COC EXAM | Biology & Health Section | freshman coc jimma university | JU |AMU|WSU|WCU|DBU|DU скачать в хорошем качестве

COC EXAM | Biology & Health Section | freshman coc jimma university | JU |AMU|WSU|WCU|DBU|DU

I have provided four plausible choices and identified the correct answer based on the source text and general health science knowledge.Biology & Health Science Section1. What is the final electron acceptor in aerobic respiration? 1A. $O_{2}$ 2B. Water 3C. $CO_{2}$ 4D. Plastocyanin 5Answer: A 62. Which of these provides high energy during the Krebs cycle? 7A. NADH 8B. $FADH_{2}$ 9C. Both A and B 10D. Substrate level phosphorylation 11Answer: C 123. What is a common result of hypokalemia (low potassium)? 13A. Alkalosis 14B. Acidosis 15C. Salinity 16D. None 17Answer: A 184. Where is Vitamin B12 absorbed in the digestive tract? 19A. Jejunum 20B. Stomach 21C. Ileum 22D. Large intestine 23Answer: C 245. What is the final stage in the development of a human embryo? 25A. Spermatogenesis 26B. Fertilization 27C. Organogenesis 28D. Placenta formation 29Answer: C 306. Why are enzymes considered "specific"? 31A. They work at any temperature.B. Their active site fits only one substrate.C. They are made of carbohydrates.D. They are used up in reactions.Answer: B7. What is the primary function of B lymphocytes? 32A. To carry oxygen.B. To produce antibodies.C. To clot blood.D. To digest food.Answer: B8. Which is the most abundant immunoglobulin in the body? 33A. IgG 34B. IgA 35C. IgE 36D. IgM 37Answer: A 389. Which disease can be reduced by eating oranges? 39A. Beriberi 40B. Scurvy 41C. Night blindness 42D. None 43Answer: B 4410. Which food increases Vitamin A concentration in the body? 45A. White breadB. CarrotsC. Sugary sodaD. Polished riceAnswer: B11. Which cells in the body increase the immune response? 46A. Red blood cellsB. PlateletsC. White blood cellsD. Nerve cellsAnswer: C12. What are substances that prevent enzyme activity called? 47A. CatalystsB. InhibitorsC. SubstratesD. Co-enzymesAnswer: B13. What is the main function of the cell membrane? 48Getty ImagesA. Energy productionB. Controlling entry/exit of substancesC. Protein synthesisD. Genetic storageAnswer: B14. Which of these diseases is caused by protozoa? 49A. Leishmaniasis 50B. Diarrhea 51C. Typhus 52D. None 53Answer: A 5415. What is the biological cause of Malaria? 55A. Plasmodium 56B. Female Anopheles Mosquito 57C. Virus 58D. Bacteria 59Answer: A 6016. What type of pathogen is COVID-19? 61A. Virus 62B. Bacterial 63C. Protozoa 64D. Fungus 65Answer: A 6617. What is the structural difference between cellulose and chitin? 67A. Cellulose contains nitrogen; Chitin does not.B. Chitin contains nitrogen; Cellulose does not.C. Both are made of protein.D. Cellulose is found in animals.Answer: B18. Which of the following is an enzyme? 68A. Cellulase 69B. Cellulose 70C. Glucose 71D. Sucrose 72Answer: A 7319. What are the polysaccharides in bacterial and fungal cells called? 74A. Cellulose 75B. Dexter 76C. Murein 77D. Chitin 78Answer: C (for Bacteria) or D (for Fungi) 7920. What are polysaccharides made from identical monomers called? 80A. Heteroglycans 81B. Polymers 82C. Homoglycans 83D. Macromolecules 84Answer: C 8521. What is a similarity between simple and facilitated diffusion? 86A. Both require ATP.B. Both move against a gradient.C. Both are passive (no energy needed).D. Both require carrier proteins.Answer: C22. How do oxygen levels compare between deserts and dense cities? 87A. Deserts have more oxygen.B. Densely populated areas have more oxygen.C. They are exactly the same.D. Oxygen is absent in deserts.Answer: A (due to higher air purity/less pollution in remote areas)23. Who survives hunger longer: one who eats carbs or one who eats meat? 88A. The carbohydrate eater.B. The meat eater.C. Neither.D. Both survive equally.Answer: B (Proteins and fats in meat provide more sustained energy)24. Which enzyme is responsible for reducing Nitrogen? 89A. AmylaseB. NitrogenaseC. PepsinD. LipaseAnswer: B25. What substances form a chemical buffer system? 90A. Strong acid and strong baseB. Weak acid and its conjugate baseC. Pure water and saltD. Metal and non-metalAnswer: B26. What is the difference between pH and pOH? 91A. pH measures acidity; pOH measures alkalinity.B. pH measures oxygen; pOH measures hydrogen.C. There is no difference.D. pH is for solids; pOH is for gases.Answer: A27. Which of the following are natural polymers? 92A. Plastic and NylonB. Proteins and DNAC. PVC and TeflonD. Polyester and RayonAnswer: B28. After four boys, what is the probability of the fifth child being a girl? 93A. 25% 94B. 50% 95C. 75% 96D. 100% 97Answer: B 9829. Which parents could have a child with blood group O? 99A. AO and BO 100B. O and O 101C. AB and BO 102D. AB and AO 103Answer: A or B 10430. Which blood vessel has the highest blood pressure? 105A. Venules 106B. Vena cava 107C. Arterioles 108D. Aorta 109Answer: D 110