If a → B → C → D → E

question 68

Multiple Choice

If A → B → C → D → E represents a metabolic pathway, then the letter E would be

• A) a substrate.
• B) a product.
• C) energy.
• D) an enzyme.
• E) an enzyme-substrate complex.

---

Definitions:

Marine Invertebrate

Organisms without a backbone living in marine environments.

Freshwater

Water that contains minimal amounts of dissolved salts, found in rivers, lakes, streams, and groundwater, essential for drinking, agriculture, and habitat for many organisms.

Buoyancy

The upward force exerted by a fluid that opposes the weight of an object immersed in it, enabling the object to float or to seem lighter.

Internal Fertilization

The process in which the male delivers sperm into the body of the female (or close to the entrance of the reproductive tract).