Which of these components of a cell functions like the bones and muscles in the human body?
a. chloroplasts
b. ribosomes
c. cytoskeleton
d. cytoplasm

The answer is C.

The cytoskeleton in plants is responsible for cell shape, cell motility (movement) , and also motility of organelles within the cell.

The cytoskeleton connects to every organelle and every part of the cell membrane. The cytoskeleton in is a bit different from the human skeleton in that it is very dynamic meaning it can change shape, shorten or lengthen.

This dynamic nature is necessary for cells to change shape, complete cell division and migrate from place to another.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

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