The correct answer is C) There is not enough oxygen in the culture medium. This is because of alcoholic fermentation, and anaerobic process where the yeast transform sugar (glucose) in ethylic alcohol (ethanol) and carbon dioxide. Glucose is decomposed into pyruvic acid which then after turns into CO2 and ethanol. The bubbles described, are produced by the carbon dioxide.
The yeast, as well as some bacteria, use the glucose molecule through "glycolysis" to obtain a 3-carbon molecule called pyruvates. Glycolysis consists of 10 coupled reactions, in the end, from one glucose (6 carbons) the yeast will obtain two pyruvates (3 carbons each).
Pyruvate can follow three main routes to obtain ATP, end up as lactate, as carbon dioxide (CO2) and water or as ethanol (alcohol) and CO2. Regarding yeast, it can only be used to obtain Ethanol plus CO2 or to obtain CO2 plus water.
The path that follows from here depends on the reaction medium. The cell gets much more energy (38 molecules of ATP) by converting pyruvate into water + CO2 than by turning it into ethanol + CO2 (2 molecules of ATP). Then, whenever possible, the yeast will follow the CO2 + water path. To support this route the cell needs oxygen. In this case, the cell obtains its energy by breathing when there is no oxygen available, the yeast has a way that allows it to gain much less energy but allows it to survive, the alcoholic fermentation, previously mentioned.
Therefore, A, B, and D answers are wrong for the reasons mentioned above.
Answer:
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Answer:
a.Feeding on conifers evolved earlier than feeding on angiosperms. Feeding on conifers evolved earlier than feeding on angiosperms.
c.Diversification of the angiosperms may have led to diversification of herbivorous beetles. Diversification of the angiosperms may have led to diversification of herbivorous beetles.
Explanation:
Biological evolution corresponds to the process of modification and adaptation of species over time. The current diversity of living beings is the result of processes of transformation and adaptation of species to different environments, constituting biological evolution. This can be seen in various spheres of biological life on our planet, and in the case of beetles and plants mentioned in the question above, the evolution of species richness and herbivorous beetles can develop the following information:
- Feeding on conifers evolved earlier than feeding on angiosperms.
- Diversification of the angiosperms may have led to diversification of herbivorous beetles.
molten rocck near ground water supplies
A reflex action is a way for the body to automatically and rapidly respond to a stimulus to minimise any further damage to the body.
