Exam 4

Question 1

What are the structural components of phospholipids?

glycerol
fatty acids
polar amine
aromatic ring
phosphate

Answer 1

glycerol, fatty acids, polar amine, phosphate

Question 2

what type of lipids are cholesterol and bile salts?

steroids
triglycerides
fatty acids
waxes

Answer 2

steroids

Question 3

what chemicals would you use to make margarine from canola oil?

a hydrolysis enzyme
an acid in water
hydrogen & metal catalyst
a strong base in water

Answer 3

hydrogen & metal catalyst

Question 4

what do you expect to obtain if you react pork lard with a concentrated aqueous solution of sodium hydroxide?

more saturated triglycerides
glycerol & fatty acids
glycerol & fatty acid salts

Answer 4

glycerol & fatty acid salts

Question 5

which fatty acid is predicted to have the lowest melting point?

Ch3CH2CH=CHCH=CH(CH)5COOH
CH3CH2CH=CH(CH2)7COOH
CH3(CH2)10COOH

Answer 5

Ch3CH2CH=CHCH=CH(CH)5COOH

Question 6

select the D-carbohydrates (check sc)
A
B

Answer 6

B

Question 7

The functions of carbohydrates in living organisms include:

part of nucleic acids & glycoproteins
transport of nutrients
source of energy
catalytic

Answer 7

part of nucleic acids & glycoproteins
source of energy

Question 8

what is the total number of stereoisomers that this sugar has?

  CHO H             OH H             OH H             OH
CH2OH

Answer 8

8

Question 9

what type of saccharide is cellulose?

monosaccharide
disaccharide
polysaccharide

Answer 9

polysaccharide

Question 10

what carbohydrate is used as a storage form of energy in animals?

glycogen
amylose
cellulose
amylopectin

Answer 10

glycogen

Question 11

An enzyme ______

decreases the rate of a reaction
increases the rate of reaction

Answer 11

increases the rate of a reaction

Question 12

what type of enzymatic inhibitors are cyanide and mercury?

competitive inhibitors
irreversible inhibitors
noncompetitive inhibitors

Answer 12

irreversible inhibitors

Question 13

urease acts exclusively on urea to produce ammonia and carbon dioxide. Urease has__ specificity/

stereochemical
relative
absolute

Answer 13

absolute

Question 14

what type of enzyme does this type of reaction:
conversion from one isomer to one another

isomerases
ligases
hydrolyses

Answer 14

isomerases

Question 15

what type of enzyme does this type of reaction:
break bonds with water consumption

isomerases
ligases
hydrolyses

Answer 15

hydrolases

Question 16

what type of enzyme does this type of reaction:
formation of new bonds with usage of energy

isomerases
ligases
hydrolyses

Answer 16

ligases

Question 17

in the regulation of enzymatic activity, enzymes that are formed and released in an inactive form and activated when needed are called___?

apoenzymes
holoenzymes
proenzymes

Answer 17

proenzymes

Question 18

disregarding glycine, the simplest amino acid, what are the mandatory structural features of amino acids?

an amino group
an aromatic ring
a carboxyl group
a hydrogen atom

Answer 18

an amino group
a carboxyl group

Question 19

what is the name of the bond formed between the carboxyl group of one amino acid and the amino group of another amino acid in a protein molecule?

disulfide bond
amino acid bond
ester bond
peptide bond

Answer 19

peptide bond

Question 20

what would you use to disrupt the primary level of organization of a protein?

hydrolysis
denaturation
hydrogenation

Answer 20

hydrolysis

Question 21

what type of protein function is exemplified by the action of rhodopsin in the retina?

protective
nerve impulse transmission
structural
transport of nutrients

Answer 21

nerve impulse transmission