🧠

MCAT Practice Questions Overview

May 27, 2025

View transcript

MCAT Practice Questions Lecture Notes

Introduction

  • Presenter: Eric
  • Mission: To simplify the MCAT for students.
  • Emphasis on preparation for the real test.

Overview of Questions

  • Focus on understanding key concepts and breakdowns of questions.
  • Sample questions discussed:
    • Question 14
    • Question 15
    • Question 16
    • Question 17

Question Breakdown

Question 14: Structure of Squalene

  • Squalene: A precursor for important compounds in the body.
  • **Key Concepts:
    • Terpenes are made from isoprenes.
    • Terpenes lead to cholesterol production.
    • Cholesterol is a precursor for steroid hormones.**
  • Elimination of Incorrect Answers:
    • Triglycerides: Structure includes glycerol and three fatty acids (no phosphate here).
    • Prostaglandins: Recognize by the five-carbon ring; low yield topic.
  • Correct Answer: (C) - indicates steroid hormones.

Question 15: Concentration of Cl- Ions in Calcium Chloride

  • Question: What is the concentration of Cl- ions in a 0.1 M solution of calcium chloride (CaCl2)?
  • Dissociation of CaCl2:
    • Dissociates into one Ca2+ and two Cl- ions.
    • Calculation:
      • Ca2+: 0.1 M
      • Cl-: 0.2 M (2 moles of Cl- per mole of CaCl2).
  • Analogy:
    • Bicycle analogy for understanding molarity during dissociation.
  • Correct Answer: 0.2 M concentration of Cl- ions.

Question 16: Disaccharide and Tollen's Reagent

  • Question: Which disaccharide does NOT form a shiny silver mirror in Tollen's test?
  • Key Concept: Tollen's reagent tests for reducing sugars.
  • Reducing Sugars: Must have a hemiacetal group (OH group connected to the anomeric carbon).
  • Identification of Sucrose:
    • Does not have a hemiacetal group, making it a non-reducing sugar.
  • Correct Answer: Sucrose (D).

Question 17: Net Charge of Peptide at pH 8

  • Peptide: Arginine, Alanine, Phenylalanine, Leucine.
  • pH=8: Considered neutral; treat similar to pH 7.
  • Net Charge Calculation:
    • Arginine: +1
    • Alanine: 0
    • Phenylalanine: 0
    • Leucine: 0
    • Total Net Charge: +1.

Conclusion

  • Encourage students to comment for further questions or topics for videos.
  • Highlight the importance of understanding and preparation for the MCAT.

Full transcript