(100+ QUESTIONS AND ANSWERS) HESI A2 Biology v2 100 Questions and Answers )A+ GUARANTEE) 2023 UPDATED

Select the strand of DNA that would match this segment: ACTTGCA a. TGAACGT b. GACCATG c. ACTTGCA d. None of the above The correct answer is A. Purines must pair with pyrimidines in a specific way. A must pair with T; C must pair with G. So the complementary segment is TGAACGT. 25. DNA is stored in: a. The nucleus b. Ribosomes c. Endoplasmic reticulum d. Mitochondria The correct answer is A. Ribosomes produce proteins. The endoplasmic reticulum carries proteins to other parts of the cell. Mitochondria breaks down sugar to create energy. The nucleus stores the DNA and controls the cell. 26. Enzymes can _ reactions a. Catalyze b. Inhibit c. Stop d. None of the above The correct answer is A. Enzymes help to speed up reactions, not to inhibit or stop them. 27. Enzymes are typically _ _. a. Fats b. Proteins c. Sugars d. Neurons The correct answer is B. Enzymes are usually made of proteins, but a few can also be RNA. 28. Which of the following is not true about enzymes? a. They catalyze reactions b. They raise the activation energy needed c. They have an active site d. They are typically proteins The correct answer is B. Enzymes catalyze reactions, have an active site and are typically proteins. They also lower the activation energy needed for a reaction to occur, not raise it. 29. Epithelial cells are: a. Polarized b. Neutral c. Larger than other cells d. None of the above The correct answer is A. Epithelial cells have a top and bottom side, which shows that they are polarized. These sides (apical and basal) serve different purposes. 30. The apical side of an epithelial cell: a. Is exposed to fluid or air b. Is on the bottom side of the cell c. Does not allow any substances to pass through d. None of the above The correct answer is A. The apical side of an epithelial cell is the top side. This is the side that is either exposed to fluids or the air, or the inside of an organ. The bottom side of the cell is called the basal side. The apical side allows certain substances to pass through it. 31. Which of the following organisms would not have eukaryotic cells? a. Bacteria b. Dog c. Human d. Onion The correct answer is A. Dogs, humans and onions are all multi-cellular organisms which have eukaryotic cells. Bacteria are single-celled organisms that have prokaryotic cells. 32. Cells need to use exocytosis because: a. They need to get energy b. They need to protect against invaders c. They need to remove waste d. They need to divide The correct answer is C. Cells get energy through cellular respiration. Cells protect themselves with a cell membrane. Cells divide using cytokinesis. Exocytosis uses small vesicles to release either waste or substances for the body. 33. A child is sick. They have a body temperature that exceeds 37ºC. The body senses this and begins to sweat in order to lower the temperature. What is this an example of? a. Positive feedback loop b. Negative feedback loop c. Both d. None of the above The correct answer is B. A negative feedback loop works to return the body to homeostasis. In this example, the body identified a higher temperature, so it sent messages to the brain to signal for the body to sweat, which helps to cool the body and lower the temperature. 34. Homeostasis is necessary because a. It maintains temperature b. It maintains pH c. It maintains glucose levels d. All of the above The correct answer is D. Homeostasis is the tendency to resist change in order to maintain a stable, relatively constant internal environment. This includes maintaining temperature, pH levels and glucose levels. 35. A pencil measures 8cm long. What is this in mm? a. 80 mm b. 800 mm c. .8 mm d. .08 mm The correct answer is A. When changing from centimeters to millimeters, the decimal point moves one place value to the right. It takes 10 millimeters to make 1 centimeter, so it would take 80 millimeters to make 8 centimeters. 36. A scientist needs 12 mL of a solution. They have a bottle with 0.12L in it. Do they have enough? a. Yes, they have exactly what they need b. Yes, they have more than what they need c. No, they do not have enough d. None of the above The correct answer is B. 1 liter has 1000 milliliters in it. In order to convert from milliliters to liters, the decimal point would move three places to the left. So, the bottle has 120 mL of solution, a lot more than required 12 mL. 37. The purpose of the mitochondria is: a. Control the cell b. Create energy c. Create proteins d. Package waste for removal The correct answer is B. The nucleus controls the cell. The mitochondria create energy. The ribosomes create proteins and lysosomes package waste. 38. Which organelle is responsible for making proteins? a. Ribosome b. Chloroplast c. Lysosome d. Mitochondria The correct answer is A. The ribosomes create proteins. Chloroplasts convert sunlight to energy. Lysosomes package waste. The mitochondria create energy. 39. Which of the following is false? a. Animal cells use lysosomes to break down old cells b. Animal cells use chloroplasts to gain energy c. Plant cells have a cell wall to maintain structure d. All of the above are true The correct answer is B. Animal cells do not have chloroplasts since they cannot synthesize energy from sunlight. Only plants can do this.