BioArena

🧬 What happens inside a cell when it receives a signal to undergo programmed cell death?

Follow the complete Intrinsic Apoptosis pathway: Mitochondria → Cytochrome c → Apoptosome → Caspase 9 → Caspase 3, 6 & 7 → Apoptotic bodies → Phagocytic clearance.

A must know pathway for NEET, CSIR NET, and Biology students! 🔬

Save it for revision and share with your study partner!

🧬 Think you know MHC I & MHC II? Wait till you see the pathways!

From antigen processing to T cell recognition, this 3 part infographic breaks down MHC I vs MHC II in a crystal clear way. 🔬🧠

MHC I → Endogenous antigen → CD8+ T cells
MHC II → Exogenous antigen → CD4+ T cells

Save this for NEET, CSIR NET & Biology revision and share it with a biology lover! 🚀
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in 🐸 A tadpole doesn’t just grow—it transforms!
This amazing process is called metamorphosis, where major changes in body form occur during development. From aquatic tadpole → developing limbs → froglet → adult frog, watch the transformation happen in seconds! 🔬

Can you identify the nephron structure responsible for the counter current mechanism? 🧠 Answer: A) Loop of Henle. Its descending limb is permeable to water, while the ascending limb is impermeable to water and transports salts. Their opposite properties establish the medullary osmotic gradient, which helps the kidney concentrate urine.

Can you identify how cells repair UV induced thymine dimers? 🧬 Answer: B) Nucleotide excision repair. UV radiation creates thymine dimers that distort the DNA structure. NER recognizes and removes the damaged DNA segment, after which DNA polymerase fills the gap and DNA ligase seals the strand, restoring the DNA sequence.

🛡️ Before antibodies even enter the fight, your body already has a powerful defence system!

From skin and mucus → chemical barriers → phagocytosis and innate immune cells, the first line of defence works continuously to keep pathogens out and control infections.

🧬 3-part visual guide to the body’s first line of defence.

Save it for your NEET Biology revision!

🌊 or — do you know the difference?
They may belong to the same phylum, but their body forms, lifestyle, and role in the life cycle are completely different! From Planula → Polyp → Medusa, watch the fascinating cnidarian life cycle unfold. 🔬

Can you identify the precursor that leads to ethylene biosynthesis? 🌱 Answer: A) Methionine. In plants, methionine is converted to S adenosyl methionine, then to ACC, which is finally converted into ethylene. Ethylene is a gaseous plant hormone involved in fruit ripening, senescence, and several growth responses.