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In ethene, each carbon is double-bonded to the other and single-bonded to two hydrogens. This involves 3 electron domains → sp² hybridization. Geometry is trigonal planar (120°). sp occurs in triple bonds, sp³ in single bonds. DAT organic chemistry often tests hybridization and bond angles.

Nuclear pores are protein complexes embedded in the nuclear envelope that control transport of RNA and proteins between the nucleus and cytoplasm. Ribosomes (B) synthesize proteins, centrioles (C) organize microtubules, and the nucleolus (D) assembles ribosomal subunits. On the DAT, nucleus function questions emphasize transport control through nuclear pores.

Regardless of size, any cube has 8 corner cubes, each with 3 painted faces. Thus Option C is correct. DAT PAT cube-counting requires recognizing invariant corner counts.

Type AB individuals have both A and B antigens and no antibodies against either, making them universal recipients. Type O is the universal donor. DAT biology emphasizes ABO and Rh compatibility rules.

There are exactly 11 valid nets of a cube. A net consisting of six squares in a straight line (Option C) cannot fold into a cube because the squares at the far ends cannot meet or overlap correctly—there is no way to form the closed three-dimensional structure. Options A, B, and D are among the valid nets and can be folded into a cube. PAT (Perceptual Ability Test) requires visualization of 3D folding from 2D layouts. Remembering that only 11 cube nets exist helps eliminate invalid options quickly. Strategy: check whether the pattern allows opposite faces to be placed correctly; if not, it cannot fold to a cube.