A specific enzyme catalyzes only a specific substrate. Another name for starch is "amylose". So amylase catalyzes amylose. Just like lactase catalyzes lactose. For people who are lactose intolerant, their bodies don't, or in small quantities, produce lactase, so it doesn't get digested. So, only the enzyme "cellulase" will catalyze the hydrolysis of "cellulose".
there is a difference between alpha and beta startches. cellulose is alpha linked, making it much more stable and more difficult to break down. startches that amylose breaks down quickly are beta linked, a much easier bond to break.
Enzymes are chemicals (proteins) that are directed towards a specific function.All enzymes are unique.Only a specific enzyme with a specific substrate will create a reaction. Cellulose is the most abundant polymer on earth but only a few organisms have the enzyme to break down cellulose.
Humans, with animal metabolism, can digest starch because we have the enzyme alpha-amylase to do the job.
Starch is a mixtures of glucans (polymers of glucose) that plants synthesize as their main food reserve, deposited in the cytoplasm of plant cells as insoluble granules of alpha-amylose (a linear polymer of several thousand glucose residues linked by alpha(1-4) bonds), and amylopectin (glucose residues linked by alpha(1-4) bonds and with alpha(1-6) branches every 24 to 30 glucose residues on average).
The enzyme alpha-amylase (present in saliva) randomly hydrolyzes all alpha(1-4) glucosidic bonds of starch (except those next to branches, and its outermost bonds). Once the chewed food reaches the stomach, acidic conditions of gastric juices inhibit the enzymatic activity of salivary alpha-amylase. However, by that time, starch has been reduced from several thousand to fewer than eight gluse units.
Starch digestion continues in small intestine by the action of pancreatic alpha-amylase and produces a mixture of maltose (a disaccharide of alpha(1-4) linked glucose residues), maltotriose (three glucose residues linkd by alpha(1-4) bonds), and dextrins (oligosaccharides with alpha(1-6) branches) that will be degrades into its monosaccharides by specific enzymes present in brush border membranes of the intestinal mucose (i.e., alpha-glucosidase, alpha-dextrinase or debranching enzyme, sucrase, and, at least in infants, a lactase.
Now, animal metabolism cannot metabolize cellulose because alpha-amylase, as the principal enzyme to metabolize starch, and the others that take place in the digestive tract, can hydrolize only glucoses linked with alpha bonds. Cellulose is a polymer of glucoses linked with beta bonds, this a tremendous impediment to alpha-amylase to digest cellulose. This enzymatic hydrolisis is given by microorganims.
The geometry of the bonds is different, and the shapes of enzyme active sites are highly specific.
starch is insoluble....
In a Bio-Catalytic manner.
Starch
The monomer unit of polysacharides such as starch and cellulose is glucose.
No. Cellulose and starch are both forms of carbohydrates, not a form of one another.
Starch-you use an enzyme e.g. amylase to convert the starch to sugar ,add an enzyme which breaks the starch or cellulose into sugars. The yeast will then ferment the sugars. Not sure about cellulose...
None. Humans can't digest cellulose. Bacteria in the large intestine can digest some cellulose, creating gas and vitamin K.
No, starch is easier to digest.
Salivary amylase is not able to digest cellulose. Amylase has the ability to digest starch but cellulose is a fibre which in indigestible.
FALSE! I think (•_•)
Both starch and cellulose are polymers of glucose. However, the individual glucose units are linked differently in the two. Humans have an enzyme which is capable of breaking the linkages used to form starch, but do not have one that can break the linkage used to form cellulose. (If you want the technical terms, cellulose uses a beta(1-4) link and starch uses both alpha(1-4) and alpha(1-6) links.)
Hm... (first time answering a question on here) Well, you can digest bread because it is made of grains. Bread is a starch polysaccharide and is, therefore, made of carbohydrates. Paper is made of cellulose and nothing in the world can digest cellulose so... yeah... 0w0"
Humans don't have the enzymes required to digest it. Cellulose is made up of sugars, but they are intertwined in a more complicated way than starch.
People cannot digest cellulose
Starch
the appendix digest cellulose, but human appendix does not work.
No. Cellulose and starch are both forms of carbohydrates, not a form of one another.
The monomer unit of polysacharides such as starch and cellulose is glucose.
Starch-you use an enzyme e.g. amylase to convert the starch to sugar ,add an enzyme which breaks the starch or cellulose into sugars. The yeast will then ferment the sugars. Not sure about cellulose...