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Cytosine (and thymine) are pyrimidines. Adenine and guanine are purines. Hypoxanthine is a purine derivative, not a standard DNA base. DAT biology often tests purine vs pyrimidine classification.

Dalton’s law of partial pressures states total pressure = sum of partial pressures of gases. Each gas behaves independently. Boyle’s law relates P and V, Charles’s relates V and T, and Graham’s concerns diffusion. DAT chemistry often tests Dalton’s principle with gas mixtures.

The passage highlights plaque as a biofilm that requires physical disruption for control. Therefore, mechanical methods (toothbrushing and flossing) directly address plaque removal. Option A (reducing protein) is unrelated. Option B (fluoride) strengthens enamel and aids remineralization but does not directly remove plaque. Option D (antibiotics) may affect bacteria but is not a recommended or practical daily control method. On DAT RC, the best answer aligns explicitly with what the passage states, not with outside knowledge.

Secondary alcohols oxidize to ketones regardless of oxidizing strength. PCC stops primary alcohols at aldehydes, but with secondary alcohols, the product is always a ketone. Carboxylic acids require a primary alcohol with strong oxidizers. DAT organic chemistry frequently tests alcohol oxidation pathways.

Chloroplasts, containing chlorophyll, carry out photosynthesis by converting light energy into glucose. Mitochondria (A) perform respiration. Ribosomes (C) synthesize proteins, while lysosomes (D) digest cellular waste. On the DAT, chloroplasts and mitochondria are often compared as energy-transforming organelles with their own DNA.