TEST BANK FOR BIOLOGY 2E BY OPENSTAX BY MARY ANN, JUNG CHOI, MATTHEW DOUGLAS COMPLETE 2026

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,Chapter 1: The Science of Life xx xx xx x xx




1. Which characteristic is common to all living organisms?
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A. Ability to move voluntarily xx xx xx



B. Presence of a nucleus xx xx xx



C. Ability to reproduce xx xx



D. Presence of chloroplasts xx xx




Answer: C. Ability to reproduce xx xx xx xx



Rationale: All living organisms share fundamental characteristics, including
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repr oduction, metabolism, growth, and response to stimuli. While not all
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organisms ha ve a nucleus (prokaryotes lack one) or chloroplasts, reproduction
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is universal.
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2. Which level of biological organization is correctly arranged from simplest
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to most complex?
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A. Organ → Cell → Tissue → Organ System
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B. Cell → Tissue → Organ → Organ System
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C. Tissue → Cell → Organ → Organ System
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D. Organism → Organ System → Organ → Tissue xx xx xx xx xx xx xx




Answer: B. Cell → Tissue → Organ → Organ System
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Rationale: Biological organization progresses from simple to complex: cells
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form tissues, tissues form organs, organs work in organ systems, and organ
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systems fu nction in organisms.
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3. Homeostasis is best described as: xx xx xx xx



A. The ability to produce energy
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B. Maintaining a stable internal environment xx xx xx xx



C. The process of evolution xx xx xx



D. The creation of new speciesxx xx xx xx




Answer: B. Maintaining a stable internal environment
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Rationale: Homeostasis is the regulation of internal conditions such as
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temperatu re, pH, and fluid balance, despite changes in the external
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environment.
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,4. The primary molecule for storing genetic information is:
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A. Carbohydrates
B. Lipids
C. DNA
D. Proteins
Answer: C. DNA xx xx



Rationale: DNA (deoxyribonucleic acid) contains hereditary information that gui
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des growth, development, and reproduction in all living organisms.
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5. Evolution explains: xx



A. How individual organisms adapt during their lifetime
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B. How populations change over generations
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C. The immediate response of an organism to stimuli
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D. The process of cellular respiration
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Answer: B. How populations change over generations
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Rationale: Evolution is the process bywhich populations of organisms change
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genetic ally over time due to natural selection, mutation, and other mechanisms.
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6. Which of the following is a prokaryotic organism?
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A. Amoeba
B. Bacterium
C. Algae
D. Yeast
Answer: B. Bacterium xx xx



Rationale: Prokaryotic cells lack a nucleus and membrane-
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bound organelles, which is characteristic of bacteria. Amoebas, algae, and yeast
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ar e eukaryotic.
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7. Which of the following best illustrates an emergent property?
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A. Chlorophyll in plants absorbing sunlight xx xx xx xx



B. Water molecules forming liquid
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, C. Heart pumping blood as part of the circulatory system
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D. DNA replication xx




Answer: C. Heart pumping blood as part of the circulatory system
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Rationale: Emergent properties arise when individual components interact to
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form a system with new functions. The heart alone cannot pump blood until
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organized i nto a system.
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8. Which scientific method step involves forming a testable statement?
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A. Observation
B. Hypothesis
C. Experiment
D. Conclusion
Answer: B. Hypothesis xx xx



Rationale: A hypothesis is a testable statement predicting a relationship between varia
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bles, based on prior observations.
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9. Which of these is an example of adaptation?
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A. A plant wilting due to lack of water
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B. Polar bears having thick fur in Arctic regions
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C. A human learning to swim
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D. Bacteria dying from antibiotics xx xx xx




Answer: B. Polar bears having thick fur in Arctic regions
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Rationale: Adaptations are inherited traits that increase survival and reproduction
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in specific environments.
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10. The process bywhich organisms maintain internal conditions despite
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external changes is called:
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A. Photosynthesis
B. Homeostasis
C. Metabolism
D. Evolution