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NEET Biology High-Yield Mnemonics & Key Facts

Essential mnemonics, classifications, hormone functions, and genetic principles for NEET UG Biology.

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Phases of Cell Cycle Interphase Mnemonic

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Phases of Cell Cycle Interphase Mnemonic

G1 → S → G2 → M (Growth 1, DNA Synthesis, Growth 2, Mitosis).

Stages of Prophase I in Meiosis

LZPDD: Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis. Crossing over occurs in Pachytene.

Essential Amino Acids Mnemonic

PVT TIM HaLL: Phenylalanine, Valine, Threonine, Tryptophan, Isoleucine, Methionine, Histidine, Leucine, Lysine.

Taxonomic Hierarchy Order

Keep Pond Clean Or Fish Get Sick: Kingdom, Phylum, Class, Order, Family, Genus, Species.

Cranial Nerves Sensory vs. Motor Mnemonic

Some Say Marry Money But My Brother Says Big Brains Matter More (S = Sensory, M = Motor, B = Both).

Plant Kingdom: Non-Vascular vs. Vascular

Bryophytes = Non-vascular (mosses, liverworts). Pteridophytes, Gymnosperms, Angiosperms = Tracheophytes (vascular).

Monocot vs. Dicot Floral Symmetry

Monocots: Trimerous (multiples of 3), parallel venation. Dicots: Tetramerous/pentamerous (multiples of 4 or 5), reticulate venation.

Blood Clotting Factors Cascade Catalyst

Thrombokinase activates Prothrombin → Thrombin in the presence of

Ca^{2 +}

. Thrombin converts Fibrinogen → Fibrin mesh.

Adrenal Cortex Layers Mnemonic

GFR (from outside to inside): Zona Glomerulosa (mineralocorticoids), Zona Fasciculata (glucocorticoids), Zona Reticularis (androgens).

Mendelian Dihybrid Phenotypic Ratio

9 : 3 : 3 : 1

in t h e

F_2$ generation for two independently assorting unlinked heterozygous genes.

DNA Start and Stop Codons

Start: AUG (codes for Methionine). Stop: UAA, UAG, UGA (nonsense codons, no tRNA).

Central Dogma of Molecular Biology

DNA Transcription mRNA Translation Protein

$ Reverse transcription occurs in retroviruses via reverse transcriptase.

Photosynthesis: Light Reactions Products

ATP, NADPH, and molecular oxygen (

O_{2}

) generated via photolysis of water in PSII.

Calvin Cycle (

C_{3}

pathway) Key Enzyme

RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase), the most abundant protein on Earth.

First Stable Product of

C_{4}

Photosynthesis

Oxaloacetic acid (OAA), a 4-carbon organic acid synthesized in mesophyll cells via PEP carboxylase.

Krebs Cycle Net Yield per Glucose Molecule

2 ATP + 6 NADH + 2 FADH_{2} + 4 CO_{2}

(from two turns of the TCA cycle per glucose).

Layers of the Human Gastrointestinal Tract

From outer to inner: Serosa → Muscularis → Submucosa → Mucosa.

Juxtaglomerular Apparatus (JGA) Hormone

Renin, released in response to decreased glomerular blood flow/pressure to activate the RAAS pathway.

Sliding Filament Theory: Tropomyosin Role

In relaxed muscle, tropomyosin covers actin active binding sites.

Ca^{2 +}

binds Troponin C, unmasking myosin-binding sites.

Immune Response: Antibodies Secreted by

Plasma B cells. IgA in secretions/colostrum; IgG crosses placenta; IgE mediates allergic hypersensitivity.

Ecological Pyramids that are Always Upright

Pyramid of Energy is always upright because energy is lost as heat (

10%

rule) across trophic levels.

Biochemical Oxygen Demand (BOD) Significance

High BOD indicates severe organic water pollution and low dissolved oxygen available for aquatic fauna.

Restriction Endonucleases Cutting Mechanism

Cleave phosphodiester bonds at specific palindromic DNA sequences, producing sticky or blunt ends for recombinant DNA vectors.

Hardy-Weinberg Equilibrium Equation

p^{2} + 2 pq + q^{2} = 1 and p + q = 1

w h er e

an d

q$ are allele frequencies.

Oogenesis Product vs. Spermatogenesis

Spermatogenesis produces 4 functional sperm. Oogenesis yields 1 functional ovum and 2-3 degenerate polar bodies.

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