Ascientist is observing onion cells and human cheek cells under a microscope. which observation does she most likely make? the onion cells have lysosomes, and the cheek cells do not. the cheek cells have larger vacuoles than the onion cells. the cheek cells have a nucleus, and the onion cells do not. the onion cells have a cell wall, and the cheek cells do not.

The correct answer is option (D) the onion cells have a cell wall, and the cheek cells do not.

Onion cell is a classic example of a plant cell and a cheek cell is an example of an animal cell. Plant cells and animal cells differ in various characteristic features. The important features which differ are-

1. Plant cells are made up of a cell wall in addition to a cell membrane and animal cells lack cell wall.

2. Plant cells have large vacuoles but animal cells either lack vacuoles or have a few smaller ones.

3. Plant cells lack the cell organelles called the lysosomes which are found in animal cells.

4. Plant cells have the characteristic plastids and animal cells lack them.

Thus, the scientist makes an observation that the onion cells have a cell wall made up of cellulose since they are plant cells, and the cheek cells do not.

D

Explanation:

The onion cells have a cell wall, and the cheek cells do not.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.