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Atomic radius increases down a group and decreases across a period. Among the alkali metals listed, Rb (bottom of group) has the largest radius. Option B (K) and C (Na) are smaller, while Li is the smallest. Periodic trend mastery is frequently tested on DAT general chemistry.

The Golgi apparatus modifies proteins (e.g., glycosylation), sorts them, and packages them into vesicles for secretion. Ribosomes (A) synthesize proteins, the nucleus (B) houses DNA, and lysosomes (D) degrade macromolecules. On the DAT, recall: ER = synthesis, Golgi = modification and packaging.

The iodoform test detects methyl ketones (–COCH₃) or ethanol. Ethanol (B) oxidizes to acetaldehyde, which gives a positive test. Acetone (C) is a methyl ketone and also positive. Methanol (A) lacks the required structure. Thus B and C give positive results. Recognizing functional group tests is common on the DAT organic section.

The Krebs cycle starts with acetyl-CoA, not pyruvate. Per acetyl-CoA, the cycle generates 3 NADH, 1 FADH₂, and 1 ATP (or GTP), plus 2 CO₂. Pyruvate is an upstream glycolysis product, converted to acetyl-CoA by pyruvate dehydrogenase. Thus D is not a product. Understanding energy yields is critical on the DAT: each glucose gives 2 pyruvate → 2 acetyl-CoA → double the Krebs output.

Work ∝ workers × time. 8 × 12 = 96 worker-days. For 6 days: 96 ÷ 6 = 16 workers. Option C is correct. DAT QR frequently uses work-rate problems solved with proportion.