Which of the following allows the AIDS virus, which contains RNA, to insert viral DNA into the DNA of a host T-cell after the AIDS virus enters the cell?

A. Reverse transcriptase, an enzyme encoded by the virus.

B. Receptor proteins located on the surface of the virus.

C. The phospholipids found on the envelope of the virus.

D. The protein that makes up the capsid of the virus.

Answer Explanation:

Reverse transcriptase, an enzyme encoded by the virus. This enzyme can convert the viral RNA into DNA, which can then integrate into the host cell's genome and hijack its machinery to produce more viruses. The other options are not relevant to this process. Receptor proteins are involved in binding the virus to the cell membrane, but they do not insert viral DNA into the cell. The phospholipids and the protein capsid are structural components of the virus, but they do not have any enzymatic activity.

Therefore, the Correct Answer is A.

Q #1: Which of the following is the function of a totipotent cell?

A. Aids in the maturation of sex cells

B. Carries electrical impulses

C. Develops into any kind of cell

D. Fights infectious diseases

Answer Explanation

A totipotent cell is a type of stem cell that has the ability to develop into any kind of cell in the body, including the cells that make up the placenta and the umbilical cord. This means that a totipotent cell can generate a complete organism from a single cell. The only natural example of totipotent cells are the fertilized egg and the cells produced by the first few divisions of the egg. Totipotent cells are different from other types of stem cells, such as pluripotent cells, which can develop into any cell type except for the placenta and the umbilical cord, and multipotent cells, which can only develop into a limited range of cell types.
Q #2: Osteoporosis results from which of the following?

A. An increase in osteocyte activity while osteoclast activity continues at expected levels

B. A decline in osteoblast activity while osteoclast activity continues at expected levels

C. An increase in osteocyte activity while osteoblast activity continues at expected levels

D. A decline in osteoclast activity while osteoblast activity continues at expected levels

Answer Explanation

Osteoporosis is a condition that affects the bones, making them weak and brittle. It occurs when the balance between bone formation and bone resorption is disrupted. Bone formation is carried out by cells called osteoblasts, while bone resorption is done by cells called osteoclasts. Osteocytes are mature bone cells that maintain the bone matrix. Osteoporosis results from a decline in osteoblast activity while osteoclast activity continues at expected levels, leading to more bone loss than bone gain. This reduces the bone density and increases the risk of fractures.
Q #3: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

A. 12

B. 3

C. 4

D. 7

Answer Explanation

The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.

The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.

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Which of the following allows the AIDS virus, which contains RNA, to insert viral DNA into the DNA of a host T-cell after the AIDS virus enters the cell?

More Questions on TEAS 7 Science

Q #1: Which of the following is the function of a totipotent cell?

Answer Explanation

Q #2: Osteoporosis results from which of the following?

Answer Explanation

Q #3: Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?

Answer Explanation

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