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Biochemistry 232 Final Exam



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Choose one of the best answer for each question from the following:



 1- Acid has properties as following:

A-     Sour taste and change the shape of certain vegetable dyes

B-      Sour taste and change the colure of certain vegetable dyes

C-      Sugar taste and change the colure of certain vegetable dyes

D-      Sugar taste and change the shape of certain vegetable dyes



2- The pH of Cola and Tomato juice is:

A-     Acid

B-      Base

C-      Neutral

D-      Non of the above



3- Base is any substance when it dissolves in water give:

A-     OH- or hydroxide ion

B-      H+ or hydrogen ion

C-      OH- and hydrogen ion

D-      H+ and hydroxide ion



4- There are 20 amino acids share common structural features:

A-     They are a-amino acids

B-      They have a carboxyl group and an amino group

C-      They differ from each other in R groups

D-      All the above



5- The AA in proteins are:

A-     D-stereoisomer

B-      C-stereoisomer

C-      L-stereoisomer

D-      F-stereoisomer



       6- Phenylalanine, Asparagine and Aspartate respectively have the abbreviation:

A-     P, D and K

B- P, D and E

C- P, D and R

D-F, N and D



7- Peptide is:

A-     Two or more AA covalently joined by peptide bonds

B-      Two or more AA hydrogen joined by peptide bonds

C-      Two or more AA ionic joined by peptide bonds

D-      Two or more AA covalently joined by hydrogen bonds




8- Secondary structure in protein mean:

A-     Amino Acids residues

B-      Polypeptide chain

C-      a-Helix

D-      Assembled subunits



9- Three chromatographic methods used in protein purification:

A-     Ion-exchange, anion exchange and affinity

B-      Ion-exchange, cation exchange and affinity

C-      Ion-exchange, size-exclusion and affinity

D-      Ion-exchange, size-exclusion and anion exchange.



10- Direction migration in electrophoresis is:

A-     Negative to positive

B-      Positive to negative

C-      A and B

D-      Non of the above



11- Amino acid sequence of human cytochrome has:

A-     100 AA

B-      102 AA

C-      104 AA

D-      95 AA



12- Nucleotides have a characteristic components:

A-     A nitrogen base

B-      A pentose

C-      A phosphate

D-      All the above



     13- The bases structure in DNA which have pyrimidine:

A-     A and G

B-      T and C

C-      A and C

D-      T and G



 14- There are two hydrogen bond in DNA between:

A-     A and T

B-      C and G

C-      A and C

D-      T and G



15- The molecule without the phosphate group in nucleic acid is called:

A-     Nucleotide

B-      Nucleoside

C-      Dexoyribonucleotide

D-      Ribonucleotide



16- Sucrose which is common table sugar contains:

A-     Glucose and galactose

B-      Glucose and glucose

C-      Glucose and fructose

D-      Galactose and fructose



17- Glycogen and cellulose are examples of :

A-     Oligosaccharides

B-      Monosaccharide

C-      Disaccharides

D-       Non of the above



18- Vitamin C  function as :

A-     An antioxidant involved in many redox reactions

B-      Blood-clotting process regulator

C-      Regulator of neuronal signals

D-      non of the above .



19- Triglycerides are formed by:

A-     Three fatty acids

B-      Two fatty acids attached and a phosphate group

C-      Three saturated fatty acids

D-      Three fatty acids attached to a glycerol backbone


20- Addition and removal of water is a function of :

A-     Kinase enzymes

B-      Ligases and restriction enzymes

C-      Dehydrogenases

D-      Hydrases and Hydrolases



Answer any Eight (8) questions from the Nine (9) questions in the following:



1)      What are the three major chemical bond with brief explanation for each one?



2)      Define the amino acid and draw 5 structure of AA with full name and the abbreviation?



3)      Define the protein and give example for a protein with 4 AA?



4)      What is nucleotide and give the structure of purines?



5)      Explain the four types of enzyme specificity and draw the basic enzymes reaction diagram



6)      What are the types of blood lipids with brief description of each type



7)      Define hormones and what is the difference between the endocrine and exocrine systems in the body?


8)      What are the three classes of carbohydrates with definitions of each class and give an example with structure of at least one of the three classes?


9)      What are the basics of water soluble vitamins


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