3A_Biomolecules

Homeostasis** Definition- Organisms and living systems try to maintain equilibrium by adjusting its various processes, despite changing external environment.
 * 25/3/2010

Osmosis- when molecules move from a region of higher water potential to a region of lower water potential through a partially permeable membrane until it achieves equilibrium. Diffusion Active Transport Passive Transport
 * Cell membrane**

Definition Explanation Evidence - In cells, energy is generated in mitochondria to provide the necessary energy for cells to conduct the various processes, by using the glucose stored in lipids to produce ATP.
 * **Energy** is stored in the organization of matter

- Calcium in milk is used to build and maintain bones. - Proteins in milk is used to build and maintain muscles.
 * Living organisms use matter and energy to build and maintain body structures

In energy flow, energy can be lost in the form of heat energy. But energy cannot be destroyed. Energy can flow from one organism/ system to another. Energy can be converted into different forms of energy. Cycle of energy- water cycle and carbon cycle.

Why is the carbon molecule suitable for life as we know it? - because it can occurs in different forms with different physical and chemical properties. carbon has valency of 4 to bind with 4 other atoms, hence it can form a macromolecules out of the different molecules with different properties and functions. - has ability to combine with itself

Characteristics in water - 3 states - abnormal behavior - temperature drops below 40C