Question

Explain the variation in the shape and sizes of cells, with examples

Answer 1

the regulation of growth rates or by actively sensing size and coupling this signal to cell division. We focus this review on potential size-sensing mechanisms, including geometric, external cue, and titration mechanisms. Mechanisms that titrate proteins against DNA are of particular interest because they are consistent with the robust correlation of DNA content and cell size. We review the literature, which suggests that titration mechanisms may underlie cell-size sensing in Xenopus embryos, budding yeast, and Escherichia coli, whereas alternative mechanisms may function in fission yeast.

Answer 2

Hey user, here is your answer...
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Explain the variation in the shape and sizes of cells with examples.

▶Cell Shape:-

➡The shape of cells differ not only in different organisms, but also in different organs of the same organism.

➡They maybe oval, spherical, cuboidal fibre- like or polygonal.

➡These shapes are influenced by their location and function in the tissue.

➡For Instance:- A nerve cell has to transmit nerve impulses to organs located in different parts of the body.

➡Hence, they possess a long fibre- like structure.

▶Cell Size:-

➡Cells vary in size.

➡The smallest cell PPLO (Pleuro Pneumonia- like organism) also called mycoplasma is about 0.1 micron ( denoted as 'μ') in diameter (1μ =${10}^{ - 6}$m) .

➡The ostrich egg is considered to be the largest cell with 170 mm in diameter.

➡The hen's egg also represents a single cell that is big enough to be seen with the naked eye.
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