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12.3 Origin of Life Objective Describe the conditions on Earth billions of years ago and summarize the hypotheses of how life began. • Objective Rubric 4. Student is able to describe the conditions on Earth billions of years ago and summarize the hypotheses of how life began and teach another student 3. Student is able to describe the conditions on Earth billions of years ago and summarize the hypotheses of how life began. 2. Student is able to describe the conditions on Earth billions of years ago and summarize one hypothesis of how life began with the use of notes/textbook 1. With help student is able to describe the conditions on Earth billions of years ago 12.3 Origin of Life KEY CONCEPT The origin of life on Earth remains a puzzle. 12.3 Origin of Life Earth was very different billions of years ago. • There have been many hypotheses of Earth’s origins. • The most widely accepted hypothesis of Earth’s origins is the nebula hypothesis. 12.3 Origin of Life Several sets of hypotheses propose how life began on Earth. • There are two organic molecule hypotheses. – Miller-Urey experiment electrodes “atmosphere” water “ocean” heat source – meteorite hypothesis amino acids 12.3 Origin of Life • There are different hypotheses of early cell structure. – iron-sulfide bubbles hypothesis 12.3 Origin of Life • There are different hypotheses of early cell structure. – lipid membrane hypothesis 12.3 Origin of Life • A hypothesis proposes that RNA was the first genetic material. – Ribozymes are RNA molecules that catalyze their own replication. – DNA needs enzymes to replicate itself. 12.3 Origin of Life Objective Describe the conditions on Earth billions of years ago and summarize the hypotheses of how life began. • Objective Rubric 4. Student is able to describe the conditions on Earth billions of years ago and summarize the hypotheses of how life began and teach another student 3. Student is able to describe the conditions on Earth billions of years ago and summarize the hypotheses of how life began. 2. Student is able to describe the conditions on Earth billions of years ago and summarize one hypothesis of how life began with the use of notes/textbook 1. With help student is able to describe the conditions on Earth billions of years ago