NBS Chemistry Enzymes and Hormones

Question 1

Most enzymes are:
A. Cholesterol
B. Proteins
C. Carbohydrates
D. Fatty acids

Answer 1

Proteins

Question 2

Which of the following is the rate limiting step for the krebs cycle?
A. Carnitine Acyltransferase 1
B. Acetyl CoA carboxylase
C. Isocitrate Dehydrogenase
D. Glucose 6- phosphate dehydrogenase

Answer 2

C

Isocitrate CoA carboxylase

Question 3

Which of the following is the rate limiting step for the Fatty acid synthesis?
A. Carnitine Acyltransferase 1
B. Acetyl CoA carboxylase
C. Isocitrate Dehydrogenase
D. Glucose 6- phosphate dehydrogenase

Answer 3

B

Acetyl CoA Carboxylase

Question 4

Which of the following is the rate limiting step for the Beta oxidation?
A. Carnitine Acyltransferase 1
B. Acetyl CoA carboxylase
C. Isocitrate Dehydrogenase
D. Glucose 6- phosphate dehydrogenase

Answer 4

A

Carnitine Acyltransferase 1

Question 5

Which of the following is the rate limiting step for the Urea cycle?
A. Carnitine Acyltransferase 1
B. Carbamoyl phosphate synthetase 1
C. Isocitrate Dehydrogenase
D. Glucose 6- phosphate dehydrogenase

Answer 5

B

Carbomoyl Phosphate synthetase 1

Question 6

Which of the following is the rate limiting step for the HMP Shunt?
A. Carnitine Acyltransferase 1
B. Acetyl CoA carboxylase
C. Isocitrate Dehydrogenase
D. Glucose 6- phosphate dehydrogenase

Answer 6

D

Glucose 6- phosphate dehydrogenase

Question 7

How many actions can an enzyme influence at once?
A. unlimited
B. 3
C. 1
D. 2

Answer 7

1

only one at a time

Question 8

T/F: Anabolic reactions require energy

Answer 8

True

Question 9

T/F: Catabolic reactions build up molecules

Answer 9

False

Catabolic break things down

Question 10

Would the result of a catabolic reaction generate or lose energy?

Answer 10

generate

Question 11

An enzyme + Cofactor=
A. Polyenzyme
B. Haloenzyme
C. Apoenzyme

Answer 11

Haloenzyme

Question 12

An enzyme without a cofactor is called a _________?

Answer 12

Apoenzyme

Question 13

During enzyme regulation, steroids help to regulate the rate of enzymatic degradation or synthesis?

Answer 13

Synthesis

Question 14

A zygomen is a protein that becomes an active enzyme when parts are _______?
A. Added
B. Removed

Answer 14

Removed

Question 15

Do substrates usually inhibit or stimulate a reaction?

Answer 15

Stimulate

Question 16

Do Products usually inhibit a reaction or stimulate a reaction?

Answer 16

Inhibit

Question 17

An area on the enzyme where a compound may bind and change the rate of activity is called a _________ site?

Answer 17

allosteric site

Question 18

Michaelis-Menten constant (Km) is the concentration of substrate at which an enzyme yields:
A. 1/1 Vmax
B. 1/2 Vmax
C. 2/3 Vmax
D. 1/4 Vmax

Answer 18

1/2 Vmax

Question 19

Kinase transfers a ________ usually from an _____?

Answer 19

Phosphate, ATP

Question 20

Oxidoreductase moves _________?

Answer 20

hydrogen

Question 21

NAD breaks molecules and NADH ______ molecules?

Answer 21

Builds

Question 22

What amino acid formed epinephrine?

Answer 22

Tyrosine

Question 23

Insulin comes from the __________of ___________ and is made by beta cells.

Answer 23

Islets of Langerhans

Question 24

This peptide hormone is secreted from the tail of the pancreas?

Answer 24

Insulin

Question 25

This peptide hormone is secreted from alpha cells within the pancreas?

Answer 25

glucagon

Question 26

Insulin inhibits which of the following: A. Aldosterone B. Hormone sensitiev lipase C. Kinase

Answer 26

hormone sensitive lipase

Question 27

``` What is the derivative of steroids? A. Fatty acids B. Peptides C. Cholesterol D. Carbohydrates ```

Answer 27

Cholesterol

Question 28

Aldosterone is an example of: A. Gonadocorticoids B. Mineralcorticoids C. Glucocorticoids

Answer 28

Mineralcorticoids ALDOSTERONE IS SALTY about it

Question 29

Cortisol is an example of: A. Gonadocorticoids B. Mineralcorticoids C. Glucocorticoids

Answer 29

Glucocorticoids Cortisol is a Sweetie pie

Question 30

Estrogen and testosterone are an examples of: A. Gonadocorticoids B. Mineralcorticoids C. Glucocorticoids

Answer 30

Gonadocorticoids SEX

Question 31

``` What is the initial substrate for testosterone synthesis? A. Long chain Fatty Acids B. Free Cholesterol C. Proteins D. Hormone sensitive lipase ```

Answer 31

Free Cholesterol

Question 32

Which of the following would increase gluconeogenesis: A. Gonadocorticoids B. Mineralcorticoids C. Glucocorticoids

Answer 32

Glucocorticoids