Which of the Following Planets Has an Average Density That

question 48

Multiple Choice

Which of the following planets has an average density that is less than that of liquid water?

• A) Uranus
• B) Saturn
• C) Neptune
• D) Mars
• E) Earth

---

Definitions:

First Messenger

A signaling molecule that binds to a receptor at the surface of a cell, initiating a series of intracellular events that lead to a biological response.

Acetylcholine

A neurotransmitter in both the peripheral and central nervous system that is involved in muscle activation, heart rate, and memory function.

Cyclic AMP

Cyclic AMP (cAMP) is a second messenger important in many biological processes, serving as a signaling molecule that transduces extracellular signals into cellular responses.

Signal Transduction

Signal Transduction is the process by which a cell converts one kind of signal or stimulus into another, involving a sequence of biochemical reactions inside the cell, which are carried out by enzymes and linked through second messengers.