ATAR Notes: Forum
VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: --whiteskies on January 27, 2013, 09:06:10 pm
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I'm a bit relieved to have stumbled upon atarnotes, amazing help from amazing people :)
I was working through some non-exam style bio questions and there was this one question that was just kicking me in the face because it looked like a very simple question that I didn't know how to approach or answer:
Where is the monosaccharide glucose found in its natural state?
Thanks heaps!
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I'm a bit relieved to have stumbled upon atarnotes, amazing help from amazing people :)
I was working through some non-exam style bio questions and there was this one question that was just kicking me in the face because it looked like a very simple question that I didn't know how to approach or answer:
Where is the monosaccharide glucose found in its natural state?
Thanks heaps!
In all sorts of places, blood is one example!
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I'm a bit relieved to have stumbled upon atarnotes, amazing help from amazing people :)
I was working through some non-exam style bio questions and there was this one question that was just kicking me in the face because it looked like a very simple question that I didn't know how to approach or answer:
Where is the monosaccharide glucose found in its natural state?
Thanks heaps!
Yes, these sorts of questions appear simple but they really do get you to think. Glucose in its natural state can be found in many places. If you're getting stuck, perhaps reflect where you could find some polysaccharides either in a cell or organism. :)
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Would food be a correct answer or not?:\
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Perhaps so in non-processed products. :)
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Glucose is a monosaccharide that can basically be found anywhere, (to be specific I would probably say the cytosol of a cell when it is undergoing Glycolysis (i.e. of Cellular Respiration), because it is an organic product broken up during cellular respiration to release Adenosine Tri-phosphate. That question would require a really ambiguous answer and as you have specified, it is a (non-exam style) question, so VCAA would probably not ask that. It is helpful to know that it can be anywhere though :)
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I just thought of something; can we say that it is found in the liver in an inactive form (glucagon). Glucagon is basically excess glucose that has been transferred to glucagon and stored in the liver until further use. Advice on whether that is a potential answer or whether I am completely wrong lol!
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I just thought of something; can we say that it is found in the liver in an inactive form (glucagon). Glucagon is basically excess glucose that has been transferred to glucagon and stored in the liver until further use. Advice on whether that is a potential answer or whether I am completely wrong lol!
Glycogen not glucagon. Glucagon is a peptide hormone that signals to the liver cells to release glycogen.
And nah; glycogen and glucose are not the same thing. They are two different molecules; one is a polymer. It's like calling ethene and polythene the same substance :)
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Lesson learnt; that is true though, glucagon is a hormone secreted by the pancreas to increase blood glucose levels to maintain a relatively stable internal environment within narrow ranges [homeostasis]. And of course glycogen is a storage of energy in animal cells... a polysaccharide. Glucose is a monosaccharide.
I think that we should just stick to 'It can be found anywhere' hehe :) Thanks TRex.
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Glucose is a monosaccharide that can basically be found anywhere, (to be specific I would probably say the cytosol of a cell when it is undergoing Glycolysis (i.e. of Cellular Respiration), because it is an organic product broken up during cellular respiration to release Adenosine Tri-phosphate.
The breakdown of glucose doesn't directly release Adenosine Triphosphate (ATP). It is rather the energy from the glucose breakdown during cellular respiration that is utilised to synthesise ATP from Adenosine Diphosphate (ADP) and inorganic phosphate. (The enzyme ATP synthase catalyses this reaction.) I know I'm being a little pedantic, but I just don't want anyone to get the wrong idea :)
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Perhaps so in non-processed products. :)
Yeah that's what I was thinking
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it is a (non-exam style) question, so VCAA would probably not ask that.
Actually, I think it's a legitimate question :)
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I think it's a little bit ambiguous as theoretically glucose can be found in small quantities just about anywhere, if VCAA where to ask it, they would potentially precede it with a lead in question and say perhaps where is a significant quantity of glucose most likely to be found (A) (B) (C) (D) IMO
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The breakdown of glucose doesn't directly release Adenosine Triphosphate (ATP). It is rather the energy from the glucose breakdown during cellular respiration that is utilised to synthesise ATP from Adenosine Diphosphate (ADP) and inorganic phosphate. (The enzyme ATP synthase catalyses this reaction.) I know I'm being a little pedantic, but I just don't want anyone to get the wrong idea :)
Of course, its a chain of reactions that eventually produce these ATP molecules per molecule of glucouse. My response was a bit ambiguous because I skimmed over the concept very quickly. Further during the year I'll delve in deeper to the various stages of cellular respiration (Glycolysis, Kreb's Cycle and the Electron Transport chain) - once again remembering that:
Glycolysis - the release of 2 ATP molecules/molecule of glucose.
Kreb's Cycle - the release of 2 ATP molecules/molecule of glucose.
Electron Transport Chain - the release of 32-34 ATP molecules/molecule of glucose.
:) I appreciate your help though; I need to rectify those tiny answers in my responses for the pedantic VCAA assessors.
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Of course, its a chain of reactions that eventually produce these ATP molecules per molecule of glucouse. My response was a bit ambiguous because I skimmed over the concept very quickly. Further during the year I'll delve in deeper to the various stages of cellular respiration (Glycolysis, Kreb's Cycle and the Electron Transport chain) - once again remembering that:
Glycolysis - the release of 2 ATP molecules/molecule of glucose.
Kreb's Cycle - the release of 2 ATP molecules/molecule of glucose.
Electron Transport Chain - the release of 32-34 ATP molecules/molecule of glucose.
:) I appreciate your help though; I need to rectify those tiny answers in my responses for the pedantic VCAA assessors.
For glycolysis, you might want to say that there's a net output of 2 ATP molecules
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Kreb's Cycle - the release of 2 ATP molecules/molecule of glucose.
*GTP :P
Also remember 3 NADH and 1 FADH produced per cycle - i.e. per acetyl-CoA - i.e. 6 NADH and 2 FADH per glucose.
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*GTP :P
Huh?
(this is VCE bio right?)
ATP is more than enough detail for the Krebs cycle lol
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Huh?
(this is VCE bio right?)
ATP is more than enough detail for the Krebs cycle lol
I've always thought that GTP is produced which then in turn transfers the phosphate to an ADP, so you do end up with ATP, but ATP isn't directly produced in from the citric acid cycle.
Whoops.
Edit - yeah, it's GTP that's produced, but guess in VCE they don't look at that =.=
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I've always thought that GTP is produced which then in turn transfers the phosphate to an ADP, so you do end up with ATP, but ATP isn't directly produced in from the citric acid cycle.
Whoops.
Edit - yeah, it's GTP that's produced, but guess in VCE they don't look at that =.=
Yeah, you're right, but GTP definitely isn't mentioned in VCE, so ATP's fine
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Yeah, you're right, but GTP definitely isn't mentioned in VCE, so ATP's fine
I think ATP mentionings are sufficient, and knowing the energy yield for every process:
*Glycolysis - the net output of 2 ATP molecules/ glucose molecule.
*Kreb's Cycle - the net output of 2 ATP molecules/glucose molecule.
*Electron Transport Chain - the net output of 32-34 ATP molecules/glucose molecule.
:) Those other aspects (i.e. NADH, ADP and ATP, FADH etc) can be elaborated upon when you delve deep into each process and look at chemical changes, inputs/outputs, etc. :)
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I think ATP mentionings are sufficient, and knowing the energy yield for every process:
*Glycolysis - the net output of 2 ATP molecules/ glucose molecule.
*Kreb's Cycle - the net output of 2 ATP molecules/glucose molecule.
*Electron Transport Chain - the net output of 32-34 ATP molecules/glucose molecule.
:) Those other aspects (i.e. NADH, ADP and ATP, FADH etc) can be elaborated upon when you delve deep into each process and look at chemical changes, inputs/outputs, etc. :)
Don't worry about mentioning 'net' for the Kreb's cycle and the electron transport chain. It's just glycolysis you have to worry about
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^Both of those questions are /way/ too much detail for VCE bio. Aerobic respiration is like 1/6th of a single AoS, they don't expect and/or examine that depth.
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Take #3 haha :p
Glycolysis: the net output of 2 ATP molecules/glucose molecule.
Kreb's Cycle: the release of 2 ATP molecules/glucose molecule
Electron transport chain: the release of 32-34 ATP molecules/glucose molecule.
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Yes.
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Yes.
YAY!! :) haha, finally got that expression correct!