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formula sheet for biology, Cheat Sheet of Biology

Biology

This Biology Formula Sheet helps students revise important biological equations, processes, and key scientific facts in a simple and organized way. It includes formulas for magnification, BMI, pulse rate, population density, genetics probability, and important biological processes such as respiration and photosynthesis. It also covers food tests, blood circulation, the menstrual cycle, and important body facts like chromosome numbers and normal body temperature. These notes are useful for quick revision before tests, understanding biological processes, and improving accuracy in biology exam questions.

Typology: Cheat Sheet

2025/2026

Available from 04/19/2026

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BIOLOGY FORMULA SHEET
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
MICROSCOPE
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
Magni๏ฌcation
Magni๏ฌcation = Image Size / Actual Size
Actual Size
Actual Size = Image Size / Magni๏ฌcation
Image Size
Image Size = Magni๏ฌcation ร— Actual Size
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
BODY MASS INDEX (BMI)
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
BMI = Weight / Heightยฒ
BMI = kg / mยฒ
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
PULSE RATE
โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”
Pulse Rate
Pulse Rate = Number of Beats / Time (minutes)
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BIOLOGY FORMULA SHEET

MICROSCOPE

Magnification Magnification = Image Size / Actual Size Actual Size Actual Size = Image Size / Magnification Image Size Image Size = Magnification ร— Actual Size โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” BODY MASS INDEX (BMI) โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” BMI = Weight / Heightยฒ BMI = kg / mยฒ โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” PULSE RATE โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Pulse Rate Pulse Rate = Number of Beats / Time (minutes)

RESPIRATION

Aerobic Respiration Glucose + Oxygen โ†’ Carbon Dioxide + Water + Energy Cโ‚†Hโ‚โ‚‚Oโ‚† + 6Oโ‚‚ โ†’ 6COโ‚‚ + 6Hโ‚‚O + Energy Anaerobic Respiration (Humans) Glucose โ†’ Lactic Acid + Energy Anaerobic Respiration (Yeast) Glucose โ†’ Ethanol + Carbon Dioxide + Energy โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” PHOTOSYNTHESIS โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Photosynthesis Equation Carbon Dioxide + Water โ†’ Glucose + Oxygen 6COโ‚‚ + 6Hโ‚‚O โ†’ Cโ‚†Hโ‚โ‚‚Oโ‚† + 6Oโ‚‚ (Requires Light + Chlorophyll) โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” GENETICS โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Percentage Probability

Ethanol Emulsion Test โ†’ Milky White โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” MENSTRUAL CYCLE โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Average Cycle Length 28 Days Ovulation Usually around Day 14 โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” BLOOD CIRCULATION โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Double Circulation Heart โ†’ Lungs โ†’ Heart โ†’ Body Heart Rate Heart Rate = Number of Beats / Minute โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” IMPORTANT FACTS โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ” Normal Body Temperature 37ยฐC Normal Human Chromosomes

Pairs of Chromosomes 23 Pairs Red Blood Cells Life Span Approximately 120 Days