Matching cell functions to structural appearances in animal cells Steps:

• Function 1 involves ribosomes for mRNA translation; match to non-membrane-bound spherical structure (X).
• Function 2 is lipid synthesis by smooth endoplasmic reticulum; match to membrane-bound structure with enclosed cavity (V).
• Function 3 requires centrioles to form spindle fibers; match to non-membrane-bound cylindrical structure (Y).
• Verify choice D pairs 1-X, 2-V, 3-Y correctly.

Why D is correct:

• It aligns each function with the defining appearance: ribosomes (spherical, non-membrane-bound), smooth ER (membranous cavity), centrioles (cylindrical, non-membrane-bound).

Why the others are wrong:

• A: Matches 1 to V (membranous, not ribosomal) and 2 to W (spherical, not for lipids).
• B: Matches 2 to W (spherical, not lipid-synthesizing) and 3 to V (membranous, not centriolar).
• C: Lacks complete matching for function 3.

Final answer: D