Life Processes All living organisms carry out the following life processes to maintain homeostasis.

Nutrition The obtaining and processing of food and materials. There are three parts to nutrition Ingestion- taking in food Digestion- breaking food down Egestion- getting rid of solid waste

Transport The intake and distribution of materials throughout the organism Ex: Circulatory System Two organelles used for cell transport are: Cell Membrane Endoplasmic Reticulum

Respiration Organisms obtain their energy by releasing the chemical energy stored in certain nutrients. Ex: Mitochondria C6H12O6 + O2 CO2 + H2O + ATP

Excretion The removal of metabolic wastes Ex: Sweating, salts, urea Ex: Water and Carbon Dioxide

Synthesis The combining of simple substances to form more complex ones. Putting two things together Ex: Enzymes

Assimilation The incorporation of materials into an organism’s body. Ex: Absorption,Phagocytosis, Pinocytosis

Regulation The response of an organism to a changing environment in order to maintain homeostasis. Ex: Diffusion Osmosis Active/Passive Transport

Growth The increase in size of a cell or organism Ex: Mitosis

Reproduction The ability of living things to produce more of their own kind Ex Asexual and Sexual Reproduction

Metabolism All the chemical reactions that occur within the cells of an organism Ex: Cell respiration Photosynthesis- Plants

Key Words for Life Processes Life Function Key Word! Nutrition, Ingestion, Egestion, Digestion: Obtaining, Processing, Food Transport Intake, Distribution Respiration Obtain energy Synthesis Combine Assimilation Incorporation Growth Change in size, Bigger, Smaller Excretion Removal, Metabolic Wastes Regulation Maintain, Homeostasis, Coordinated Response Reproduction Produce more organisms Metabolism Chemical reactions in cells Locomotion Movement

1. Stained yeast were added to a paramecium culture, and some of the yeast were ingested by the paramecia. This activity is most closely associated with which life function? A. synthesis B. regulation C. nutrition D. growth

2. The life function of transport in an organism directly involves those activities used to A. absorb and distribute materials B. obtain and hydrolyze materials C. release energy from food D. produce cellular waste products

3. Which term includes all the activities required to keep an organism alive? A. growth B. excretion C. metabolism D. nutrition

4. Small molecules are combined to form large molecules by the life function of A. regulation B. excretion C. transport D. synthesis

5. Excretion is best described as the removal of A. metabolic wastes from a cell B. toxic wastes by the process of cyclosis C. water molecules from dipeptide hydrolysis D. undigested material from the digestive tract

What is the lowest possible magnification that can be obtained using the microscope shown? A. 20x B. 200x C. 40x D. 800x

2. A student views some cheek cells under low power 2. A student views some cheek cells under low power. Before switching to high power, the student should A. adjust the eyepiece B. center the image being viewed C. remove the slide from the stage D. remove the coverslip

3. A student changes the objective of a microscope from 10x to 50x 3. A student changes the objective of a microscope from 10x to 50x. If this is the only change made, what will happen to the field of view? A. Its diameter will decrease. B. Its diameter will increase. C. Its brightness will increase. D. Its brightness will remain the same.

6. Base your answer on the diagram of a microscope and on your knowledge of biology. While viewing a specimen under high power, a student noticed that the specimen was out of focus. Which part of the microscope should the student use to obtain a clearer image? A B C D

7. Base your answer on the diagram of a microscope and on your knowledge of biology. The highest possible magnification that can be obtained when using this microscope is A. 40x B. 100x C. 400x D. 4,000x