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Science questions......need help!
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| Dj Fred Lamar |
Whats up TAs. just got a take home test and needed alittle help w/ some of the questions? Thansk in advance for any replies.
1.Which of the following is characteristic of enzymes?
a.They raise the energy activation of a reaction by binding the substrate.
b.They raise the amount of energy present in the substrate
2.If there re 12 diff. intermediate products produced in the stages for production of a molecule in a cell, we can expect that there:
a.is one enzyme that carries this process through to the end product.
b.is one enzyme for degradation and another fr synthesis.
c.must be 12 diff. raw materials combined in the cell by one enzyme.
d.are about 12 enzymes, at least one responsible for each step in teh metabolic pathway
3.Coupling occurs when the energy released by an exergonic reaction is
a.used to drive another exergonic reaction
b.used to drive an endergonic reaction
c.lost as nonusable heat to the environment
d.used to decrease the entrophy of the universe
e.all above
4.If all teh sunlight that struck the earth's surface was (temporarily) absorbed and none was immediatly reflected back into space then:
a.the earth would not be visible from the moon.
b.more sunlight absorbed on the surface of the earth
c.if teh dramtic increase in temp., ice melt, evaporation, etc....still allowed plant life, there might be a small increase in photosynthesis (but most sunlight goes to these other functions)
d.all above
e.None above
5.T/F Pushing a rock out of a hole from which is rest is analogous to the energy of activation ofa chemical reaction
6.T/F In cellular metabolism, chemical reactions occur randomly in various parts of teh cell, as chemicals happen to bump into each other.
7.T/F The energy to activation is the energy that must be supplied do that molecules are able to interact with each other in a chemical reaction. |
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| Tonis |
| haha, you actoually expect people to answear these questions? |
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| butterfly |
[QUOTE]Originally posted by butterfly
1.Which of the following is characteristic of enzymes?
a.They raise the energy activation of a reaction by binding the substrate.
2.If there re 12 diff. intermediate products produced in the stages for production of a molecule in a cell, we can expect that there:
a.is one enzyme that carries this process through to the end product.
b.is one enzyme for degradation and another fr synthesis.
c.must be 12 diff. raw materials combined in the cell by one enzyme.
d.are about 12 enzymes, at least one responsible for each step in teh metabolic pathway
i am not even going to guess on this one.
3.Coupling occurs when the energy released by an exergonic reaction is
a.used to drive another exergonic reaction
b.used to drive an endergonic reaction
c.lost as nonusable heat to the environment
d.used to decrease the entrophy of the universe
e.all above
4.If all teh sunlight that struck the earth's surface was (temporarily) absorbed and none was immediatly reflected back into space then:
a.the earth would not be visible from the moon.
b.more sunlight absorbed on the surface of the earth
c.if teh dramtic increase in temp., ice melt, evaporation, etc....still allowed plant life, there might be a small increase in photosynthesis (but most sunlight goes to these other functions)
d.all above
e.None above
this one is either a or d. a is definitely true but the other two answers are worded oddly.
5.T/F Pushing a rock out of a hole from which is rest is analogous to the energy of activation ofa chemical reaction
that is a reatarded analogy but true
6.T/F In cellular metabolism, chemical reactions occur randomly in various parts of teh cell, as chemicals happen to bump into each other.
i am pretty sure this is false. i think the cell has specific places for reactions.
7.T/F The energy to activation is the energy that must be supplied do that molecules are able to interact with each other in a chemical reaction.
this is kind of true. the activation energy is necessary to start a reaction.
don't take any of these answers with too much weight. i was never really a biology person. why don't you try using your text book for the answers? |
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| Dj Fred Lamar |
| quote: | Originally posted by Tonis
haha, you actoually expect people to answear these questions? |
Worth a try, a good number of ppl browse through this section.
As for the text book, that thing is like reading morse code, I've only found several of the answers w/ it.
But, thanks for the replies....:D |
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| butterfly |
| quote: | Originally posted by Dj Fred Lamar
Worth a try, a good number of ppl browse through this section.
As for the text book, that thing is like reading morse code, I've only found several of the answers w/ it.
But, thanks for the replies....:D |
try google. |
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| Dmatrox |
1. A, well its sort of right, its definately not A. The correct answer should be: Enzymes DECREASE activation energy of a reaction by binding to the substrate.
2. i think its D, not sure about this one.
3. B
4. I think A or D. Although the idea in C would be correct if it stated that plants would absorb more light than just blue and red wavelengths.
5. I think True
6. F
7. T
im pretty sure on all except 2,4,5. good luck.
| quote: |
1.Which of the following is characteristic of enzymes?
a.They raise the energy activation of a reaction by binding the substrate.
b.They raise the amount of energy present in the substrate
2.If there re 12 diff. intermediate products produced in the stages for production of a molecule in a cell, we can expect that there:
a.is one enzyme that carries this process through to the end product.
b.is one enzyme for degradation and another fr synthesis.
c.must be 12 diff. raw materials combined in the cell by one enzyme.
d.are about 12 enzymes, at least one responsible for each step in teh metabolic pathway
3.Coupling occurs when the energy released by an exergonic reaction is
a.used to drive another exergonic reaction
b.used to drive an endergonic reaction
c.lost as nonusable heat to the environment
d.used to decrease the entrophy of the universe
e.all above
4.If all teh sunlight that struck the earth's surface was (temporarily) absorbed and none was immediatly reflected back into space then:
a.the earth would not be visible from the moon.
b.more sunlight absorbed on the surface of the earth
c.if teh dramtic increase in temp., ice melt, evaporation, etc....still allowed plant life, there might be a small increase in photosynthesis (but most sunlight goes to these other functions)
d.all above
e.None above
5.T/F Pushing a rock out of a hole from which is rest is analogous to the energy of activation ofa chemical reaction
6.T/F In cellular metabolism, chemical reactions occur randomly in various parts of teh cell, as chemicals happen to bump into each other.
7.T/F The energy to activation is the energy that must be supplied do that molecules are able to interact with each other in a chemical reaction.
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| PeacefulWarrior |
| quote: | Originally posted by Dj Fred Lamar
1.Which of the following is characteristic of enzymes?
Both of the choices are incorrect, however if I had to choose one, I'd choose (b). Enzymes lower the activation eneregy of reaction and therefore help the reaction occur. If the energy of activation is increased, the reaction is less likely to occur. The enzyme does restructure the substrate such that significant functional groups are in proximity to each other, leading to the formation of the product.
2.If there re 12 diff. intermediate products produced in the stages for production of a molecule in a cell, we can expect that there:
d.are about 12 enzymes, at least one responsible for each step in teh metabolic pathway
3.Coupling occurs when the energy released by an exergonic reaction is
b.used to drive an endergonic reaction (i.e. energy is released to drive another unfavorable reaction)
4.If all teh sunlight that struck the earth's surface was (temporarily) absorbed and none was immediatly reflected back into space then:
d.all above
5.T/F Pushing a rock out of a hole from which is rest is analogous to the energy of activation ofa chemical reaction
True
6.T/F In cellular metabolism, chemical reactions occur randomly in various parts of teh cell, as chemicals happen to bump into each other.
This question is too vague. Yes, chemical reactions occur randomly within the cell, but specific groups of chemical reactions are compartamentalized (i.e. cellular metabolism primarily takes place in the mitochondria; degregation in the lysozomes but the mixing of chemicals within those compartments is random)
7.T/F The energy to activation is the energy that must be supplied do that molecules are able to interact with each other in a chemical reaction.
True (If by interact you mean the formation of products.)
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| tranceaholic |
| quote: | Originally posted by Dj Fred Lamar
Whats up TAs. just got a take home test and needed alittle help w/ some of the questions? Thansk in advance for any replies.
1.Which of the following is characteristic of enzymes?
a.They raise the energy activation of a reaction by binding the substrate.
b.They raise the amount of energy present in the substrate
2.If there re 12 diff. intermediate products produced in the stages for production of a molecule in a cell, we can expect that there:
a.is one enzyme that carries this process through to the end product.
b.is one enzyme for degradation and another fr synthesis.
c.must be 12 diff. raw materials combined in the cell by one enzyme.
d.are about 12 enzymes, at least one responsible for each step in teh metabolic pathway
3.Coupling occurs when the energy released by an exergonic reaction is
a.used to drive another exergonic reaction
b.used to drive an endergonic reaction
c.lost as nonusable heat to the environment
d.used to decrease the entrophy of the universe
e.all above
4.If all teh sunlight that struck the earth's surface was (temporarily) absorbed and none was immediatly reflected back into space then:
a.the earth would not be visible from the moon.
b.more sunlight absorbed on the surface of the earth
c.if teh dramtic increase in temp., ice melt, evaporation, etc....still allowed plant life, there might be a small increase in photosynthesis (but most sunlight goes to these other functions)
d.all above
e.None above
5.T/F Pushing a rock out of a hole from which is rest is analogous to the energy of activation ofa chemical reaction
6.T/F In cellular metabolism, chemical reactions occur randomly in various parts of teh cell, as chemicals happen to bump into each other.
7.T/F The energy to activation is the energy that must be supplied do that molecules are able to interact with each other in a chemical reaction. |
here are my answers..1-a 2-a not sure about it..3-b 4-d 5-True 6-false they occur in the cytoplasm and the matrix of the mitochondria
7-True |
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