The easier, more reliable way to learn and comprehend exactly what you need to know about biochemistry, including cellular and molecular biology, to feel confident on your exams and boards.


Biochem is challenging. Learning it doesn’t have to be.

Confused or overwhelmed by lectures and overly complex textbooks? If so, you’re not alone. That’s why the team behind First Aid created the high-yield Rx Bricks Cellular and Molecular Biology course to be a concise, interactive, and easy to understand way to learn biochem.

Gain a comprehensive understanding of Biochemistry—faster and easier than ever. We intentionally break down biochem’s need-to-know topics into digestible Bricks with interactive illustrations, mnemonic devices, clinical correlations, and case studies. This means you can absorb critical information more easily, connect this core material with real-world scenarios, and ace your exams with confidence.


Covering Every Concept You Need To Know

  • 45 Multimedia lessons called “Bricks”
  • Hundreds of Interactive Biochem Flashcards & Images
  • 200 Built-In Practice Questions
  • Outlined Learning Objectives and Summaries for Each Brick
  • Integration with USMLE-Rx and First Aid*

High-Yield Content

Each Brick contains an at-a-glance Summary of the most essential biochem information. Plus, measurable Learning Objectives at the beginning and end of each brick help you track your progress. And most can be covered in 20 minutes.


Interactive Flashcards

Reinforce your learning with interactive flashcards that help you retain more information.


Interactive Images

Quiz yourself as you learn using detailed, interactive images incorporated throughout each biochem Brick.


Built-In Practice Questions

At the end of each Brick, challenge yourself with built-in review questions. Each item explains exactly why the answer is correct and why the other choices are incorrect.


Biochemistry Course Overview

Close your learning gaps and deepen your understanding.

Cell Membranes 17 min
Cell Membrane Potential and Ion Balance 20 min
Transport Across Membranes 17 min
Protein Structure 22 min
Cytoskeleton 15 min


Nucleus 11 min
Mitochondria 11 min
Endoplasmic Reticulum and Golgi Apparatus 14 min
Cell Signaling 16 min
Homeostatic Mechanisms 12 min
Peroxisomes and Proteasomes 11 min
Glycolysis 30 min
Citric Acid (Krebs) Cycle 15 min
Electron Transport Chain 23 min
Pentose Phosphate Pathway 17 min
Glycogen Metabolism 14 min
Gluconeogenesis 14 min
Amino Acid Metabolism 16 min
Urea Cycle 13 min
Fatty Acid Metabolism 18 min
Nucleotide Metabolism 18 min
Ethanol Metabolism 9 min
Catecholamine Synthesis and Tyrosine Catabolism 12 min
Cholesterol 12 min
Lipoproteins 16 min
Primary Lipid Disorders 15 min
Glycogen Storage Diseases 15 min
Lysosomal Storage Diseases 15 min
Disorders of Fructose and Galactose Metabolism 14 min
Porphyrias 14 min
Cell Cycle 19 min
DNA Structure 12 min
DNA Replication 17 min
DNA Mutation and Repair 20 min
DNA Transcription and Translation 20 min
Epigenetics 11 min
Genetic Inheritance: Foundations and Frameworks 21 min
Mendelian and Non-Mendelian Genetics 18 min
Population Genetics 18 min
Chromosomal Translocations, Deletions, and Inversions 15 min
Autosomal Trisomies 17 min
Disorders of Sex Chromosomes 15 min
Trinucleotide Repeat Disorders 18 min
Genomic Imprinting Disorders 13 min
Cystic Fibrosis 16 min

Great! So how does it work?


Sign up to create your free USMLE-Rx account.


Select your free Biochem course in Rx Bricks and start studying today.


Download our mobile app so you can enjoy learning anywhere.


Your Free Account Brings Added Benefits that Never End

  • Unlimited access to the comprehensive Biochemistry (Cellular and Molecular Biology) Course in Rx Bricks
  • Unlimited access to the comprehensive General Microbiology Course in Rx Bricks
  • Unlimited access to Rx Bricks collections developed by MeSAGE (Medical Student Alliance for Global Education), covering critical issues such as health equity, diversity and inclusion, and the student as educator—with more coming soon
  • Unlimited access to more than 150 free high-yield, patient-centered learning Bricks from all Rx Bricks collections
  • Unlimited access from your desktop, tablet, or mobile device
  • Plus, get a free 5-day trial to our comprehensive study suite, Rx360+, with your free account

Learn anytime, anywhere. Even on the go.

Our easy to use app enables you to learn, review and assess your way through our comprehensive Biochemistry Course—anytime, anywhere.

Download the apps for free.

See what students are saying about the comprehensive courses in Rx Bricks:

“I usually find myself wanting to know more detail from the entries in First Aid and I’m usually always able to find the explanations in Bricks [courses]. The diagrams are excellent; they really help me visualize the concepts. The questions at the end are excellent to help test my understanding. Overall, I would recommend Bricks [courses] to my classmates because it’s easy reading and only the most pertinent information is left in, rather than textbooks which lose me with too much information.”

“It’s very well organized. And daunting topics are created in a very easy way to learn—and quickly!”

“It is the best. So much valuable information. Bricks is a concoction of Harrison, Robbins, Goodman & Gilman, Grey’s and many more books which I don’t have to spend hours reading because Bricks has made it so easy. I’ve started to love studying…which is a big achievement in itself.”

“It’s short, crisp and clear. No nonsense stuff, absolutely high yield. Love it.”

“Rx Bricks are amazing! They are organized so that, even if you don’t remember anything on a certain topic, you will be able to refresh your memory, fill in any gaps, and expand on the knowledge you already have. Having videos and links to the First Aid pages is unmatched. And finally, being able to look at flash cards and take practice questions on the covered topic, solidifies the information in your mind.”

“Rx Bricks remains the easiest to understand collection of high yield concepts for the USMLE exams I’ve come across.”

“Those who are just starting their journey for USMLE Step 1, I do highly recommend this because First Aid is an absolute essential, but oftentimes it gets quite boring and difficult to understand. First Aid tends to give information in a very few lines which sometimes needs more. So at that point, for strong basic understanding [Rx Bricks] is quite a great help. In addition to that, it provides audio clips and different histological and specimen images that often show up in examination.”


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