<span>The first stage of HIV infection is known as the acute stage. The body responds by producing HIV antibodies and killer T- cells which are special lymphocytes that seek out and destroy invading pathogens such as viruses and bacteria. Two to four weeks after infection, the immune system launches an attack against HIV using these antibodies and killer T-cells, significantly reducing HIV level on blood. A percentage of the viruses however escapes this onslaught by hiding in other cells and continue to multiply.</span>
Answer:
(D) They are all acids
Explanation:
Amino acids are monomers, fatty acids are polymers and they do not contain nitrogen. All four are acidic in nature for different reasons:
- Amino acids due to acidic carboxyl group -COOH.
- Fatty acids due to end chain acidic carboxyl group -COOH.
- Nucleotides because they have phosphate groups (which are acidic in nature).
- Monosaccharides due to presence of aldehyde group -CHO (which can oxidise to -COOH).
I believe the answer you are looking for is empirical. I hope this helps.
Cholesterol travels in the blood transported in molecules called lipoproteins.