Which macromolecule forms a double layer as the primary structure of cell membranes? fats oils phospholipids steroids

a neutral ph of 7 and normal organism temperature is needed for a certain enzyme to be effective.  

what would happen to the enzyme if the ph and/or temperature fluctuate greatly from the norm?  

a.the enzyme’s hydrogen bonds will break.  

b.the activation energy will increase.  

c.more product will be formed.

d.the ideal temperature and ph for the enzyme function will decrease.  

it would be rhyolitic hope this

the tricuspid valve is present between right atrium and right ventricle

answer; the code in musculoskeletal system subsection is associated with deep tissue possibly to the bone;