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Results tagged with biochemistry
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user 6136
The study of chemistry within the scope of biology: the compounds that occur and the reactions involving them in living organisms.
3
votes
1
answer
123
views
Confusion about Photosystem 2 with regards to lysis of water
I am slightly confused about the role of $\ce{H2O}$ lysis in PII. I know that this releases $\ce{H+}$ ions, which I think are important because they drive the production of $\ce{ATP}$ through F-Atpase …
- 2,969
1
vote
1
answer
142
views
Is phosphofrucrokinase1 PFK1 found in the liver? [closed]
I am trying to understand glycolysis control. One thing I am stuck on is whether there is PFK1 in the liver, or only PFK2.
Edit: As far as I am aware, there is no pfk2 in muscle cells, only pfk1. Th …
- 2,969
4
votes
1
answer
2k
views
Glycogen vs cellulose-curvature of glycogen molecule?
I was wondering if anyone knows what the degree of curvature is or bond angle between the $\alpha$ glucose molecules in glycogen is. I know that glycogen/amylose/amylopectin have a general curved back …
- 2,969
2
votes
1
answer
203
views
What are some uses of oxidative/reductive power inside cells? [closed]
I know respiration and photosynthesis are based on oxidation and reduction, and the formation of NADH and NADPH in them is very important for many cell processes. I know that NADPH, for example, is us …
- 2,969
1
vote
1
answer
72
views
Help understanding the word 'glycosaminoglycan'?
In my biochemistry course I have to know about various polysaccharides and variants, and I am struggling with remembering them. I think it would help if I could break down their names. …
- 2,969
11
votes
1
answer
3k
views
Quinone A, Quinone B, Ubiquinone, Plastoquinone: whats the difference?
I am getting very confused about this. My understanding so far is that ubiquinone is used as an electron (and proton) carrier in oxidative phosphorylation in the mitochondria whereas plastoquinone is …
- 2,969
2
votes
1
answer
510
views
Enzyme kinetics types?
In lectures, we have discussed Michaelis Menten enzyme kinetics, but from lectures it was clear that this was not the only type of kinetics.
After looking into this, I have found enzymes that give a …
- 2,969
1
vote
1
answer
663
views
Transmembrane protein: does signal peptide always form a loop?
So I have read a few times that
b. SP probably forms loop not arrow. Loop enters channel (translocon) in membrane. SP loop is probably what opens (gates) the channel on the cytoplasmic side.
Source
…
- 2,969
2
votes
1
answer
402
views
Redox potentials in photosynthesis light dependent stage
In my lecture notes, it states
...there is a significant thermodynamic problem due to the respective redox potentials of the half reactions:
H2O<--> 1/2 O2 + 2H+ +2e- pE=+0.82V
NADP+ +2H+ +2e- < …
- 2,969
1
vote
2
answers
8k
views
What is the name of the bond between phosphate and the sugar in a nucleotide?
I am slightly confused about what the name of the bond is between the phosphate and sugar within a nucleotide. All my research comes up with is a phosphodiester bond being the backbone of DNA. But wit …
- 2,969
2
votes
1
answer
6k
views
Are glycoproteins and glycolipids present only on the cell surface membrane?
I haven't read this being stated explicitly, however whenever I read about proteins and glycoproteins this seems to be implied. For example, in this Wikipedia article,
Lipid and proteins on the ce …
- 2,969
2
votes
1
answer
2k
views
How do detergents interfere with protein assays?
This has been getting me stuck. I've tried to understand what a detergent would do in an assay, but I can't figure out whether it would affect the protein or the reagent (say, in a Bradford assay).
- 2,969
5
votes
1
answer
2k
views
How is adrenaline (also known as "epinephrine") a ligand?
I keep reading that adrenaline is a ligand, however, from what I understand a ligand is a molecule or ion which donates a pair of electrons to a central transition metal ion in a complex. If this is t …
- 2,969
3
votes
1
answer
912
views
How is the rate of gluconeogenesis controlled in the cell?
As far as I am aware, all steps in glycolysis are readily reversible except the phosphorylation of glucose, the phosphorylation of fructose6 phosphate, and the phosphorylation of phosphoenolpyruvate t …
- 2,969
4
votes
2
answers
4k
views
Definition of a Katal (unit of enzyme activity)
I am very confused about what one 'Katal' actually is. From Wikipedia,
"The katal is not used to express the rate of a reaction; that is expressed in units of concentration per second (or moles pe …
- 2,969