I- multiple choice questions
1- When two molecules of glucose combine, they form
a) maltose b) sucrose c) fructose d) ribose
2- Smallest carbohydrates are trioses , which of the following is trioses :
a). glucose b). ribose c). glyceraldehydes d). arabinose .
3- Which of the following monosaccharides is not an aldose?
a). ribose b). glucose c). fructose d). glyceraldehyde
4- what is the main product for the following reaction :
5- What are the monosaccharide components of sucrose?
a). Fructose & Galactose b). Fructose & Glucose c). 2 Fructose d). Glucose & Galactose
6- What is the principal carbohydrate storage product in plants?
a). Glucose b). Cellulose c). Starch d). Glycogen
7- Starch and glycogen are both polymers of:
a). α-D-glucose. b). β-D-glucose. c). glucose-1-phosphate. d).. sucrose.
8- A polysaccharide which is often called animal starch is
a). Glycogen b). Starch c) chitin d). Dextrin
9- How is glucose stored in animals?
a). As dextrose in pancreas b). As protein & cellulite in adipose tissue
c). As cellulose in thighs & abdominal cavity d).As glycogen in liver & muscles
10- The optically inactive amino acid is
(a) Glycine (b) Serine (c) Threonine (d) Valine
11- Isoelectric pH of an amino acid is that pH at which it has a
(a) Positive charge (b) Negative charge (c) No net charge (d) All of these
12- …………….. amino acids which can’t be formed in the body
a). Semi essential b). Essential c). Non-essential d). derived.
13- The linkage in is …….. linkage
a). ether b). ester c). amide d- phosphate ester
14- What stabilizes the tertiary structure of a protein?
a). -helices b). -sheets c). Primary structure d). Hydrophobic interactions
15- this amino acid is ……….amino acid
a). polar b). nonpolar c). acid. d). base .
16- Which of the following is a zwitterion?
17- What is the protein found in human hair, finger nails, and enamel of teeth
a). Keratin b). Cellulite c). Collagen d). Glycogen
18- The linear sequence of amino acids within a protein is an example
of __________ protein structure.
a). quaternary b). secondary c). primary d). tertiary
19- …….. is a unique sequence of amino acids and the location of the disulfide bridges.
a). Primary Structure b). secondary Structure c). Tertiary Structure d).none of them.
20- It is a spiral structure resulting from hydrogen bonding between one peptide bond and
the fourth one
a). α-helix. B). β-Pleated Sheet c). tertiary structure d). all of them.
21- alpha keratin is a ……
a). Fibrous proteins b). Globular Proteins c). Conjugated d).none of them.
22- Hemoglobin is a globular protein with ……. polypeptide.
(A) four (B) three (C) two (D) none of the above
II- match the following biochemical ( column A ) with their corresponding
item ( column B )
BIOCHEMICAL FUNCTION
No.
COLUMN A COLUMN B
1 Epimers (a) carries O2, CO2 and H+ in the blood
2 Denaturation (b) Molecule that consists of 2 glucose molecules covalently bonded
(c) Stereoisomers that differ only in configuration about one
3 Myoglobin
chiral center.
(d) physical or chemical process that changes the protein structure and
4 Maltose
makes it incapable of performing its normal function
5 Hemoglobin (e) Storage form of glucose in plants
6 Lactose (f) structural component of plant cell walls
7 starch
8 Cellulose
III- Short notes questions :
1- Write down the types of carbohydrates with an example of each.
2- explain how glycogen is stored, and what its function is.
3- cellulose is one of the most important glucans, give some examples of its application.
4- What is the difference between Hemoglobin and Myoglobin?
5- Proteins can be classified into 3 main types. Mention them with examples of each type.
6- Amino acids are linked together through “peptide bonds” forming peptides and proteins.
what’s the difference between peptides and proteins?
7- Tertiary Structure of protein is stabilized by 4 factors mention them.
IV- classify the following monoscharides and Identify each as the D or L isomer:
V- Classify each of the following amino acid (polar, non-polar, acidic, or
basic):
