19. which statement regarding autotrophs A. Autotrophs always perform photosynth

Question

19. which statement regarding autotrophs A. Autotrophs always perform photosynthesis to synthesize organic molecules. B. Autotrophs can produce organic compounds from inorganic compounds without having to consume other living organisms C. The stacks of thylakoids found in the chloroplast are known autotrophs. D. Autotrophs cannot synthesize organic compounds from as materials a instead obtain them by consuming inorganic E. other autotrophs or heterotrophs. Autotrophs reside in the stroma. 20. As you walk to your classes, your musce cells are typically conducting A. glycolysis, Krebs cycle, oxidative phosphorylation, fermentation B. Krebs cycle, pyruvate metabolism, oxidative phosphorylation, fermentation C. pyruvate metabolism, Kreb cycle, oxidative phosphorylation, fermentation D. glycolysis, pyruvate metabolism, oxidative phosphorylation, fermentation E. glycolysis, pyruvate metabolism, Krebs cycle, oxidative phosphorylation Part II. INTERPRETIVE PROBLEMS. Answer all parts of each question for full credit in the space provided on ANSWER HEET. points noted for each question Use the following information to answer questions #21-22. point each) Exposing inner membranes to ultrasonic vibrations will disrupt the that membranes. However, the fragments will reseal "inside out." These little vesicles result can still transfer electrons from NADH to oxygen and synthesize ATP. If the membranes are agitated still further however, the ability to synthesize ATP is lost. 21. the first disruption, when electron transfer and ATP synthesize still occur, what be must present? as ATP synthase A. all of the electron transport proteins as well groups B. all of the electron transport system and the ability to add CoA to acetyl the ATP synthase system is sufficient D. the electron transport system is sufficient for respiration E. plasma membranes like those bacteria use 22. After the second agitation of the membrane vesicles, what must be lost from the membrane? the first acceptor in the electron transport A. the ability of NADH to transfer electrons to chain the transport system B. the prosthetic groups like heme from C cytochromes D. ATP synthase, in whole or in part and outer membrane surfaces E. the contact required between inner

Explanation / Answer

1. correct answer is 'C'

Explanation:During the Z scheme of electron transfer from oxygen evolving complex to the PS II to PS I, the Cytochrome b6f is intermediate between both complexes. This electron is finally used by ferrodoxin NADP+ oxidoreductase complex to reduce NADP+ to NADPH + H+. However, cyclic electron flow which involves only PS I is when the elctrons are sent back to Cyt b6f which generates a proton gradient across the thylakoid membrane in order to synthesize more ATP than NAPDH. thus, gives ratio ATP:NADPH=3:2

2. 'D'

Explanation: Red and yellow wont be absorbed as these pigment colors reflect these light wavelengths.

3. A. sugar is oxidized and O2 is reduced.

4. B during II & III. during conversion of pyruvate into acetyl CoA by the pyruvate dehydrogenase complex, CO2 molecule is released along with NADH + H+ and during Kreb's cycle, in the step of conversion of isocitrate to aplha ketoglutarate and from alpha ketoglutarate to succinyl CoA, CO2 molecule is released along with NADH + H+

5: D

Explanation:example of this is: Glu + Pi = Glu-6-PO4 has delta G= +13.8kJ.

when coupled with ATP + H2O= ADP + Pi   having delta G= -30.5kJ. the common intermediate is 'Pi'. thus overall Delta G= -30.5 +13.8= -16.7kJ becomes favorable.

6. -

7. B.

Explanation:
it involves thermodynamics law of entropy which is also called as the scientific arrow of time and entropy is defined as the random disorder of a system.

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