The plasma membrane of e. coli is approximately 75% protein and 25% phospholipid by weight. it is known that the average membrane protein molecular weight is 50,000 da and an average membrane phospholipid molecular weight is 750 da. calculate the number of membrane phospholipid molecules present per molecule of membrane protein. number phospholipid molecules per protein molecule select the additional information that one would need to calculate the fraction of membrane surface covered by phospholipids. the surface area of the e. coli cell the average cross-sectional areas of a 50,000 da protein and a 750 da phospholipid in a bilayer the average densities of a 50,000 da protein and a 750 da phospholipid the number of moles of protein and phospholipid 。in the membrane

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

the answer to this question is 3.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.