What part of the hiv virus serves to protect the nucleic acid core?

The correct answer is -

Capsid (coat of protein).

Explanation:

All viruses (microscopic, acellular, non living organisms) form sheath of protein or a proteinaceous coat known as capsid, which surrounds the nucleic acid core (which may be DNA or RNA).

HIV (human immuno deficiency virus) has a RNA nucleic acid core that is single stranded and surrounded by a protein coat known as capsid.

Thus, capsid is the right answer.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.