Cellulose is a type of carbohydrate, specifically a polysaccharide, that forms the structural component of plant cell walls. It is made up of long chains of glucose molecules linked together, providing strength and rigidity to plant cells. While cellulose is indigestible by humans and most animals due to their lack of enzymes capable of breaking it down, it serves as dietary fiber, aiding in digestion and promoting bowel regularity. Cellulose is found in high amounts in plant-based foods such as fruits, vegetables, whole grains, and legumes.

What is "cellulose"?

cellulose

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Fructose is a type of sugar, classified as a monosaccharide, that is naturally found in fruits, honey, and certain vegetables. It is known for its sweet taste and is often used as a sweetener in processed foods and beverages. When consumed, fructose is absorbed into the bloodstream and transported to the liver, where it is processed and converted into glucose or stored as glycogen for energy. While fructose can provide energy like other sugars, excessive intake, particularly from added sugars in processed foods, has been associated with negative health effects, including obesity, type 2 diabetes, and fatty liver disease.

What is "fructose"?

fructose

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Glucose is a type of sugar, known as a monosaccharide, that serves as the primary source of energy for the body's cells. It is found naturally in many foods, including fruits, vegetables, and grains, and is also produced by the body through the breakdown of carbohydrates. Glucose is absorbed into the bloodstream after digestion and is transported to cells throughout the body, where it is used for energy production. Excess glucose is stored in the liver and muscles as glycogen for later use. Maintaining stable blood glucose levels is essential for overall health, as fluctuations can affect energy levels, mood, and long-term health outcomes.

What is "glucose"?

glucose

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peptide

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carotenoid

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Enzymes are special proteins that speed up biological reactions in the body. They help reactions occur more quickly by reducing the amount of energy needed to start them. Enzymes are highly specific, meaning each enzyme typically activates only one type of reaction or a few closely related reactions. They play crucial roles in various bodily functions, including digestion, metabolism, and cellular processes. For example, digestive enzymes aid in breaking down food into smaller molecules that can be absorbed by the body, while metabolic enzymes assist in chemical reactions involved in energy production and the creation of essential molecules. Without enzymes, many vital biochemical reactions would happen too slowly to sustain life processes.

What is an "enzyme"?

enzyme

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proteome

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nucleotide

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Monosaccharides are simple sugars, which are the most basic form of carbohydrates. They consist of single sugar molecules that cannot be broken down further into smaller sugars. Common examples of monosaccharides include glucose, fructose, and galactose. These sugars are easily absorbed by the body and serve as a quick source of energy. Monosaccharides are found naturally in fruits, vegetables, and honey, and they are also added to processed foods as sweeteners. In addition to providing energy, monosaccharides play important roles in cellular processes and are essential for overall health and well-being.

What is a "monosaccharide"?

monosaccharide

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glutamate

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An antioxidant is a substance that possesses unique properties to counteract and neutralize harmful molecules called free radicals. Antioxidants can be naturally occurring or synthetic, and common examples include vitamins C and E, beta-carotene, and resveratrol. Antioxidants work by donating electrons to free radicals, thereby preventing or minimizing their damaging effects on cells. They are known for their potential health benefits, including protecting against chronic diseases, reducing inflammation, and promoting overall well-being. Antioxidants can be obtained through a balanced diet rich in fruits, vegetables, whole grains, and other sources known for their antioxidant content.

What is an "antioxidant"?

antioxidant

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Lipids are a diverse group of molecules that include fats, oils, and certain components of cell membranes. They are insoluble in water and primarily consist of hydrocarbons, including fatty acids and cholesterol. Lipids serve various essential functions in the body, such as providing energy, insulating and protecting organs, and serving as structural components of cell membranes. Types of lipids include triglycerides, phospholipids, and sterols. Triglycerides, found in fats and oils, are a major source of energy storage in the body. Phospholipids are crucial components of cell membranes, helping to maintain their structure and function. Sterols, such as cholesterol, are important for the production of hormones and vitamin D. While lipids are necessary for health, an imbalance or excessive intake of certain types, particularly saturated and trans fats, can contribute to health issues such as heart disease.

What is "lipid"?

lipid

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mitochondrial

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cytoplasm

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chlorophyll

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A membrane refers to a thin, flexible layer of tissue that covers, lines, or separates various structures and organs. These membranes serve diverse functions, such as protecting organs, providing structural support, facilitating movement and flexibility, and allowing for the exchange of substances. Examples of membranes in the human body include the mucous membranes that line the respiratory and digestive tracts, the serous membranes that encase organs in protective fluid-filled cavities, and the cell membranes that surround individual cells, regulating the passage of molecules. Membranes are essential for the proper functioning and integration of different body systems.

What is a "membrane"?

membrane

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Tissue refers to a group or collection of specialized cells that work together to perform a specific function. Tissues can be categorized into four main types: epithelial, connective, muscle, and nervous. Epithelial tissue forms protective barriers and linings, connective tissue provides support and structure, muscle tissue enables movement and contraction, and nervous tissue facilitates communication and electrical signaling. Tissues are the building blocks of organs and systems, playing a vital role in maintaining the body's structure, function, and overall homeostasis.

What is "tissue"?

tissue

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Golgi apparatus

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ribosome

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lysosome

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vacuole

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nucleus

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chloroplast

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cytoskeleton

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morphology

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intracellular

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organelle

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cambium

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Here you will learn some English words related to biochemistry and cell structure, such as "nucleus", "lipid", "enzyme", etc. that will help you ace your ACTs.

Mots anglais pour "Biochimie et structure cellulaire" | Vocabulaire ACT