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‫نموذج عام المتحانات االحياء العامة‬
Q-1) Select the ONE choice that BEST answers the question.
1. Which of following structures found in both plant cells and animal
cells?
a. cell walls
c. chloroplasts
e. none of the above
b.
d.
central vacuoles
mitochondria
2. Which of the following categories best describes the function of the
rough endoplasmic reticulum?
a.
c.
e.
breakdown of complex foods
membrane factory
information storage
b.
d.
energy processing
structural support of cells
3. Which of these organelles modify sort and ship products?
a.
c.
e.
Smooth endoplasmicreticulum
Golgi apparatus
Rough endoplasmic reticulum
b.
d.
Ribosomes
Nucleolus
4. The main component of the primary plant cell wall is:
a.
c.
e.
Pectin
Lignin
Cutine
b.
d.
Cellulose
Chitin
5. All of the following characterize microtubules EXCEPT:
a.
b.
c.
d.
e.
They are made of the protein tubulin.
They are involved in providing motility.
They are support and maintain the cell shape.
They develop from the plasma membrane.
They make up the spindle apparatus observed during cell division.
6. Dye injected into a plant cell might be able to enter an adjacent cell
through a:
a.
c.
e.
Cell membrane
cell wall
gap junction
b.
d.
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microtubule
plasmodesmata
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7. Active site is a term most closely associated with
a. an enzyme substrate
b. an end product
c. noncompetitive inhibitors
d. environmental factors
8. Which of the following molecules is not common to RNA and ATP?
a.
b.
ribose
nitrogenous base
c. deoxyribose
d. phosphate group
9. Which of the following can affect the rate of an enzyme-catalyzed
reaction?
a. Temperature
b. pH
c. competitive and noncompetitive inhibitors
d. All of above
10. Which structure encompasses (‫ )يشمل‬all the others?
a. organ
b. cell
c. molecule
d. organelle
e. tissues
11. DNA contains how many different kinds of bases, or nucleotides?
a. 1
b. 2
c. 3
d. 4
e. 5
12. Which of the following cells is not surrounded by cell wall?
a. Fungi
b. Algae
c. Bacteria
d. Animal
e. none of the above
13. Genetic information flows from
a. RNA to DNA to protein
b. protein to RNA to DNA
c. DNA to protein to DNA
d. DNA to RNA to protein
e. none of above
14. Human sex hormones are classified as
a. proteins
b. lipids
c. amino acids
d. triglycerides
e. carbohydrates
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15. Which of the following statements about glucose is not true?
a.
b.
c.
d.
e.
The major nutrient for the cell
Hexose sugar
The structural unit of maltose, starch, glycogen and cellulose
Pentose sugar
none of above
16. Non polar covalent bonds form when:
a.
c.
e.
Electrons shared equally
The electronegativity of atoms are identical
None of the above
b. The two atoms sharing electrons are identical
d. All of the above
17. The organelle most directly responsible for modifying protein for
the formation of secretory proteins is?
a. centrioles
b. mitochondria
c. Golgi bodies
d.
e.
f.
microbodies
Rough Endoplasmic reticulum
C and e
18. All of the following occur in cyclic photophosphorylation EXCEPT,
A.
B.
C.
D.
E.
Electrons move along an electron transport chain.
Electrons in chlorophyll become excited.
ATP is produced.
Light energy is absorbed.
NADPH is produced.
19. All of the following are true about photosynthesis EXCEPT,
A.
B.
C.
D.
E.
The Calvin-Benson cycle usually occurs in the dark.
The majority of the light reactions occur on the thylakoid membranes in the chloroplast.
Light energy is stored in ATP.
A proton gradient drives the formation of ATP from ADP + Pi.
Glucose (or another 6-carbon sugar) is made during the photosynthetic process.
Q-2) Fill in the blanks
1. Plant cells are connected by channels called-----------------------------while channels between animal cells called----------------------------------2. The mature plants cell wall composed from three layers.
A-------------------------B-------------------------C --------------------3
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3. Competitive inhibitor binds to -------------------------------- while
Non-competitive inhibitor binds to-------------------------------------4. In a plant cell, DNA is located in:
a. ------------------b. ------------------c. -------------------
5. The two strands of DNA holding together by -----------------------------
between the nitrogenous bases.
6. DNA (chromatin) is folded around a number of proteins to form. --------
Q-3) State whether are true or false and correct the false
1) (
) Cows and some bacteria have enzymes that can digest cellulose:
---------------------------------------------------------------------------------------2) ( ) Chitin is a polysaccharide composes the plant cell wall:
---------------------------------------------------------------------------------------3) ( ) Fats are polymers composed from 3 molecules of fatty acids and one glycerol:
---------------------------------------------------------------------------------------4) ( ) The main function of microtubules is the muscle contraction
---------------------------------------------------------------------------------5) ( ) In the cisternal space of Golgi apparatus, lipids are attached to proteins to
form glycoproteins.
-----------------------------------------------------------------------------------------6) ( ) Phosphate bonds of ATP molecule are considered as high energy and as
strong bonds.
---------------------------------------------------------------------------------7) ( ) A DNA strand is a polymer of amino acids.
--------------------------------------------------------------------------------------11)
Type of protein
One Example
Structural proteins
1- ---------------------------------------------------------
1
2
------------------------- Hemoglobin
3
------------------------- Actin
4
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Q-4) Match the numbers in A and in B:
A
1
2
3
4
5
6
7
8
Active site
Plant oils
lysosome
Triacylglycerol
Rough Endoplasmic reticulum
Competitive inhibitor
Chloroplast and mitochondria
Cofactors
energy transformers
fat
unsaturated fats
non protein helpers
bind to active site
saturated fats
membrane factory
containing hydrolytic enzymes
catalytic center
B
1
2
3
4
5
Noncyclic
photophosphorylation
Light reactions
Photolysis of H2O
Calvin-Benson cycle
C4 photosynthesis
A mode of photosynthesis that involves movement of
substances between mesophyll cells and bundle sheath cells
The ultimate step is the production of one molecule of glucose
Releases oxygen
Occurs in the membrane of thylakoid
The finale step storing energy into NADPH
Good Luck
Dr. Abboud Elkichaoui
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