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 Biochemistry exercises
 Comprehensive
Final exam for all Carbohydrate and Nitrogen lectures.
1. Which of the following molecules
CANNOT be excreted by the kidneys as glucuronides? 
A. 
Bile (stercobilin) 
B. 
Progesterone 
C. 
Bilirubin diglucuronide 
D. 
Morphine 
E. 
Thyroid hormone 
2. Which of the following molecules
DOES NOT
accumulate in blood
as a result of a defect in any of the enzymes of the urea cycle? 
A. 
Any of the intermediates of the urea cycle 
B. 
Ammonia in the form of NH4+ 
C. 
Glutamine and alanine 
D. 
All the intermediates of glycolysis 
3. Which of the following hormones regulates the excretion of both water and sodium counteracting the effects of other water homeostasis hormones? 
A. 
Aldosterone 
B. 
Antidiuretic hormone 
C. 
Cortisol 
D. 
Estrogen 
E. 
Natriuretic peptides 
4. Which of the following digestive enzymes pairs can break peptide bonds at either terminal end of a polypeptide? 
A. 
Trypsin&chymotrypsin 
B. 
Elastase&collagenase 
C. 
Aminopeptidase and carboxypeptidase 
D. 
Dipeptidase&tripeptidase 
E. 
Enterokinase and Phospholipase A 
5. Which of the following enzymes pairs can perform autocatalysis once they are activated? 
A. 
Pepsin&trypsin 
B. 
Aminopeptidase&carboxypeptidase 
C. 
Elastase&collagenase 
D. 
Dipeptidase&tripeptidase 
E. 
Chymotrypsin&Phospholipase A 
6. Which of the following zymogens can help in the screening of gastric disorders? 
A. 
Trypsinogen 
B. 
Pepsinogen 
C. 
Chymotrypsinogen 
D. 
Procollagenase 
E. 
Procarboxypeptidase 
7. Which of the following disorders can affect the release of pancreatic digestive enzymes into the intestinal lumen? 
A. 
Hartnup disease 
B. 
Cystinuria 
C. 
Cystic fibrosis 
D. 
Atrophic gastritis 
E. 
Duodenal ulcer 
8. Which of the following mechanisms facilitates the absorption and release of hydrophobic amino acids into the body's cells? 
A. 
Aquaporins 
B. 
Autophagosomes 
C. 
Secondary active transporters 
D. 
Simple diffusion 
E. 
Facilitated diffusion 
9. Which of the following statements about the degradation of body's proteins is
INCORRECT ? 
A. 
Proteins for degradation are recognized based on the presence of ubiquiting tags, PEST sequences, Nterminal or oxidized residues. 
B. 
A single ubiquitin isopeptide assigns a regulatory function to a protein but multiple ubiquitin isopeptides targets the protein for degradation. 
C. 
E1 binds and transfer an ubiqutin molecule to E2 and E3 joins the ubiquitin from E2 to the end terminal end of a target protein. 
D. 
Lysosomal proteases break down body' proteins into polypeptides; while, proteasome complexes break them into single amino acids. 
E. 
Binding of Nacetylglucosamine to the active sites of the proteasome inhibits protein degradation and the removal of this molecule facilitates protein degradation. 
10. Which of the following digestive enzymes pairs can break peptide bonds at either terminal end of a polypeptide? 
A. 
Trypsin&chymotrypsin 
B. 
Elastase&collagenase 
C. 
Aminopeptidase and carboxypeptidase 
D. 
Dipeptidase&tripeptidase 
E. 
Enterokinase and Phospholipase A 
11. Which of the following enzymes pairs need to be activated via autocatalysis? 
A. 
Pepsin&lysosomal proteases 
B. 
Aminopeptidase&carboxypeptidase 
C. 
Elastase&collagenase 
D. 
Dipeptidase&tripeptidase 
E. 
Chymotrypsin&Phospholipase A 
Questions & Answers
show that the set of all natural number form semi group under the composition of addition
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Dominic
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The denominator of a certain fraction is 9 more than the numerator. If 6 is added to both terms of the
fraction, the value of the fraction becomes 2/3. Find the original fraction.
2. The sum of the least and greatest of 3 consecutive integers is 60. What are the valu
1. x + 6 2
 = _
x + 9 + 6 3
x + 6 3
 x  (cross multiply)
x + 15 2
3(x + 6) = 2(x + 15)
3x + 18 = 2x + 30 (2x from both)
x + 18 = 30 (18 from both)
x = 12
Test:
12 + 6 18 2
 =  = 
12 + 9 + 6 27 3
Pawel
2.
(x) + (x + 2) = 60
2x + 2 = 60
2x = 58
x = 29
29, 30, & 31
Pawel
on number 2 question How did you got 2x +2
Ifeanyi
combine like terms. x + x + 2 is same as 2x + 2
Pawel
Q2
x+(x+2)+(x+4)=60
3x+6=60
3x+66=606
3x=54
3x/3=54/3
x=18
:. The numbers are 18,20 and 22
Naagmenkoma
Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 1 more than 3 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 113?
Mark = x,. Don = 3x + 1
x + 3x + 1 = 113
4x = 112, x = 28
Mark = 28, Don = 85, 28 + 85 = 113
Pawel
how do I set up the problem?
what is a solution set?
Harshika
find the subring of gaussian integers?
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hello, I am happy to help!
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corri
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1.What are complex number
2.How to solve complex number problems.
Beyan
yes i wantt to review
Mark
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Darius
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Seidu
may God blessed u for that.
Please I want u to help me in sets.
Opoku
x2y+3z=3
2xy+z=7
x+3yz=6
can you teacch how to solve that🙏
Mark
Solve for the first variable in one of the equations, then substitute the result into the other equation.
Point For:
(6111,4111,−411)(6111,4111,411)
Equation Form:
x=6111,y=4111,z=−411x=6111,y=4111,z=411
Brenna
(61/11,41/11,−4/11)
Brenna
x=61/11
y=41/11
z=−4/11
x=61/11
y=41/11
z=4/11
Brenna
Need help solving this problem (2/7)^2
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Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
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How do i figure this problem out.
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Need to simplify the expresin. 3/7 (x+y)1/7 (x1)=
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Source:
OpenStax, Biochemistry exercises. OpenStax CNX. Apr 06, 2016 Download for free at https://legacy.cnx.org/content/col11386/1.4
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