HIV is a retrovirus which contains RNA as its genetic material. Once HIV enters the body, it attaches to T cells that help other lymphocytes respond to infection. Gradually, HIV kills off most of the helper T cells. The RNA is inside the capsule of the virus and is labeled A.
Answer:
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Answer: Prokaryotic cells lack a nucleus and membrane-bound structures. Eukaryotic cells have a nucleus and membrane-bound structures called organelles.
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Answer:
Lowest to highest degree of internal organization form the given items are:
1) <u>Digestive system:</u> Digestive system is a type of organ system, which is consist of several digestive organs such as mouth, stomach, pancrease and intestine.
2) <u>Stomach: </u>Stomach is a type of organn which is a functional group of tissues.
3) <u>Stomach lining tissues: </u>These are functional group of cells.
4) <u>Epithelial stomach cell: </u>cell is a basic unit of all life.
Hence, the correct order form loowest to highest degree of internal organization is:
Digestive system => Stomach => Stomach lining tissues => Epithelial stomach cell
