The measurement indicated by the line across the center of the cell is best referred to as which of the following?

A. Diameter

B. Volume

C. Area

D. Radius

Answer Explanation:

One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.

Therefore, the Correct Answer is A.

Q #1: In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?

A. Triple point

B. Critical temperature

C. Absolute zero

D. Critical point

Answer Explanation

A phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. A phase diagram usually has pressure on the y-axis and temperature on the x-axis. As we move along the curves of the phase diagram, we can see how the state of the substance changes from solid to liquid to gas, or vice versa.
Q #2: Which of the following ions binds to the troponin complex, initiating contraction of a muscle?

A. Sodium

B. Potassium

C. Calcium

D. Phosphorus

Answer Explanation

When a muscle cell is stimulated by a nerve impulse, calcium ions are released from the sarcoplasmic reticulum into the cytoplasm. The calcium ions bind to the troponin complex, which is a protein that regulates the interaction between actin and myosin filaments. The binding of calcium to troponin causes a conformational change that exposes the binding sites for myosin on the actin filaments. This allows the myosin heads to attach to the actin and pull the filaments past each other, resulting in muscle contraction.
Q #3: 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.

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The measurement indicated by the line across the center of the cell is best referred to as which of the following?

More Questions on TEAS 7 Science

Q #1: In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and gaseous states of a substance exist simultaneously?

Answer Explanation

Q #2: Which of the following ions binds to the troponin complex, initiating contraction of a muscle?

Answer Explanation

Q #3: 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?

Answer Explanation

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