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Pyruvate pathways diagram showing glycolysis, citric acid cycle, and lactate production with all enzymes labeled
Biology

Pyruvate Pathways, Enzymes, and Cellular Energy Basics

Muscle fatigue during intense exercise happens when cells run low on oxygen. Pyruvate starts accumulating, and your body shifts to different reactions that allow muscles to keep working. This process produces lactate, which causes the familiar burning sensation and signals that cells rely on anaerobic energy production. This study guide explains how pyruvate forms in …

Gluconeogenesis pathway shows lactate, glycerol, and amino acids entering glucose production
Biology

Gluconeogenesis Process and Enzymes in Human Metabolism

When you skip meals or exercise for hours, your body runs low on carbohydrates. To keep working, it starts producing glucose from lactate, glycerol, and amino acids. This process takes place mainly in the liver and keeps blood sugar steady during fasting or intense activity. This study guide explains how gluconeogenesis creates glucose from non-carbohydrate …

NADH and NAD control metabolism by cycling between oxidized and reduced forms during ATP production and cellular respiration
Biology

NADH and NAD: Functions in Cellular Metabolism

When you cycle uphill or sprint, your muscles burn glucose and fats to release energy. Molecules inside your cells move electrons to produce ATP, which fuels every movement. One of the most important is Nicotinamide adenine dinucleotide (NAD), which changes form during these reactions and keeps energy production running. This study guide explains how NADH …

Cells rely on glycolysis to generate ATP, supporting respiration when oxygen is available or fermentation when not.
Biology

Glycolysis Process: How Cells Break Down Glucose to ATP

When you sprint, your muscles need energy fast. To keep up, your cells rapidly break down glucose into ATP, the fuel that powers movement. This process, called glycolysis, happens in all living cells, whether oxygen is present or not. Even yeast and bacteria rely on glucose breakdown to survive in low-oxygen conditions. This guide explaisystematically …

DNA polymerase builds new DNA strands, proofreads for errors, and ensures accurate DNA replication before cell division
Biology

DNA Polymerase in Eukaryotic and Prokaryotic Cells

DNA replication happens billions of times per second, ensuring every new cell gets an exact copy of genetic material. A single mistake in this process can lead to mutations, yet cells maintain accuracy through specialized enzymes. DNA polymerase builds new DNA strands, proofreads them, and corrects errors to keep genetic information intact. This study guide …

Mutation affects traits, disease risk, and evolution. The graphic shows point mutations, deletions, and chromosomal changes.
Biology

Mutation in DNA: Types, Causes, and Effects Explained

Bacteria develop antibiotic resistance through mutation, allowing them to survive drugs that once killed them. This genetic change spreads, making infections harder to treat. In humans, a mutation in the lactase gene allows some adults to digest milk, unlike most mammals. These genetic changes shape how organisms adapt and survive. A mutation is a permanent …

Antigen presentation by MHC molecules enables T cells to recognize infections and initiate targeted immune responses
Biology

Antigen Function: How Immune Cells Identify Foreign Molecules

Your immune system constantly scans for harmful invaders. How does it recognize them? Antigen acts as molecular fingerprints, allowing immune cells to distinguish between harmful and harmless substances. These molecules trigger responses that protect the body from infections and diseases. This guide explains antigens, how they interact with immune cells, and how B cells and …