Biology Chapter 4 4B-2 Metabolism and Homeostasis

Start-Up Answer the question on a yellow sheet of paper (paper on lab table by the door) Answer the question on a yellow sheet of paper (paper on lab table by the door) What are start codons and what are stop codons What are start codons and what are stop codons Turn in the answer and your homework to the “turn in” bin Turn in the answer and your homework to the “turn in” bin Objectves: Objectves: –Differentiate between anabolism and catabolism –Discuss the three types of cellular digestion

Let’s Read Let’s read Let’s read

Metabolic Rate Younger organisms have a higher metabolic rate Younger organisms have a higher metabolic rate Rate of metabolism is affected by environmental factors Rate of metabolism is affected by environmental factors Most organisms have an optimal temperature range for metabolism to occur Most organisms have an optimal temperature range for metabolism to occur

Anabolism and Catabolism Anabolism- The process that builds molecules and store energy Anabolism- The process that builds molecules and store energy Catabolism- The process that breaks down molecules and releases energy Catabolism- The process that breaks down molecules and releases energy Most cellular processes involve both processes Most cellular processes involve both processes

Let’s Read Cellular Digestion box on page 120 Cellular Digestion box on page 120

Cellular Digestion Intercellular digestion- The breakdown of substances within a cell Intercellular digestion- The breakdown of substances within a cell Extracellular digestion-The breakdown of substances that occurs on spaces outside the cells such as within the stomach or intestines Extracellular digestion-The breakdown of substances that occurs on spaces outside the cells such as within the stomach or intestines Autophagy- the process where a cell forms a membrane around some of its own cellular parts digest them Autophagy- the process where a cell forms a membrane around some of its own cellular parts digest them

Homework Using one sheet of paper, answer the review questions on one side and the self test on the second side Using one sheet of paper, answer the review questions on one side and the self test on the second side Review Tomorrow Review Tomorrow Test Thursday Test Thursday