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Which of the following statements best describes the function of erythropoietin in the human body?

A. It aids in lowering oxygen levels in the blood.

B. It aids in raising levels of clotting factors in the blood.

C. It aids in raising hemoglobin levels in the blood.

D. It aids in lowering CO2 levels in the blood.

Answer Explanation:

Erythropoietin is a hormone that is produced by the kidneys and stimulates the production of red blood cells in the bone marrow. Red blood cells contain hemoglobin, a protein that binds to oxygen and transports it to the tissues. Therefore, erythropoietin helps to maintain adequate oxygen levels in the blood and prevent anemia.

Therefore, the Correct Answer is C.

Q #1: Which of the following summarizes a change that takes place as a solid turns to a liquid?

A. Particles become less ordered.

B. Intermolecular forces between particles become stronger.

C. Particles move closer together.

D. Particles have a decrease in mobility.

Answer Explanation

When a solid turns into a liquid during the process of melting, the particles within the solid gain enough energy to overcome the attractive forces holding them in a fixed arrangement. As a result, the particles become less ordered and more mobile, transitioning from a rigid structure to a more fluid state.
Q #2: To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

A. Filtration

B. Spectrophotometry

C. Titration

D. Electrophoresis

Answer Explanation

One of the most common techniques for separating DNA fragments by size is electrophoresis. Electrophoresis is a process that uses an electric field to move charged molecules through a porous gel matrix. The gel acts as a sieve, allowing smaller molecules to move faster and farther than larger ones. By applying a dye to the DNA samples and loading them into wells at one end of the gel, the DNA fragments can be visualized as bands after electrophoresis. The distance of each band from the well indicates the size of the corresponding DNA fragment.
Q #3: Which of the following vessels carries oxygenated blood?

A. Pulmonary vein

B. Pulmonary artery

C. Superior vena cava

D. Inferior vena cava

Answer Explanation

The pulmonary vein is the only vessel in the list that carries oxygenated blood. The pulmonary artery carries deoxygenated blood from the heart to the lungs, where it gets oxygenated. The superior and inferior vena cava are large veins that carry deoxygenated blood from the upper and lower body, respectively, to the heart.

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