292 - 29+ evidences for Macroevolution The Scientific Case...

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

View Full Document Right Arrow Icon
29+ evidences for Macroevolution The Scientific Case for Common Descent Nucleic acids are the genetic material of life Ten years after the publication of The Origin of Species , nucleic acids were first isolated by Friedrich Miescher in 1869. It took another 75 years after this discovery before DNA was identified as the genetic material of life (Avery et al . 1944 ). It is quite conceivable that we could have found a different genetic material for each species. In fact, it is still possible that newly identified species might have unknown genetic materials. However, all known life uses the same polymer, polynucleotide (DNA or RNA), for storing species specific information. All known organisms base replication on the duplication of this molecule. The DNA used by living organisms is synthesized using only four nucleosides (deoxyadenosine, deoxythymidine, deoxycytidine, and deoxyguanosine) out of the dozens known (at least 102 occur naturally and many more have been artificially synthesized) (Rozenski et al . 1999 ; Voet and Voet 1995 , p. 969). Protein catalysis In order to perform the functions necessary for life, organisms must catalyze chemical reactions. In all known organisms, enzymatic catalysis is based on the abilities provided by protein molecules (and in relatively rare, yet important, cases by RNA molecules). There are over 390 naturally occurring amino acids known (Voet and Voet 1995 , p. 69; Garavelli et al . 2001 ); however, the protein molecules used by all known living organisms are constructed with the same subset of 22 amino acids. The univeral genetic code
Background image of page 1

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

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

This note was uploaded on 11/14/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

Page1 / 3

292 - 29+ evidences for Macroevolution The Scientific Case...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online