Mention the exact location of the following:
Centrioles:
Topic: Centrioles
Try it
Pick an option and check your answer. The full worked answer is below either way.
Answer
(c) Found only in animal cells.
CENTRIOLES are found ONLY IN ANIMAL CELLS — a pair of cylindrical structures lying in the CYTOPLASM near the nuclear envelope, not inside the nucleus.
Option (b) is eliminated by position: they are cytoplasmic, not nuclear. Options (a) and (d) are eliminated by the fact that higher plant cells have none at all.
WHAT FOLLOWS FROM THEIR ABSENCE IN PLANTS: without centrioles a plant cell forms NO ASTER during division, though it still builds a spindle. That links directly to Question 5(i) of this same paper.
Keep the three similar words apart, since the paper uses all of them: CENTRIOLE — the cylindrical structures in the cytoplasm CENTROSOME — the organelle containing them CENTROMERE — the point joining two chromatids ON a chromosome
Found only in animal cells.