Chapter 4
Biochemistry of the Cell
Composés essentiels au fonctionnement humain
The human body is composed of cells that are fundamentally made up of several different molecules. These molecules are essential to carry out all ...
Rôle de l’eau dans la biologie humaine
Water is the one of the most significant components of the human body; it plays a crucial role in several physiological activities because of its unique ...
Introduction aux électrolytes
In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their ...
Homéostasie du pH
Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because ...
Vue d’ensemble des groupes fonctionnels
Functional groups are a group of atoms with characteristic properties, which when linked to the carbon skeleton of a molecule, alter the properties of ...
Introduction aux glucides
Carbohydrates, proteins, and fats are the primary macronutrients in the human diet. However, carbohydrates are the most favored source of energy in the ...
Métabolisme des glucides
Carbohydrates are polymers composed of molecules containing atoms of carbon, hydrogen and oxygen. One gram of carbohydrate can provide four kilo-calories ...
Les sucres comme molécules de stockage d’énergie
Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living ...
Que sont les lipides ?
Lipids function as structural components of cellular membranes, in addition to acting as energy reservoirs and signaling molecules. They are thus crucial ...
Composés dérivés de lipides dans le corps humain
Fats and lipids are crucial components in the human body. Some lipid-derived compounds, such as fat-soluble vitamins, eicosanoids, lipoproteins, and ...
Les graisses comme molécules de stockage d’énergie
Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides ...
Que sont les protéines ?
Proteins are polymers of amino acids linked together by peptide bonds. Proteins and polypeptides are interchangeably used to refer to long chains of amino ...
Organisation des protéines
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular ...
Protéines globulaires
In organisms, proteins are the most abundant macromolecules. They act as the building blocks of life and play various crucial roles in the body. Proteins ...
Protéines fibreuses
Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of ...
Dénaturation des protéines
The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. ...
Rôle des protéines dans le corps humain
Proteins are the building block of life. They are also the most abundant macromolecules with as many diverse roles in the body. They are part of ...
Introduction aux enzymes
The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an ...
Enzymes et énergie d’activation
The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to ...
Introduction aux mécanismes de la catalyse enzymatique
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme ...
Acides nucléiques et nucléotides
Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its ...
Structure de l’acide nucléique
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group ...
Stockage et libération d’énergie ATP
ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free ...
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