3: Chemistry of Life
- Page ID
- 184260
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Life is built from matter, and all matter is governed by the rules of chemistry. The chemistry of life (the study of how chemical substances and reactions make biological processes possible) explains how atoms combine to form molecules that support growth, energy use, reproduction, and homeostasis. Living organisms are composed primarily of a small set of elements, including carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur, which interact through chemical bonds to create the molecules necessary for life.
The structure and function of biological molecules depend on how atoms are bonded and how molecules interact with one another. Chemical reactions constantly build, break down, and rearrange these molecules, allowing cells to obtain energy, maintain organization, and respond to their environment. Understanding the chemistry of life provides a foundation for studying biology, biotechnology, and health-related sciences.
- 3.1: Atoms, Elements and Compounds
- This page covers the basics of atoms and elements, defining an element as a pure substance made of one type of atom characterized by its atomic number. It explains that atoms are neutral with equal protons and electrons, and discusses ions formed by electron transfer. The electromagnetic force attracts electrons to protons, and the nuclear force binds protons and neutrons in the nucleus.
- 3.2: Chemical Bonds
- This page details the essential features of chemical bonds and their significance in biological systems, covering covalent, ionic, and hydrogen bonds. It differentiates between hydrophobic and hydrophilic molecules and their interactions with water, which are crucial for biological structures like protein folding and cell membrane formation. The discussion underscores the vital role of chemical bonds in ensuring stability and functionality in living organisms.
- 3.3: Carbon
- This page emphasizes carbon's role in biological molecules through stable covalent bonds that allow for various macromolecules. It introduces functional groups—alcohols, carboxylic acids, aldehydes, ethers, esters, ketones, amines, and amides—detailing their characteristics and significance in biochemistry.
- 3.4: Organic and Inorganic Molecules
- This page explains that living organisms are made up of organic molecules, which contain carbon and form the basis of life, and inorganic molecules, which are essential for biological processes. Water is highlighted as the most abundant inorganic molecule, acting as a solvent for biochemical reactions.
- 3.5: Water
- This page discusses the essential role of water in life, making up 60-70% of human body mass and aiding in cellular structure, transport, and metabolism. Its polarity enables hydrogen bonding, allowing it to act as a powerful solvent for biochemical reactions. Water's various states and high heat capacity are crucial for climate regulation and biological stability.
- 3.6: Acids and Bases
- This page explains pH as a measure of hydrogen ion concentration, applicable in contexts like pool maintenance. It covers water dissociation into ions, the pH scale (0-14), and the implications of acidity and basicity. The significance of pH variations for biological processes, particularly in human cells and stomach acidity, is emphasized, highlighting the necessity of specific pH levels for sustaining life.
- 3.7: Transport Across Cell Membranes
- This page explains the mechanisms of transport across cell membranes essential for cellular function, including passive transport (diffusion and facilitated diffusion) and active transport (like the sodium-potassium pump). It also discusses bulk transport methods (endocytosis and exocytosis) for larger materials, and highlights osmosis's role in water regulation, categorizing environments as hypotonic, isotonic, or hypertonic based on solute concentration.
- 3.8: Macromolecules
- This page discusses macromolecules, essential large molecules crucial for life, classified into carbohydrates, lipids, proteins, and nucleic acids. These molecules provide structure, energy, and perform chemical reactions. Monomers bond to form polymers, with their sequence dictating function. Understanding macromolecules is important in biology and biotechnology, impacting drug design and genetic engineering, as their interactions at the cellular level are vital for life's processes.