PLANT STRUCTURE QUIZ

If the ends of the following polysaccharide are pulled, which one would stretch the most?

Starch

Cellulose

None of these

Glycogen

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Why do some redox reactions in cells result in the transfer of electrons from a reductant with a higher standard redox potential to an oxidant with a lower standard redox potential?

Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions

The rules governing oxidation and reduction apply only in vitro, and not in vivo

Electrons always go from reductants with high redox potentials to oxidants with low redox potentials

None of these

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Which of the following functional groups would make a carbon-based compound the least polar?

Methyl

Phosphate

Amino

Carboxyl

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Water content of active protoplasm is

40%

10%

90%

70%

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Which of the following elements is likely to form the least polar covalent bond with hydrogen?

Carbon

Phosphorus

Nitrogen

Oxygen

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Cellular metabolism is an example of

a series of reactions occurring under standard conditions

equilibrium metabolism

a series of reactions that defy the second law of thermodynamics

steady-state metabolism

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If complex III were incorporated into an artificial lipid vesicle in order to demonstrate it's proton translocating ability in isolation, which of the following would be an appropriate electron donor?

Cytochrome c peroxidase

Cytochrome c oxidase

Cytochrome c red

Ubiquinol (UQH2)

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Which of the following experimental results does not support Mitchell's chemiosmosis theory?

Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis

Electron transport in isolated mitochondria was shown to result in acidification of the medium

An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport

Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium

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Tonoplast is a membrane around

mitochondria

nucleus

vacuole

cytoplasm

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Which of the following can be found as a part of the mitochondrial matrix?

Ribosomes

Enzymes

All of these

DNA

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