Formative Practice 2.1 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
State one structural difference between the rough endoplasmic reticulum and the smooth endoplasmic reticulum.

Rough endoplasmic reticulum has ribosomes attached it whereas smooth endoplasmic reticulum does not have any ribosomes attached to it.

Question 2:
Why is the use of an electron microscope important in studying cells?

Light microscope usually has a magnification of 1000x. On the other hand, the electron microscope is able to magnify a cell as much as 2000000x. Without an electron microscope, cell structures cannot be seen clearly because the light microscopes can only observe certain cell components, such as cell membrane, cell wall, nucleus, cytoplasm, and chloroplast only.

Question 3:
Chloroplast is found in some plant cells only. Give one example of a plant cell that does not have chloroplast and give your reasons.

Onion cell because onions grow in the ground. Onions obtain food from their storage organs which are onion bulbs.

Question 4:
Compare and contrast animal cells and plant cells.

Both cells have nucleus, cytoplasm, plasma membrane, Golgi apparatus, mitochondria, endoplasmic reticulums and ribosomes.

• Plant cells have a fixed cell shape whereas animal cells do not have.

• Plant cells have cell walls whereas animal cells do not.

• Plant cells have chloroplasts whereas animal cells do not.

• Plant cells have large vacuoles, whereas animal cells do not (if there is, the size is small).

• Plant cells do not have centrioles whereas animal cells do.

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