Cell Cycle Regulation — Tests Q1 Cell Cycle Regulation Test 1 ▾ Quiz Questions Question Palette ✕ Quiz ✕ Close Submit Test Question Palette Quiz ← Previous Next → Submit Test 📋 View Solution × Explanation: ✕ Close Solution ←…
Mitosis is the type of cell division that produces two daughter cells with the same number of chromosomes as the parent cell. It is used for growth, repair, and replacement of somatic cells. Mitosis has four main stages: Cytokinesis follows…
Every living organism grows, heals, and renews itself. This happens because individual cells know when to grow, copy their DNA, and divide. We call this orderly sequence the cell cycle. It is nature’s most reliable duplication system. It turns one…
The Bcl-2 family of proteins is the main controller of the intrinsic (mitochondrial) pathway of apoptosis. Every cell constantly receives two kinds of signals: ones that say “survive” and ones that say “die.” The Bcl-2 family weighs these signals and…
Apoptosis is a programmed, controlled form of cell death. The cell dies in a clean, silent manner without causing inflammation. It uses a group of enzymes called caspases to dismantle itself in an orderly way. There are two main pathways…
Apoptosis is a form of programmed cell death (PCD). It is regulated, caspase-dependent, and non-inflammatory. The cell dismantles itself in a controlled, orderly manner. Cellular contents are packaged into small vesicles called apoptotic bodies. These are quickly cleared by phagocytes…
Unlike apoptosis, necrosis is not a programmed or regulated process. The cell doesn’t receive a signal or activate a pathway. It simply fails. And in its failure, it triggers a chaotic inflammatory response that can cause massive secondary damage to…
Introduction: Why Cells Choose to Die It sounds like a contradiction. Why would a cell—a unit of life—meticulously plan and execute its own destruction? Yet, in multicellular organisms, controlled cell suicide is not only common; it is absolutely essential. This…
Mutations caused by chemical and physical mutagens are classified based on how they alter the DNA sequence. The two major types of base substitution mutations are transitions and transversions. A third category, frameshift mutations, involves insertion or deletion of bases…
We are exposed to radiation every day—from sunlight to medical X-rays. At the molecular level, this radiation can damage DNA and act as a physical mutagen. However, not all radiation works in the same way. Ionizing Radiation (X-Rays and Gamma…