Life science, which adds term to term and concept to concept,
If you understand it from a human-centered perspective, it becomes one story!

“Life science is a subject that you have to memorize from beginning to end.” Many people say this.
As time passes and I look back on the 'biology' or 'life science' I studied in high school, I feel like I memorized countless terms like I was memorizing English words.
However, even in high school subjects, the number of life science-related terms is not simply a few dozen.
In severe cases, it can be in the hundreds.
Will the terms and concepts memorized so haphazardly even stick in your head? Is there anything more futile than studying something that quickly fades from memory?

But even with countless terms, a story makes all the difference! The human brain evolved to remember "stories," so even when it comes to subjects requiring extensive memorization, memorizing them as stories significantly improves learning and facilitates long-term memory transfer! "A Biology Textbook You'll Never Forget Once You Read It" organizes terms and concepts related to life phenomena, which cannot be defined in a single formula, into stories.
It also tells an interesting story of life science using minimal concepts centered around ourselves, that is, 'humans'.
If you gave up on life science (biology) in the past because it was too difficult, or if you are thinking of giving up right now because studying it is too difficult, this book will help you find true enjoyment.

Mitochondria and chloroplasts in eukaryotic cells have their own DNA.
And both cell organelles are structures surrounded by double membranes.
Based on these characteristics, scientists speculate that mitochondria and chloroplasts may have originally been independent prokaryotes.
This means that bacteria that break down organic matter with oxygen (aerobic bacteria) enter other cells and become mitochondria, or bacteria that photosynthesize (cyanobacteria) enter other cells and become chloroplasts.
This phenomenon of cells living within other cells is called endosymbiosis.
--- "Chapter 1 Cell Biology"

These experimental results show that the substance that causes transformation is DNA.
In other words, the book that contained the instructions for 'making a membrane' was contained in the DNA of the S-type bacteria, and the R-type bacteria, which received this information, made the membrane themselves.
The efficiency of transformation may seem surprisingly low at 1-2%, but it is a very high number compared to genetic mutation.
The reason why only the S strain was detected in the bodies of the mice that developed the disease in Griffith's experiment was because the untransformed R strain was killed by the mice's immune system, and only the S strain that survived through transformation proliferated.
Avery's experiment was so important that it is introduced in high school textbooks today, and it is significant in that it revealed that the body of genes is DNA.

--- "Chapter 2 Molecular Biology"

In the autonomic nervous system, the sympathetic nerves mostly secrete norepinephrine, and the parasympathetic nerves mostly secrete acetylcholine, a neurotransmitter.
When a neurotransmitter binds to a receptor on a cell, a unique response occurs.
Therefore, by administering neurotransmitters or similar substances with a similar structure, it is possible to artificially induce the body's state when the autonomic nervous system is activated.
For example, eye drops used to dilate the pupil during fundus examinations contain chemicals that stimulate noradrenaline receptors.
And the anaphylactic shock adjuvant treatment known as the 'EpiPen' contains adrenaline, which is structurally similar to noradrenaline, and adrenaline acts on sympathetic nerve receptors to accelerate the heartbeat, increase blood pressure, and induce bronchial dilation.
--- "Chapter 3 Physiology"

The COVID-19 vaccine, which many people have already been vaccinated with, is an mRNA vaccine developed for the purpose of preventing COVID-19.
Here, we will learn about the principles of the COVID-19 vaccine.
To understand how the COVID-19 vaccine works, we must first understand how the novel coronavirus infects our bodies.
The surface of the novel coronavirus (hereinafter referred to as the 'virus') has countless protrusions called spike proteins.
When the virus infects a human cell, the spike protein binds to the ACE2 protein on the cell surface and uses this as a foothold to invade the cell.
So, if you put the key called the spike protein into the keyhole called ACE2, the door to enter the cell opens.
So if we could induce an immune response to make antibodies that block the spike protein from binding to ACE2, we might be able to prevent infection.
--- "Chapter 4 Immunology"

So, what position do we humans occupy in the ecosystem? Are we truly the creatures that reign supreme at the top of the food chain? Perhaps 10,000 years ago, when the population was smaller than today and humans lived a hunter-gatherer lifestyle, we could be considered members of the food chain.
But things have changed in modern times.
Our usual diet consists mostly of crops such as rice and wheat flour, and meat dishes such as beef and pork.
This is the result of repeated breeding of wild species for human consumption.
In other words, neither humans nor their food sources are species that make up the natural food chain.
So, to put it in the current context, perhaps we should say, “Humanity exists outside the natural food chain” or “Humanity is in the middle of a food chain that we have created to our advantage.”

--- "Chapter 5 Ecology"