What type of cartilage makes up the tracheal rings that keep the trachea open?

A) elastic
B) hyaline
C) fibrocartilage
D) Tracheal rings are not made up of cartilage.

Which two structures are associated with the terminal bud?

A) apical meristem and leaf primordia
B) shoot tip and zone of maturation
C) apical meristem and zone of cell division
D) zone of cell division and leaf primordia
E) None of the answer choices is associated with the terminal bud.

Which of the following is a component of a nucleotide?

A) Adenine - a nitrogen base
B) Glucose - a monosaccharide
C) Cholesterol - a steroid
D) Calcium ions
E) ATP

Which of the following lung conditions is most likely to be cured?

A) advanced lung cancer with metastases
B) tuberculosis
C) asthma
D) emphysema
E) COPD

What is the role of the oxygen molecules required for aerobic respiration?

A) To form ATP
B) To produce CO₂
C) To accept electrons directly from either NADH or FADH₂
D) To accept the low energy electrons at the end of the electron transport chain
E) To store high energy electrons that are passed to complex I of the electron transport chain

Presently, it is thought that organic polymers may have formed and accumulated on:

A) silt and sand.
B) sand and mud.
C) rocks and clay.
D) water and shells.
E) sand and heavy metals.

Briefly explain what is meant by the phrase "coupling of chemical reactions." Provide an example to explain the importance of this process in living organisms.