Practice Questions

Correct: Modern biology supports the sequence of chemical evolution leading to the first cells, followed by biological evolution. B: Not supported by scientific evidence. C: Spontaneous generation has been rejected. D: Cell theory explains existing cells, not the origin of life. Concept: Modern concept of the origin of life.

Correct: Anaerobic organisms indicate that free oxygen was absent initially. A: Contradicted by fossil evidence. C: Plants evolved much later. D: Prokaryotes evolved before eukaryotes. Concept: Evolutionary evidence.

Correct: The experiment supported only the chemical synthesis of organic molecules. A: It did not explain all stages. C: Spontaneous generation remains disproved. D: Amino acids were successfully synthesized. Concept: Experimental interpretation.

Correct: Internal stability is essential for metabolic reactions and survival. A: Stability is required before successful reproduction. C: Multicellularity evolved much later. D: Oxygen production is unrelated. Concept: Functional importance of membranes.

Correct: Organic monomers formed polymers, which became organized into protocells and eventually living cells. B, C, D: Incorrect sequence. Concept: Evolutionary sequence.

Correct: UV radiation, like lightning, supplied energy to drive prebiotic chemical reactions. A: Sterilization is not the objective. C: UV does not generate oxygen. D: The goal is synthesis, not destruction. Concept: Energy sources in chemical evolution.

Correct: Reducing gases favored the synthesis of organic compounds. A: Ozone developed later. C: Oxygen inhibits organic synthesis. D: Chlorofluorocarbons are modern pollutants. Concept: Primitive atmosphere.

Correct: Abiogenesis concerns the first origin of life, while biogenesis applies to present-day reproduction. A, C, D: These incorrectly define the two concepts. Concept: Abiogenesis versus biogenesis.

Correct: Early organisms likely consumed preformed organic molecules for energy. B: Oxygen was absent. C: Chlorophyll evolved later. D: Bacteria appeared long before multicellular life. Concept: First living organisms.

Correct: Amino acids polymerized to form proteins, which are essential for cellular structure and function. A: Cells require many additional components. C: Genetic material is DNA or RNA. D: Oxygen production began much later with photosynthetic organisms. Concept: Importance of amino acids in chemical evolution.