The plasma membrane is a bilayer. lipid phospholipid carbohydrate protein

Option B. "Phospholipid"

Explanation:

Plasma membrane is a biological membrane that covers the outermost layer of the organism. It's composition varies in some of bacterial cells but most of them are made up of phospholipid bilayer.

Phoshpolipid bilayer are amphiphilic in nature with two hydrophobic fatty acid tails and one hydrophilic phosphate head.

It's main function is it acts a barrier to keep the proteins other molecules and ions out of the cell and diffuses them across this membrane when it is require.

Thus, the correct answer is phospholipid.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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