{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Chapter 17 (2)

Chapter 17 (2) - /11/09 No Spontaneous Generation(fig 17-1...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 17 11/11/09 No Spontaneous Generation (fig. 17-1) Broth in flask heated to kill preexisting microorganisms Condensing water collects, sealing the mouth of the flask If neck is broken, outside air can carry microbes into broth The Earth’s Age Earth is about 4.6 billion years old o Radiometric dating of meteorites & moon rocks Life arose about 3.8 billion years ago o Chemical traces in rocks – 3.8 billion years o Fossil bacteria in rocks – 2.5 billion years No spontaneous generation now, but must have happened then Radiometric Dating Potassium 40 ( 40 K) naturally decays to argon 40 ( 40 Ar) Aerobic metabolism is an advantage over anaerobic metabolism because the destructive chemical action of action is utilized to generate energy; aerobic respiration produces more energy than anaerobic respiration . What evidence suggests that eukaryotic cells formed symbiotic relationships with bacteria?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}