Which of the Following Substances Would Have the Most Trouble

question 2

Multiple Choice

Which of the following substances would have the most trouble crossing a biological membrane by diffusing through the lipid bilayer?

• A) O₂
• B) CO₂
• C) Na⁺
• D) a small, nonpolar molecule such as butane (C₄H₁₀)

---

Definitions:

Dominant Gene

a gene that suppresses the expression of its allele, resulting in its trait being manifested in the organism.

Brown Eyes

A physical trait characterized by the presence of melanin in the iris, resulting in a brown coloration of the eyes.

Dominant-Recessive Genes Principle

A genetic principle in which the dominant allele masks the effect of a recessive allele in heterozygous pairs.

Dominant Gene

A genetic sequence that overpowers and determines the expression of a trait over another allele.