文档介绍：Section A - Introduction
1. What is Biochemistry?
2. The main features of the living matters
3. What are the questions for
biochemists to answer?
4. Cells and their structure
The study of the molecular basis of life or understanding life phenomena in chemical terms.
It is bination of biology and chemistry or the application of chemical principles to understanding biology.
1. What is Biochemistry?
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Diverse anisms
The Garden
Of Eden
Diverse anisms mon chemical features,
same basic structural units (cells) and same kinds of macromolecules.
Chemical Unity Underlies Biological Diversity
The same basic structrual units (Cells)
The same kinds of macromolecules (DNA, RNA, Protein)
The same kinds of monomeric subunits (Nucleotides, Amino acids)
The same pathways for synthesis of ponents
All Macromolecules Are Constructed from a Few pounds
Macromolecules:
(1) DNA: Deoxyribonucleic acids
A T C G
(2) RNA: Ribonucleic acids
A U C G
(3)Proteins
20 amino acids
(4)harides
Are Never at Equilibrium with Their Surroundings
anisms are not equilibrium with their surroundings. Death and decay restore the equilibrium. During life, the fish uses energy from food to plex molecules and to concentrate ions from the surroundings. When it dies, it no longer derives energy from food and thus cannot maintain concentration gradients; ions leak out.