Biology

Differences between Cellulose and Starch:

Starch:

It is an insoluble polysaccharide formed from two Aplha-glucose monomers It is bracnhed and has amylopectin with 1-6 glycosidic bonds and 1-4 glycosidic bonds and amylose with 1-4

glycosidic bonds only Hydrogen bonds present between the molecules It can be broken down back into glucose molecules, which can be used in respiration which releases energy Starch is the polysaccharide product of glucose molecules in plants It is an energy storage molecule Glucose monomers are not inverted Starch can be a mixture of two types of molecules

Cellulose:

Also an insoluble polysacchride formed from Beta glucose monomers 1-4 glycosidic bonds formed from unbrached polysachhride Alternate Beta_glucose molecules are inverted through 180 degrees Hydrogen bonds form between OH groups in neighbouring cellulose chains forming bundles of microfibrils Cellulose molecules are only of one type of chain, It is a stareight chain.

Differences between Ithering’s system and the current system

Modern protocols Withering’s digitalis’s soup Animal testing no Animal testing Tested on healthy patients no Tests on healthy patients Double Blind Trial no Double Blind Trial Placebo Used no Placebo Used Controlled by regulatory authorities Not Controlled Large sample size Small sample size

However the Similarities were:

Both isolated a possible drug both initially tested on a small group of patients