Characteristics of Life†

1. Organization: Being structurally composed of one or more cells — the basic units of life. 2. Growth and Development: Maintenance of a higher rate of anabolism than catabolism. A

growing organism increases in size in all of its parts, rather than simply accumulating matter. 3. Metabolism: Transformation of energy by converting chemicals and energy into cellular

components (anabolism) and decomposing organic matter (catabolism). Living things require energy to maintain internal organization (homeostasis) and to produce the other phenomena associated with life.

4. Homeostasis: Regulation of the internal environment to maintain a constant state; for example, electrolyte concentration or sweating to reduce temperature.

5. Adaptation: The ability to change over time in response to the environment. This ability is fundamental to the process of evolution and is determined by the organism's heredity, diet, and external factors.

6. Response to stimuli: A response can take many forms, from the contraction of a unicellular organism to external chemicals, to complex reactions involving all the senses of multicellular organisms. A response is often expressed by motion; for example, the leaves of a plant turning toward the sun (phototropism), and chemotaxis.

7. Reproduction: The ability to produce new individual organisms, either asexually from a single parent organism, or sexually from two parent organisms.

The Chemistry of Life†

1. Carbohydrates: are simple compound that produced in plants by photosynthesis. Also known as Saccharide which means sugar. Kinds of Carbohydrates:

a. Monosaccharide the most basic unit of biologically important carbohydrates. The monomer of Carbohydrates. (C6H12O6)

e.g. Glucose, Fructose, Galactose b. Disaccharide a kind of sugar consisting of two monosaccharides. (C12H22O11)

e.g. Maltose, Sucrose, Lactose c. Oligosaccharides are polymer saccharides with 3-10 of monosaccharides.

e.g. Raffinose, Chitin d. Polysaccharides are long carbohydrate molecules of repeated monomer units joined

together by glycosidic bonds. e.g. Starch, Glycogen, Cellulose

2. Lipids are broad group of naturally occurring molecules which includes fats, waxes, sterols, fat-soluble vitamins and others. Its major function is as energy source and for cell structures.

3. Nucleic Acid are biological molecules essential for known forms of life on this planet; they include DNA and RNA.

- Nucleotide is the monomer of nucleic acid. It has three parts the five carbon sugar, the nitrogen-containing base and 1-3 phosphate groups.

- The Nitrogen-containing base can be purines (adenine and guanine) or pyramidines (thymine, uracil and cytosine)

- Pairing of Nucleotides (A-U/A-T and G-C) 4. Protein are any of a large group of nitrogenous organic compounds that are essential

constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes.

- Amino Acids are the building blocks of protein. - There are 20 known amino acids. - The Central Dogma of Life: DNA RNA Protein

5. Water is a binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid.

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Jaycris C. Agnes The more you know the more amazing the world seems. STAY CURIOUS.