Which of the following statements about the cells of plants and animals is true? 1 They are similar in many ways structurally and functionally. 2 Unlike animal cells, all plant cells are always...

Which of the following statements about the cells of plants and animals is true? 1 They are similar in many ways structurally and functionally. 2 Unlike animal cells, all plant cells are always green in colour. 3 Only animal cells have ribosomes, plants do not make proteins. 4 Plant cells need oxygen only at night whereas animal cells always need oxygen.    

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megamind-616 | Middle School Teacher | (Level 1) Associate Educator

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Number 1, that plant and animals cells are similar structurally and functionally in many ways, is the true statement out of the four options. 

Below are explanations for why the other three responses are incorrect:

2. Unlike animal cells, all plant cells are always green in color.

Although the green pigment known as chlorophyll is the most common pigment housed in chloroplasts of plant cells, it is not the only plant pigment. For example, xanthophylls are yellow and carotenoids are orange pigments. In the fall, chlorophyll breaks down due to the colder temperatures. At that time, the pigments are are present in lower quantities can be seen. This is why the leaves change color during the fall. 

3. Only animal cells contain ribosomes, plant cells do not make proteins. 

Plant and animal cells are eukaryotic cells. All eukaryotic cells contain ribosomes. Proteins are imperative for the structure of all cell parts, and are produced by these ribosomes. 

4. Plant cells need oxygen only at night whereas animal cells always need oxygen. 

All eukaryotic cells contain mitochondria. Oxygen is needed for cellular respiration which occurs in the mitochondria. During cellular respiration, oxygen and glucose (a sugar) are used to make carbon dioxide, water, and a form of energy known as ATP. This process doesn't cease overnight, since many bodily functions still require energy to continue. 

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