The Most Abundant Molecule in Molecular Clouds Is

question 77

Multiple Choice

The most abundant molecule in molecular clouds is

• A)H₂.
• B)He₂.
• C)CO.
• D)H₂O.
• E)HHe.

---

Definitions:

Active Transport

The movement of substances across cell membranes against a concentration gradient, requiring energy input typically from ATP.

Diffusion

The process by which molecules move from an area of higher concentration to an area of lower concentration, contributing to the movement of substances within and between cells.

Osmotic Pressure

The pressure that needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.

Cytoplasm

The material within a living cell, excluding the nucleus, containing organelles in a fluid matrix.