Certain Growing Axons Are Prevented from Crossing the Midline by the _______

question 100

Multiple Choice

Certain growing axons are prevented from crossing the midline by the _______ action of the protein _______.

• A) chemoattractant; Semaphorin
• B) chemorepellent; Semaphorin
• C) chemoattractant; Slit
• D) chemorepellent; Slit

---

Definitions:

Economic Profits

The difference between a firm's total revenues and its total costs, including both explicit and implicit costs, representing the excess return over the firm's opportunity costs.

Purely Competitive Firm

A business that operates in a market with many buyers and sellers, where each has a negligible impact on price and product homogeneity prevails.

Unimpeded Entry

A situation in a market where there are no obstacles preventing new competitors from entering and competing.

MR = MC Rule

A principle in economics stating that profit maximization occurs when marginal revenue equals marginal cost.