Which of the Following Statements Is True

question 12

Multiple Choice

Which of the following statements is true?

• A) Within a boundary, chemical reactions occur among complex molecules.
• B) A source of energy is coupled to the chemical reaction sequence.
• C) As the pre-cell system continues to evolve, its size and organization decrease.
• D) The pre-cell system develops the ability to deduct.
• E) RNA often has catalytic properties; such enzymatic RNAs are called lysosomes.

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Definitions:

Pulmonic Valve

A heart valve located between the right ventricle and the pulmonary artery, regulating blood flow to the lungs.

Aortic Valve

A valve in the human heart between the left ventricle and the aorta that prevents blood from flowing back into the heart chamber after it has been ejected.

Cardiac Cycle

The sequence of events in the heart from the beginning of one heartbeat to the beginning of the next, encompassing systole and diastole phases.

Pericardium

The fibrous sac that encloses the heart, providing it with protection and a fixed position within the thorax.