The cytoskeleton of a cell is comprised of which of the following macromolecules?

A. Carbohydrates

B. Nucleic acids

C. Proteins

D. Lipids

Answer Explanation:

The cytoskeleton of a cell is a complex network of filaments and tubules that provides structural support, shape, movement, and organization to the cell and its components.

The cytoskeleton is composed mainly of proteins, which are macromolecules made of amino acids linked by peptide bonds. The three main types of proteins that form the cytoskeleton are microtubules, microfilaments, and intermediate filaments. Each type has a different structure, function, and distribution within the cell.

Therefore, the Correct Answer is C.

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 indicates the function of sodium bicarbonate released by the pancreas?

A. Sodium bicarbonate inhibits peristalsis.

B. Sodium bicarbonate stimulates the pyloric sphincter.

C. Sodium bicarbonate is a protease that digests carbohydrates.

D. Sodium bicarbonate neutralizes the acidity of chyme.

Answer Explanation

The pancreas releases sodium bicarbonate into the duodenum, the first part of the small intestine. The main function of sodium bicarbonate is to neutralize the acidity of chyme, the semi-digested food that comes from the stomach. By doing so, sodium bicarbonate creates a more alkaline environment that is suitable for the action of pancreatic enzymes. Sodium bicarbonate does not affect peristalsis, the rhythmic contraction of the intestinal muscles, nor does it stimulate the pyloric sphincter, the valve that controls the passage of food from the stomach to the duodenum. Sodium bicarbonate is not a protease, an enzyme that digests proteins, nor does it digest carbohydrates.
Q #3: Which of the following best describes the result of using a catalyst in a chemical reaction?

A. The reaction is completed in a shorter amount of time.

B. The yield of product is increased.

C. A greater amount of heat energy is released by the reaction.

D. A more desirable product is often formed.

Answer Explanation

A catalyst is a substance that lowers the activation energy of a chemical reaction, which means that it allows the reaction to proceed faster without being consumed or changed itself. A catalyst does not affect the equilibrium of a reaction, so it does not change the amount or the type of product that is formed.

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The cytoskeleton of a cell is comprised of which of the following macromolecules?

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 indicates the function of sodium bicarbonate released by the pancreas?

Answer Explanation

Q #3: Which of the following best describes the result of using a catalyst in a chemical reaction?

Answer Explanation

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