A little courage, a lot of learning.
During Grade 12, I started a small baking business and worked as a call center agent. Baking taught me patience and consistency; working taught me communication and resilience.
A STUDENT JOURNAL / PRELIMS 2026
Little molecules. A bigger dream.
My Biochemistry learning journey.
From molecules to medicine, and from
understanding movement to understanding life.

Understand the science.
Remember the patient.
Connect the two.
THE PERSON BEHIND THE JOURNEY
Hello, I’m
Aemie Cruz.
A Physical Therapy graduate, a small-business owner, an eldest child—and a future first-generation physician.
I am a BS Physical Therapy graduate from Pamantasan ng Lungsod ng Maynila, Class of 2026, originally from Pampanga. My journey has always involved balancing different responsibilities.
During the pandemic, while I was still a Grade 12 student, I started a small baking business while also working as a call center agent. These experiences taught me discipline, communication, patience, and perseverance.
As the eldest child in my family, I learned early to be responsible and independent. Today, I am continuing my journey in healthcare as a Year 1 medical student, working toward my dream of becoming a first-generation physician.
During Grade 12, I started a small baking business and worked as a call center agent. Baking taught me patience and consistency; working taught me communication and resilience.
At Pamantasan ng Lungsod ng Maynila, Physical Therapy taught me patient-centered care. I graduated in 2026, carrying that foundation into my next chapter.
Now a first-year medical student, I am working toward becoming a first-generation physician. Biochemistry is helping me connect the science with the person who needs care.
A CHANGE IN PERSPECTIVE
At first, Biochemistry felt like unfamiliar molecules, pathways, and terminology. Then the chapters began to connect. The symptoms and diseases we encounter clinically have molecular explanations.
Six chapters that began as separate topics
and slowly became one continuous story.
The molecular foundation of care.
Medicine begins deeper than a symptom: molecules, reactions, and processes inside the body. This chapter helped me understand why knowing what happens underneath a disease matters.
Molecular changes → cellular changes → organ dysfunction → clinical manifestations
The balance that makes life possible.
Water provides the environment where biochemical reactions happen. Hydrogen bonding, molecular interactions, and physiologic buffers helped me see why proper pH is essential for proteins and enzymes.
Water enables life, but pH keeps life in balance.
Small structures. Significant consequences.
The R group influences an amino acid’s properties and interactions. Joining amino acids through peptide bonds creates a sequence that influences a protein’s eventual structure and function.
The structure of a molecule determines how it behaves.
Reading a protein’s first story.
The amino acid sequence is more than a chain. Edman degradation, SDS-PAGE, mass spectrometry, and bioinformatics introduced me to how scientists identify and analyze proteins.
Structure gives us clues about what a protein can do.
It matters how the pieces come together.
A correct amino acid sequence is only part of the story. Proteins must fold and assemble correctly, from helices and sheets to tertiary and quaternary structures.
Protein misfolding connects molecular structure with disease.
The chemistry behind every breath.
Myoglobin stores and facilitates oxygen availability in muscle, while hemoglobin transports oxygen in red blood cells. Cooperativity, the Bohr effect, and hemoglobin disorders made the clinical connection clear.
Oxygen delivery is a biochemical process.
WHEN IRON IS NOT ENOUGH
Henry, a five-year-old boy, presented with pallor, fatigue, reduced exercise tolerance, and exertional shortness of breath. His anemia persisted despite a month of oral iron supplementation.
Normal iron studies, persistent microcytosis, target cells, and abnormal hemoglobin findings challenged my initial assumption of iron deficiency. The case pointed toward a problem involving globin synthesis.
“The chapters were no longer separate topics.
They were becoming one story.”
BIOCHEMISTRY × PHYSICAL THERAPY
Movement → muscle → nerve → function.
Molecules → proteins → cells → tissues → organs → function.
Medical school has reminded me that I will not understand everything immediately. There are concepts that take multiple readings, discussions, diagrams, and clinical examples before they finally make sense.
But I am learning not to measure my progress only through grades. I measure it through the moments when something that once seemed complicated suddenly becomes connected.
My journey from Physical Therapy graduate to medical student has taught me that healthcare requires both compassion and scientific understanding. Biochemistry is helping me build the scientific side of that foundation.
Integrating several ideas at once is still challenging. I want to keep using concept maps, diagrams, clinical cases, and active recall to strengthen those connections.
THE COMPLETE NOTEBOOK
Explore all 29 original pages.
The full reflections, connections, and little realizations.
My Biochemistry journey is only beginning.