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Cellular Energy Questions


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Cellular Energy Questions

Postby flower555 » Mon Nov 29, 2010 2:05 am

2. The oxidation of wood (fire) and the oxidation of glucose (respiration) are basically the
same exergonic reaction. However the amount of heat released by fire would destroy a
cell. Explain how a cell manages to harvest the energy stored in glucose and still
maintain internal temperatures conducive to life. (5)

3. To efficiently manage metabolism, cells need to precisely coordinate and regulate a
complex web of chemical reactions.

a.) Explain why cells need to efficiently manage metabolic pathways and why it is an
evolutionary advantage to do so. (3)

b.) Feedback inhibition is a common regulatory mechanism. Describe what feedback
inhibition is and explain why it is an efficient system for regulating biochemical
pathways. (2)

4. ATP is the “energy currency” of the cell.

a.) Explain why ATP functions well in this role. (2)

b.) Explain why ATP is only good for short-term energy storage. (2)

c.) Explain what a cell uses for longer term energy storage and explain why. (2)

5. Acetyl-CoA is a key molecule in both oxidative cellular respiration and the synthesis of
fat (and other large molecules). Explain how the cell can regulate its metabolism if the
same molecule is used in both energy production and biosynthesis? (5)

6. Scientists consider glycolysis to be one of the earliest biochemical processes to evolve
in the first living cells. Describe the evidence that supports this. (5)

7. It is often said that the enzyme ATP synthase works like a water wheel turbine. Explain
the details of this analogy — what flows, what turns, and what work is done? (5)

8. Why do we breathe in oxygen and why do we die when we can’t? (5)

9. In 2005, 29 children died in the Philippines from cyanide poisoning by eating
improperly prepared cassava desserts sold at a local fair. In 1945, Adolph Hitler
committed suicide by ingesting cyanide salts. Explain how cyanide functions as a
metabolic poison. Be specific! (5)

10. In biological systems, structure and function are related and membranes are
important structural features of cells.

a). Describe the specific role of membrane structure in the synthesis of ATP in either
cellular respiration or photosynthesis. (3)

b.) Describe the structure of a mitochondria and a chloroplast. Explain in detail how the
structure of these organelles is important to their functions.(3)

11. Compare the overall process of cellular respiration and photosynthesis with regard to
their redox reactions. Be specific.(6)

12. Sunlight can be called “the ultimate fuel source for all
communities on Earth”.

a.) What type of energy is sunlight? (1)

b.)What is wavelength, ?, a measure of? What are the units?
c.) What colors of light does the chlorophyll a pigment
absorb? What colors of light does chlorophyll b absorb and
reflect? What colors of light do the carotenoids absorb and
reflect? (2)

d.) Why do plants look green? (1)

e.) Describe the significance of the graph at the right.
13.What happens when a chlorophyll molecule absorbs a photon of light? Compare
isolated chlorophyll with chlorophyll in a chloroplast. What is fluorescence? (4)
14.Compare/contrast PSI and PSII. How are they similar? different? (4)
15.What is the limitation of C3 plants in hot, dry areas? What is photorespiration? For
both a C3 and a C4 plant, trace the path of a carbon dioxide molecule from the point at
which it enters a plant to its incorporation into a glucose molecule. Include leaf anatomy
and biochemical pathways in your discussion of each type of plant. (6)
16.The rate of photosynthesis may very with changes that occur in environmental
temperature, wavelength of light, and light intensity. Using a photosynthetic organism of
your choice, choose only ONE of the three variables (temperature, wavelength of light, or
light intensity) and for this variable
a.Design a scientific experiment to determine the effect of the variable on the rate of
photosynthesis for the organism; (2)

b.Explain how you would measure the rate of photosynthesis in your experiment;
c.Describe the results you would expect. Explain why you would expect those results.
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Postby Tranc3r » Mon Nov 29, 2010 2:16 am

ya, umm, your teacher clearly states that she only wants you to do online research and you should only ask for help from classmates your teacher, not us. ... lar-Energy
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Postby JackBean » Mon Nov 29, 2010 6:18 am

LOL, you must be crazy, flower! RTFM!
Last edited by canalon on Mon Nov 29, 2010 4:37 pm, edited 1 time in total.
Reason: Let us not be obviously rude. Acronyms will be used.

Cis or trans? That's what matters.
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