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1 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. 1 microtubule plasmodesmata 2 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 2 3 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 4 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 5 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 5