square hierarchical groups are used? A) Kingdom and sne and family spec square 17. Which of the followi acts as a cell ular post office? A) Endopla smic g organelle ratus C) Ribc some D) Lysosome 18.w ich of the following diseas e is not sexuall y transmitted? square A) Diarrh ea B) Syphilis ea D)H IIV (AIDS) square 19. Which cha ckest walls? A rightatri m B) Left ven ricles C) Left atrium entricle 20. Which of the follow ing endocri ne glands secretes a hormone that directly affects the metabolic rate of the body? A) Thyroid B) Ovary C) Pi tuitary D) Pancreas square 21. The mutatio that results in the change of a triplet (G AG) in a normal heme globin to another triplet (GTG) in sick le-cellhemoglobin is: A) Insertion mutation B)Deletion m utation C)Substitut ion mutat ionD)Non -disjunction square 22. The ability of ca rnivores to survive in an ecosys tem is depenc ent on the availability of prey. This can be consider ed as A) C atastrophic factor B) Ab iotic factor C) Edaphi c factor D)Biotic factor square 23. Whic h nitrogen bas e is not f ound in RNA? A) Guanine B)Uracil C)Thymine D)Adenine square 24. Which one of the fo llowing cells is formed a s a result of meiosis? A) Skin cell B) Blood cell C)Musc le cell D) Egg cell 25. Which on of the following organic m olecules h as ester bounds in its molecul ar structure? square A) Tri glyceride B) Glycogen C) Amino acid D)Cellulose

Let's go through each question and provide the correct answers:<br /><br />17. Which of the following organelle has a role in protein synthesis?<br />A) Endoplasmic reticulum<br />B) Golgi apparatus<br />C) Ribosome<br /><br />Answer: C) Ribosome<br /><br />18. Which of the following diseases is not transmitted?<br />A) Diarrhea<br />B) Syphilis<br />C) HIV/AIDS<br /><br />Answer: A) Diarrhea<br /><br />19. Which chamber of the heart has the thickest walls?<br />A) Right atrium<br />B) Left atrium<br />C) Right ventricle<br />D) Left ventricle<br /><br />Answer: D) Left ventricle<br /><br />20. Which of the following endocrine glands hormone directly affects the metabolic rate of the body?<br />A) Thyroid<br />B) Ovary<br />C) Pituitary<br />D) Pancreas<br /><br />Answer: A) Thyroid<br /><br />21. The type of gene mutation that results in the change of a triplet (GAG) in a normal hemoglobin to another triplet (GTG) in sickle-cell hemoglobin is:<br />A) Insertion mutation<br />B) Deletion mutation<br />C) Substitution mutation<br />D) Non-disjunction<br /><br />Answer: C) Substitution mutation<br /><br />22. The ability of carnivores to survive in an ecosystem is dependent on the availability of prey. This can be considered as:<br />A) Catastrophic factor<br />B) Abiotic factor<br />C) Edaphic factor<br />D) Biotic factor<br /><br />Answer: D) Biotic factor<br /><br />23. Which nitrogen base is not found in RNA?<br />A) Guanine<br />B) Uracil<br />C) Thymine<br />D) Adenine<br /><br />Answer: C) Thymine<br /><br />24. Which one of the following cells is formed as a result of meiosis?<br />A) Skin cell<br />B) Blood cell<br />C) Muscle cell<br />D) Egg cell<br /><br />Answer: D) Egg cell<br /><br />25. Which one of the following organic molecules has ester bonds in its molecular structure?<br />A) Triglyceride<br />B) Glycogen<br />C) Amino acid<br />D) Cellulose<br /><br />Answer: A) Triglyceride