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Where does the energy that makes life possible come from? Humans obtain energy from three classes of fuel molecules: carbohydrates, lipids, and proteins.
- Cell Metabolism
Enzymes are protein catalysts that speed biochemical...
- Cell Metabolism
Both animal and plant cells contain mitochondria and plants have the additional energy factories called chloroplasts. The chloroplasts collect energy from the sun and use carbon dioxide and water in the process called photosynthesis to produce sugars.
Energy is a fundamental feature of life. Processes at the cellular level are the same whether they are in animals, plants, fungi, or bacteria. Living matter is made up of large molecules called proteins, which are assembled from some 20 amino acids.
Cells store sugar molecules as glycogen in animals and starch in plants; both plants and animals also use fats extensively as a food store. These storage materials in turn serve as a major source of food for humans, along with the proteins that comprise the majority of the dry mass of the cells we eat.
31 Οκτ 2023 · The primary source of energy for animals is carbohydrates, primarily glucose: the body’s fuel. The digestible carbohydrates in an animal’s diet are converted to glucose molecules and into energy through a series of catabolic chemical reactions.
Biological roles of the elements. A large fraction of the chemical elements that occur naturally on the Earth's surface are essential to the structure and metabolism of living things. Four of these elements (hydrogen, carbon, nitrogen, and oxygen) are essential to every living thing and collectively make up 99% of the mass of protoplasm. [1]
21 Νοε 2023 · The acronym CHNOPS is formed from the chemical abbreviations of the six most common elements found in living organisms. These elements are carbon, hydrogen, nitrogen, oxygen,...
