Answer:
The correct option is b
Explanation:
Phospholipids are lipids that contains a phosphate group, which forms the "head" of the molecule and is hydrophilic (water loving). The "tail" of phospholipids is made of two fatty acids which are hydrophobic (water fearing). The phospholipid in the cell membrane acts as a selectively permeable barrier that regulates what goes in and out of the cell <u>thereby protecting the cell from some external molecules and ions</u>.
Bloodstain pattern analysts sometimes are called to gruesome scenes to gather crucial evidence regarding violent crimes. At other times, they might deal only with a single drop of blood or fingerprint.
Building a polypeptide: Polymers are chains of subunits, monomers, linked together by chemical bonds. The bond between two amino acids is known as a peptide bond<span>. Two amino acids, joined together by a </span>peptide bond<span>, are known as a </span>dipeptide<span>. An amino acid polymer is known as a polypeptide.</span>
You are a doctor examining a bone sample taken from a patient with weak bones. You find that the bone tissue contains many small pores. This is mostlikely caused by <span>reduced bone marrow in the spongy bone.</span>