Biochem Test 3

Front 1

Catabolism is an essentially __________ process.

Back 1

exothermic

Front 2

Direct phosphorylation of glucose by ATP leads to the formation of

Back 2

glucose-6-phosphate

Front 3

Glycolysis occurs within the

Back 3

cytoplasm

Front 4

What sugars can enter the glycolysis pathway?

Back 4

glucose
fructose
galactose

Front 5

What coenxyme is used in most oxidation-reduction reactions of carbohydrate catabolism?

Back 5

NAD/NADH

Front 6

What is the product of the first stage of glycolysis?

Back 6

glyceraldehyde-3-phosphate

Front 7

The net ATP output for glycolysis is ____ per glucose molecule.

Back 7

2 ATP

Front 8

What is the final product of glycolysis?

Back 8

pyruvate

Front 9

What coenzyme must be reoxidized so that glycolysis can continue?

Back 9

NADH

Front 10

Under aerobic conditions in the body, pyruvate is converted to

Back 10

acetyl-CoA

Front 11

Under anaerobic conditions in muscle cells,pyruvate is converted to:

Back 11

lactate

Front 12

The production of triose phosphates in the first stage of glycolysis is an endothermic sequence of reactions.

Back 12

True

Front 13

The oxidative(aerobic) reactions of metabolism occure in the:

Back 13

mitochondria

Front 14

The direct precursor for the citric acid cycle is:

Back 14

acetyl-CoA

Front 15

One turn of the Kreb's cycle produces____ molecules of CO2.

Back 15

2 CO2

Front 16

The products of the tricarboxylic acid cycle are carbon dioxide and:

Back 16

3 NADH
1 FADH2
1 GTP

Front 17

The electron transport system (ETS) or respiratory chain is found dispersed in the mitocondrial matrix.

Back 17

False

Front 18

What metal ions present in the cytochromes of the ETS aid in the passage of electrons down the chain?

Back 18

Fe++ and Fe+++

Front 19

The final acceptor of electrons (H atoms) during respirations is:

Back 19

O2

Front 20

The formation of ATP in the ETS is called:

Back 20

oxidative phosphorylation

Front 21

It is possible to oxidize the hydrogen atoms of acetyl-SCoA without having oxidative phosphorylation occur.

Back 21

True

Front 22

The majority of the ATP produced during the catabolism of glucose is formed during:

Back 22

oxidative phosphorylation

Front 23

Glycogenolysis directly leads to the formation of glucose-6-phosphate which undergoes glycolysis.

Back 23

False
glycogenolysis--> gulcose-1-phosphate

Front 24

An important product of the pentose phosphate pathway (shunt)is:

Back 24

NADPH

Front 25

Another important product of the pentose shunt besides NADPH is :

Back 25

ribose-5-phosphate

Front 26

NADH is the coenzyme used in anabolism(synthesis).

Back 26

False
oxidation

Front 27

The protein complex which is responsible for respiration is imbedded in the inner mitochondrial membrane.

Back 27

True

Front 28

Before fats and oils can be metablized, fatty acids must be released from triglycerides with the aid of a triglyceride lipase.

Back 28

True

Front 29

The catabolism of fatty acids is called beta-oxidation.

Back 29

True

Front 30

The activator/carrier molecule used in fatty acid catabolism is:

Back 30

coenzyme-A, CoASH

Front 31

Complete beta-oxidation of a 12 carbon fatty acid produces ____ molecules of acetyl-CoA.

Back 31

6 acetyl-CoA

Front 32

Beta-oxidation occurs in the cytoplasm of a cell.

Back 32

False
occurs in mitochondria

Front 33

Fatty acid synthesis is the complete reverse of beta-oxidation.

Back 33

False

Front 34

The protein which is responsible for the transport of fatty acids through the inner mitochondirial membrane into the matrix is:

Back 34

carnitine

Front 35

The synthesis of a 12 carbon fatty acid is achieved by the sequential condensation of 6 acetyl-CoA molecules.

Back 35

False

Front 36

What coenzyme is the reducing agent used in fatty acid biosynthesis?

Back 36

NADPH

Front 37

The key intermediate in fatty acid synthesis is the free three carbon acid derivative, malonate.

Back 37

False

Front 38

Ketone bodies are formed when the concentration of aceytl-CoA in the mitochondria is very high.

Back 38

True

Front 39

In the cytoplasm, acetyl-CoA is used in the synthesis of non-saponifiable lipids.

Back 39

True

Front 40

The activator/carrier molecule used in fatty acid biosynthesis is:

Back 40

ACP

Front 41

Which of the following is a ketone body:
acetyl-CoA
acetone
acetaldehye
malonyl-CoA

Back 41

acetone

Front 42

The most important functions of aminoacids is for the synthesis of:

Back 42

Proteins

Front 43

Two key aminoacids in the catabolism of the amino group of amino acids are glutamate and ___________.

Back 43

aspartate

Front 44

Oxidative deamination of aminoacids directly produces:

Back 44

ammonium ion (NH4+)

Front 45

The direct "fuel" for the urea cycle is:

Back 45

carbamoyl phosphate

Front 46

The production of glutamate from alpha-ketoglutarate is called:

Back 46

transamination

Front 47

The molecule which reacts with carbamoyl phosphate at the start of the urea cycle is oxaloacetate.

Back 47

False

Front 48

The second amino group of urea is derived from aspartate.

Back 48

True

Front 49

Which of the following can NOT enter the glycolysis pathway?
glucose
fructose
galactose
glycogen

Back 49

glycogen

Front 50

What is the product of the endergonic stage of glycolysis?

Back 50

glyceraldehyde-3-phosphate

Front 51

Glyceraldehyde-3-phosphate and dihydroxyacetonephoshate are:

Back 51

trioses
functional isomers
monosaccharides

Front 52

Gluconeogenesis is the production of glucose from non-carbohydrate sources.

Back 52

True

Front 53

The synthesis of a 12-carbon fatty acid is achieved by the sequential condensation of 6 malonyl ACP

Back 53

True

Front 54

The key indermediate in fatty acid synthesis is the free three carbon diacid, malonate.

Back 54

False
malonyl-SCoA

Front 55

Ketone bodies are formed when the concentration of acetyl-CoA in the Cytoplasm is very high.

Back 55

False
mitochondria

Front 56

The molecule which reacts with carbonmoyl phosphate are the Start of the urea cylce is Aspartate.

Back 56

True