BIOLOGY I EXAM #1 - PRACTICE QUESTIONS COMPLETE WITH 100% VERIFIED ANSWERS

BIOLOGY I EXAM #1 - PRACTICE QUESTIONS COMPLETE WITH 100% VERIFIED ANSWERS 1. What is the first step of the scientific method? A) Hypothesis B) Experiment C) Observation D) Conclusion Correct Answer: C) Observation Rationale: The scientific method begins with observation, which is the act of viewing the world around us. This initial step leads to questions and subsequent hypothesis formation. ________________________________________ 2. A tentative explanation for an observation is called a: A) Theory B) Hypothesis C) Prediction D) Conclusion Correct Answer: B) Hypothesis Rationale: A hypothesis is defined as a tentative explanation for an observation. It is not yet a theory, which requires extensive support over time. ________________________________________ 3. In a controlled experiment, which group is NOT exposed to the variable? A) Test group B) Experimental group C) Control group D) Variable group Correct Answer: C) Control group Rationale: The control group is not exposed to the variable in an experiment. This allows researchers to compare results with the test group to determine if the variable had an effect. ________________________________________ 4. On which axis is the independent variable found on a graph? A) Y-axis B) Z-axis C) X-axis D) Both X and Y axes Correct Answer: C) X-axis Rationale: The independent variable (the manipulation performed on the test group) is plotted on the x-axis of a graph, while the dependent variable is plotted on the y-axis. ________________________________________ 5. Which of the following is an example of a dependent variable? A) Hours of tutoring B) Amount of fertilizer C) Test score D) Temperature setting Correct Answer: C) Test score Rationale: The dependent variable is the effect being measured. In this example, test score is the outcome being measured based on the independent variable (hours of tutoring). ________________________________________ 6. The theory of evolution is considered the single most important theory in biology because: A) It explains the origin of life B) There is extensive evidence from multiple scientific fields C) It was proposed by Charles Darwin D) It disproves all other biological theories Correct Answer: B) There is extensive evidence from multiple scientific fields Rationale: The theory of evolution has overwhelming evidence from anatomy, fossil records, biogeography, and molecular biology, making it the central unifying theory in biology. ________________________________________ 7. Which of the following is NOT a characteristic of living organisms? A) Organization B) Ability to reproduce C) Ability to evolve D) Constant temperature regardless of environment Correct Answer: D) Constant temperature regardless of environment Rationale: While homeostasis involves maintaining a stable internal environment, organisms do NOT maintain constant temperature regardless of the environment. They regulate conditions within a range but are affected by environmental changes. ________________________________________ 8. The first law of thermodynamics states that: A) Energy is constantly increasing in the universe B) Energy can be created and destroyed C) Energy can neither be created nor destroyed D) Entropy always decreases Correct Answer: C) Energy can neither be created nor destroyed Rationale: The first law of thermodynamics states that energy can be transformed from one form to another but cannot be created or destroyed. ________________________________________ 9. How does the first law of thermodynamics apply to living organisms? A) Organisms create energy from nothing B) Organisms transform energy from sunlight into chemical energy C) Organisms destroy energy during metabolism D) Organisms do not follow thermodynamic laws Correct Answer: B) Organisms transform energy from sunlight into chemical energy Rationale: Living organisms transform energy (e.g., sunlight to chemical energy) and cells convert energy by expending it, giving off heat as a byproduct. Energy is never created or destroyed, only transformed. ________________________________________ 10. Entropy can be best described as: A) The amount of energy in a system B) The amount of disorder in a system C) The temperature of a system D) The organization of molecules Correct Answer: B) The amount of disorder in a system Rationale: Entropy is the measure of disorder in a system. The second law of thermodynamics states that entropy in the universe is constantly increasing. ________________________________________ 11. According to the second law of thermodynamics, which of the following is true? A) Entropy in the universe is constantly decreasing B) Entropy in the universe is constantly increasing C) Entropy remains constant in the universe D) Entropy only changes in living systems Correct Answer: B) Entropy in the universe is constantly increasing Rationale: The second law of thermodynamics states that the amount of entropy (disorder) in the universe is constantly increasing. ________________________________________ 12. How does temperature affect entropy? A) Higher temperature decreases entropy B) Higher temperature increases entropy C) Temperature has no effect on entropy D) Lower temperature increases entropy