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Origin of life

Chapter 25 The History of Life on Earth

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Biology
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Biology
microbiology
Evolutionary biology
Cell Biology
RNA
Origin of life
Abiogenesis
organism
bacteria
Photosynthesis
cell
Prokaryote
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Chapter 25- Origin of life on earth The earth is estimated to have formed about 4.6 years ago condensing from a cloud of dust and rock. For the first few hundred millions years the Earth was being bombarded by huge chunks of rock and ice. The collisions created enough eat to vaporise the adavible water and prevent seas from forming. The early earth had a reducing atmosphere (electron adding) and there was no oxygen in the atmosphere, and as a result there was no need for an ozone layer to protect the earth from high levels of UV radiation.

Ch03-Macromolecules-OnlineQuiz

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Biology
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Chemistry
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Origin of life
RNA
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Amino acid
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11/8/13, 10:04 AMCh03-Macromolecules and the Origin of Life - Page 1 of 8http://qsg.qm4.qm3-assessments.bfwpub.com/q4/session.dll Ch03-Macromolecules and the Origin of Life completed Total score: 16 out of 20, 80% 1 of 20 Which of the amino acids listed below would, when incorporated into a polypeptide chain (not at the N- or C-terminus), make the charge of the polypeptide more positive? a. Alanine b. Arginine c. Aspartate d. Serine e. Cysteine 1 out of 1 Correct. Textbook Reference: 3.2 What Are the Chemical Structures and Functions of Proteins? p. 43 2 of 20 Nucleotides are composed of a. amino acids. b. nucleic acids. c. a phosphate, a sugar and a base. d. a base and phosphate. e. fatty acids and a base. 1 out of 1
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