NBS Chemistry Enzymes and Hormones Flashcards
Most enzymes are: A. Cholesterol B. Proteins C. Carbohydrates D. Fatty acids
Proteins
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
C
Isocitrate CoA carboxylase
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
B
Acetyl CoA Carboxylase
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
A
Carnitine Acyltransferase 1
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
B
Carbomoyl Phosphate synthetase 1
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
D
Glucose 6- phosphate dehydrogenase
How many actions can an enzyme influence at once? A. unlimited B. 3 C. 1 D. 2
1
only one at a time
T/F: Anabolic reactions require energy
True
T/F: Catabolic reactions build up molecules
False
Catabolic break things down
Would the result of a catabolic reaction generate or lose energy?
generate
An enzyme + Cofactor=
A. Polyenzyme
B. Haloenzyme
C. Apoenzyme
Haloenzyme
An enzyme without a cofactor is called a _________?
Apoenzyme
During enzyme regulation, steroids help to regulate the rate of enzymatic degradation or synthesis?
Synthesis
A zygomen is a protein that becomes an active enzyme when parts are _______?
A. Added
B. Removed
Removed
Do substrates usually inhibit or stimulate a reaction?
Stimulate
Do Products usually inhibit a reaction or stimulate a reaction?
Inhibit
An area on the enzyme where a compound may bind and change the rate of activity is called a _________ site?
allosteric site
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
1/2 Vmax
Kinase transfers a ________ usually from an _____?
Phosphate, ATP
Oxidoreductase moves _________?
hydrogen
NAD breaks molecules and NADH ______ molecules?
Builds
What amino acid formed epinephrine?
Tyrosine
Insulin comes from the __________of ___________ and is made by beta cells.
Islets of Langerhans
This peptide hormone is secreted from the tail of the pancreas?
Insulin
This peptide hormone is secreted from alpha cells within the pancreas?
glucagon
Insulin inhibits which of the following:
A. Aldosterone
B. Hormone sensitiev lipase
C. Kinase
hormone sensitive lipase
What is the derivative of steroids? A. Fatty acids B. Peptides C. Cholesterol D. Carbohydrates
Cholesterol
Aldosterone is an example of:
A. Gonadocorticoids
B. Mineralcorticoids
C. Glucocorticoids
Mineralcorticoids
ALDOSTERONE IS SALTY about it
Cortisol is an example of:
A. Gonadocorticoids
B. Mineralcorticoids
C. Glucocorticoids
Glucocorticoids
Cortisol is a Sweetie pie
Estrogen and testosterone are an examples of:
A. Gonadocorticoids
B. Mineralcorticoids
C. Glucocorticoids
Gonadocorticoids
SEX
What is the initial substrate for testosterone synthesis? A. Long chain Fatty Acids B. Free Cholesterol C. Proteins D. Hormone sensitive lipase
Free Cholesterol
Which of the following would increase gluconeogenesis:
A. Gonadocorticoids
B. Mineralcorticoids
C. Glucocorticoids
Glucocorticoids
