question 30

Four different functional groups are attached to it

Answer 30

Chiral carbon

Question 31

four different functional group are attached to it

Answer 31

CHIRAL CARBON

Question 32

because of this property, the alpha/chiral carbon is assymetric

Answer 32

STERIOCHEMISTRY

Question 33

all of the functional groups are the same, but the location of the functional groups are mirror images but non-superimposable

Answer 33

ENANTIOMERS

Question 34

amino acids can exist as enantiomers, they exhibit optical property known as

Answer 34

OPTICAL ACTIVITY

Question 35

determined by the use of POLARIMETER

Answer 35

OPTICAL ACTIVITY

Question 36

positive for dextrorotatory

Answer 36

clockwise

Question 37

negative for levorotatory

Answer 37

counter clockwise

Question 38

capacity to interact with water

Answer 38

polarity

Question 39

hydrophobic

Answer 39

Non-Polar Amino Acids

Question 40

water-fearing

Answer 40

non-polar amino acids

Question 41

1 amino, 1 carboxylic, and a side chain that polar but neutral

Answer 41

polar neutral amino acids

Question 42

1 amino acids, 2 carboxyl group

Answer 42

Polar Acidic Amino Acids

Question 43

2 amino groups. 1 carboxyl group

Answer 43

Polar basic amino acid

Question 44

Generally soluble in water

Answer 44

Amino acids

Question 45

Insoluble in non-polar organic solvents

Answer 45

Amino acids

Question 46

Crystal in solids with high melting point

Answer 46

Melting points

Question 47

200-300 *c

Answer 47

Melting point

Question 48

Tastes of amino acids

Answer 48

- sour or umami - tasteless (leu) - sweet (gly,ala,val) - bitter (arg, lle)

Question 49

Sweet or bitter taste

Answer 49

L-amino acids

Question 50

Sweet flavor

Answer 50

D-amino acids

Question 51

Formed by acid-base neutralization reaction

Answer 51

Salt formation

Question 52

When a base reacts with an amino acid

Answer 52

Formation of salt with alkis

Question 53

Chemical reaction that takes place in metabolic processes that involve enzymes

Answer 53

Decarboxylation

Question 54

Removal of a carboxyl group from an amino acid

Answer 54

Decarboxylation

Question 55

This takes place when an amino acids contains 2 carboxyl groups in the structure

Answer 55

Reaction with Ammonia

Question 56

-nH2

Answer 56

Amino group

Question 57

Formation of salt with an acid

Answer 57

Salt formation

Question 58

The reactive amino group reacts with ninhydrin to form Ruhemanns’ purple

Answer 58

Reaction with nynhydrin

Question 59

Quantitative determination of amino acids & proteins

Answer 59

Ninhydrin test

Question 60

Transfer of an amino group from an amino acid to a keto acid to form a new amino acid catalyzed

Answer 60

Transamination

Question 61

Transfer of an amino group from an amino acid to a keto acid to form a new amino acid catalyzed

Answer 61

Transaminases

Question 62

Provides NH3+ for urea synthesis

Answer 62

Oxidative deamination