3. A) If the electron transport chain failed to work, why would chemiosmosis not occur? B) Your friend asks you “Why do we breathe in oxygen?” Based on what we learned in class and metabolism, how would you answer your friend's question? C) Your friend asks you "Why do we breathe out carbon dioxide?” Based on what we learned in class and metabolism, how would you answer your friend's question?

Some friends are trying to make wine in their basement. They've added yeast (which is a facultative anaerobe - it can perform both aerobic respiration and fermentation) to a sweet grape juice mixture and have allowed the yeast to grow. After several days they find that sugar levels in the grape juice have dropped, but there's no alcohol in the mixture. The most likely explanation is that     the mixture needs less oxygen, because yeast only produce alcohol in the absence of oxygen   the mixture needs less sugar, because high sugar concentrations prevent fermentation   the mixture needs more sugar, because yeast need a lot of energy before they can begin to produce alcohol   the yeast used the alcohol as a carbon source   the mixture needs more oxygen, because yeast need oxygen to break down sugar and get enough energy to produce alcohol

Which of the following are required to completely metabolize glucose into carbon dioxides and water? a) Carrier proteins in the inner mitochondrial membrane b) Vitamin B1 c) Both a and b d) Neither a nor b

the compound produced by the Calvin Benson cycle that so important to the maintenance of life on earth is a) water b) carbon dioxide c) oxygen d) glucose 2. cellular respiration refers to a) the diffusion of oxygen into the cells b) breathing  c) the transfer of O2 and CO2 across a cell membrane Carbon dioxide is to the Calvin Benson cycle is  a) oxaloacetic acid is to the electron transport system  b) pyruvic acid is to glycolysis  c) ATP is the electron transport system  d) acetyl co-enzyme A is to the Kreb's cycle  most of the atp produced in cellular respiration is associated with the a) formation of pyruvic acid b) krebs cycle c) formation of water d) production of alcohol  Both NAD and FAD are compounds derived from the B vitamins niacin and flavin. Which of the following would most likely be a symptom of a person whose diet is deficient in these vitamins. a) increase production of carbon dioxide b) a lack of energy c) increase production of water d) decrease oxygen production