OnlySinan

If you increase the substrate concetration' date=' then the enzmatic reation will increas right?

 

If you alter the pH affect of an enzymatic reaction,then the enzyme will denature right?

 

are my concepts right ?

 

also, If you pretreat an enzmye with high heat, how will it affect the rate?[/quote']

 

Hi Nemzy. I am just adding some extra's to dear ecoli's answer.

The more substrate is added to the enzyme, the faster the reaction goes. But that is not infinite. Because on a certain substrate concentration, all enzymes assosiated are with substrate molecules. The latter means that adding more substrate will not affect the reaction rate. A key phrase for looking for more information on that is: "michaelis-menten equation".

 

Enzymes have their optimum pH and temperature where they work the best. Every enzyme has his own pH and Temp where it delivers its best work. An example should be: amylase (degrades strach) in your sliva has an optimum pH of a little bit more than 7 which means that it works perfectly in the saliva. Enzymes in yours stomach should have a low optimum pH since the environment there is higly acidic. What do you think the optimum temperature of these enzymes should be??? 37 degrees C I will say!

 

High temperatures make enzymes denaturate since they are proteins (disturbing H-bonds). Extreme pHs make enzymes also denaturate.

 

thanks

A nucleotide containing a purine, ribose, and a phosphate group could be a building block for?

a) dna

b) mRna

c) tRna

d) rRna

e) b,c,d

since RNA is Ribose nucleic acid, while DNA id deoxy r....

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A DNA molecule with 5'ATCGTAC3' = 3'TAGCATG5' right?

is right!!!

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I am not sure of the answers of the resting questions

Since a lot of death occurs because a persons body becomes impeded from producing enough immunity, why cant science just take the white blood cells from another person and flood the sick person with them? Couldnt they IV them directly from one person to another some how?

It's possible but it's risky!!! White blood cells are "available" in many sorts: T cells (Th1 and Th2), B cells, microphages, neutrophills and many more. The problem is that B cells and T cells which trigger and maintain the aquired immune response are self tolerant (they will not attack the own cells) and therefore they will attack the acceptor's cells. The microphages etc... are not cell specific since they attack only pathogens. The latter white blood cells can be used for transfer.

They are nice indeed!

P.S. Make sure you are vaccinated for the one you buy hahahahahah.

"E. coli have a natural affinity for plastic. Shouldn't they attach themselves to the plates' date=' without any other substrate?"

 

Let's not jump into rash conclusions here. For example, Michael Jackson seems to have a natural affinity for plastic too, yet he doesn't keep a plastic plate on his face (although I think he should).[/quote']

 

HAHAH damn man, this is funny.

Hi nezmy. Your calculation is 100% right. But I would like to refer to the question: "polypeptide made outof 5 amino acids". That's wrong beacause a polypeptide must contain a lot of aminoacids. I would call this an oligopeptide?

Efficiency is relatively optimal in our bodies. This is because as mentioned above: we need this temperature to achieve the optimum state for the functioning of our enzymes.

Hi vijun, I can't give you an answer to your little question in the end of your post. But I can give a very short opinion on your staments.

Don't you think that legalizing and using hard drugs is not only a matter of self harm (which some may accept generally), but it indirectly promotes crime and several negative cosequences?

Hi rakuenso,

sorcerer is right, bacteria (prokaryotes) lack the mitochindria organelles which normally drive the ATP synthesis in our cells. But the alternative way to synthisizing ATP is setting up a proton gradient over the inner membrane (between the periplasmatic space and the cytosolic space) which "spins" the ATP-synthase making the ATP.

(I don't have a link, i can refer to the book The CELL by Alberts et al.)

I think this question is better to answer if you look in a school text-book. But below are some short answers!

>>>I know that the mitosis is the division of the two nuclei but when I got to the part of the chromatin, I got lost.

Mitosis is the cel-cycle phase before the cytokynesis (nucleus division). It includes DNA duplication (2 times the DNA amount) and DNA condensation (when visible chromosomes are made), etc....

After mitosis is finished, two cells are generated with exactly the same DNA (n=2).

Meiosis is almost the same as mitosis but it it generates two cells without duplicating the DNA. The two cells have the half of the normal DNA amount. As usual: sperm cells and egg cells are generated via meiosis because they must have that half amount of the DNA of a normal cell (haploid; n=1).

>>>What is the DNA double helix and how this differ from chromosome itself?

DNA double helix is the DNA made out of 2 phosphodiesther backbones with bases opposing each other. A chromosome is a long linked DNA molecule containing many genes. During mitosis the chromosomes condense and become visible.

>>>Also, from the cell cycle, I see the word interphase. There are three part, G_1, S, and G_2. What is the difference between each step?

G1: first gap phase where the cell checks if the internal and external environment capable is for starting the S phase.

S: the phase where the DNA duplicates.

G2: The cell checks if it's appropriate to go into mitosis again.

Cheerz! Sinan