Question

Without this molecule, cellular respiration does not happen, because it is the final electron acceptor. What is it?

		O2
		water
		FADH2
		CO2 Yeasts are single-celled eukaryotes that don't have a mitochondrion. Can they exist in an environment without oxygen? Yes, yeasts can exist in an oxygen-poor environment. They will only be able to produce 2 net ATP via fermentation, but the absence of oxygen will not kill the organisms. No, the presence of oxygen will kill yeast because they will not be able to undergo fermentation. Sugar is "quick energy" because provides energy to the cell directly, whereas carbohydrates like starch must be broken down before the body can utilize the energy. True False Deciduous trees have leaves that typically change color in the autumn. This is due to the fact that chlorophyll is reabsorbed into the tree, but leaves the carotenoids, which appear yellow and orange to the human eye. True False

Answer 1

Answer 1

The 1^st option (O₂) is correct.

The O₂ molecule is the final electron acceptor in aerobic respiration, where it takes and converts into water molecule by binding to Hydrogen ions.

Answer 2

Yeasts are able to do anaerobic respiration. Therefore, they can survive in no oxygen environment. Therefore, 1^st option is correct.

Answer 3

It is true; here we are talking about sugars like glucose and fructose. They directly take step in glycolysis. Therefore, these sugars rapidly provide energy. Disaccharides and polysaccharides need to break down in glucose, fructose, or other monosaccharides.

Answer 4

It is true. These plants reabsorb chlorophylls before the autumn. These plants need to save energy after the fallings of leaves. The absorbed chlorophyll molecules further break down to gain energy. On the other hand, the leaves have already carotenoids, which remain in the leaves. Therefore, these leaves appear yellow or orange.

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