This quiz works best with JavaScript enabled. Home > Science > Biology > Biology – Quiz 30 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Biology Quiz 30 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The ozone layer is damaged by A) CFCs. B) Increase in greenhouse gases. C) Increased global temperatures. D) Sulfuric and nitric acids. Show Answer Correct Answer: A) CFCs. 2. Enzymes are capable of increasing the rate of a chemical reaction within a living cell. Enzymes accomplish this through which of the following means? A) Reducing the number of products. B) Reducing the activation energy. C) Increasing the temperature of the cell. D) Increasing the concentration of reactants. Show Answer Correct Answer: B) Reducing the activation energy. 3. Which of the following is not involved in causing a plant shoot to bend towards unidirectional light? A) Cell division. B) The shoot tip. C) Cell elongation. D) Auxin. Show Answer Correct Answer: A) Cell division. 4. Muscular tube that connects the mouth to the stomach A) Epiglottis. B) Peristalsis. C) Stomach. D) Esophagus. Show Answer Correct Answer: D) Esophagus. 5. What is a potential consequence of the rise in global temperatures on the Arctic ecosystem? A) Decreased success of pest species. B) Increased exposure to UV light. C) Increase in the ice habitat available to polar bears. D) Increased rate of decomposition of detritus. Show Answer Correct Answer: D) Increased rate of decomposition of detritus. 6. The basic unit of life is called a (n) A) Atom. B) Compound. C) Cell. D) Energy. Show Answer Correct Answer: C) Cell. 7. Which factor most affects the order of amino acids in a protein? A) The DNA located in the nucleus of the cell. B) The cell in which the protein is located. C) The amount of ATP available for the cell's use. D) The area in a cell where proteins are produced. Show Answer Correct Answer: A) The DNA located in the nucleus of the cell. 8. ..... means to use something again. A) Reduce. B) Reuse. C) Recycle. D) None of above. Show Answer Correct Answer: B) Reuse. 9. Which of the following are roles of the hepatic portal vein? I. carries nutrient-rich blood to the liver from the intestineII. prevents glucose from entering the general circulation immediatelyIII. supplies the liver with oxygenated blood for aerobic respiration A) I and II only. B) I and III only. C) II and III only. D) I, II and III. Show Answer Correct Answer: A) I and II only. 10. What is found in dark places, the bottom of the Oceans, in Ravines, and other places without Sunlight? A) Heterotrophs. B) Photoautotrophs. C) Chemoautotrophs. D) Reece Jacob. Show Answer Correct Answer: C) Chemoautotrophs. 11. The main function of chloroplasts is: A) To control what enters and leaves the cell. B) To break down food to release energy for the cell. C) To control all activities of the cell. D) To produce food for the cell using the sun's energy. Show Answer Correct Answer: D) To produce food for the cell using the sun's energy. 12. This part of the alimentary canal is called sight of complete digestion A) Stomach. B) Small intestine. C) Large intestine. D) Mouth. Show Answer Correct Answer: B) Small intestine. 13. Which would most likely produce a mutation that is passed on to offspring? A) Radiation changing the DNA sequence in skin cells. B) A gamete with an extra chromosome forming. C) Tobacco smoke altering the genes in lung cells. D) Exposure to chemicals altering nerve cell function. Show Answer Correct Answer: B) A gamete with an extra chromosome forming. 14. Which system is used for naming species? A) Binomial. B) Conservation. C) Dichotomous. D) Natural selection. Show Answer Correct Answer: A) Binomial. 15. What is the correct order to make a protein? A) Protein, DNA, RNA. B) RNA, DNA, Protein. C) DNA, RNA, Protein. D) Protein, RNA, DNA. Show Answer Correct Answer: C) DNA, RNA, Protein. 16. Why is it important for the cell wall to loosen during cell elongation? A) To activate proton pumps. B) To allow active transport of water. C) To allow auxin to be released. D) To allow osmosis to occur. Show Answer Correct Answer: D) To allow osmosis to occur. 17. The weight of all living things within an environment or habitat is referred to as ..... A) Biomass. B) Energy. C) Rule of 10s. D) Organisms. Show Answer Correct Answer: A) Biomass. 18. Which sequence of complementary DNA bases would pair with this partial strandATG TGA CAG? A) ATG TGA CAG. B) TAC ACT GTC. C) GTA AGT GAC. D) CAT TCA CTG. Show Answer Correct Answer: B) TAC ACT GTC. 19. Absorbs nutrients in the digestive tract A) Columnar. B) Cuboidal. C) Simple Squamous. D) Pseudostratified. Show Answer Correct Answer: A) Columnar. 20. In what form is carbohydrate usually transported in the phloem tissue? A) Glucose. B) Maltose. C) Starch. D) Sucrose. Show Answer Correct Answer: D) Sucrose. ← PreviousNext →Related QuizzesScience QuizzesBiology Quiz 1Biology Quiz 2Biology Quiz 3Biology Quiz 4Biology Quiz 5Biology Quiz 6Biology Quiz 7Biology Quiz 8Biology Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books