AP Biology

Tetravalence

Carbon can form four covalent bonds, allowing complex molecule formation.

Diverse Bonding Capabilities

Carbon can form single, double, and triple bonds, enhancing organic molecule diversity.

Compatibility with Other Elements

Carbon readily bonds with hydrogen, oxygen, nitrogen, phosphorus, and sulfur.

Stable Frameworks

Carbon-to-carbon bonds are stable and versatile, supporting large biomolecules.

Proteins, DNA, and Carbohydrates

Major macromolecules for life composed of carbon structures.

Dehydration Reactions

Synthesis reactions that join monomers into polymers by removing water.

Hydrolysis

Breakdown of polymers into monomers by adding water.

Carbohydrates

Macromolecules that serve as energy sources and structural components.

Lipids

Compounds providing long-term energy storage and forming cell membranes.

Proteins

Biomolecules that function as enzymes, structural elements, and transporters.

Nucleic Acids

DNA and RNA molecules that store and transmit genetic information.

Impact of Changes in Organic Molecules

Alterations in macromolecules can significantly change their function.

Primary Structure of Proteins

The linear sequence of amino acids in a protein.

Secondary Structure of Proteins

Formation of alpha helices and beta-pleated sheets through hydrogen bonding.

Tertiary Structure of Proteins

The overall 3D shape of a protein from interactions among amino acids.

Quaternary Structure of Proteins

Arrangement of multiple polypeptide chains into a functional protein.

Protein Folding

Proteins achieve their functional shape through folding driven by interactions.

Denaturation of Proteins

Disruption of protein structure due to high temperature or pH changes.

Protons

Positively charged particles defining an element's identity.

Neutrons

Neutral particles that contribute to atomic mass.

Electrons

Negatively charged particles involved in chemical bonding.

Covalent Bonds

Strong bonds formed by sharing electron pairs between atoms.

Ionic Bonds

Bonds formed by the transfer of electrons, resulting in charged ions.

Hydrogen Bonds

Weak attractions between a hydrogen atom and another electronegative atom.

Van der Waals Interactions

Weak attractions due to temporary dipoles in molecules.

Cohesion of Water

Water molecules sticking to each other, aiding plant water transport.

Adhesion of Water

Water sticking to other surfaces, helping it climb narrow tubes.

High Specific Heat of Water

Water's ability to absorb large amounts of heat with minimal temperature change.

Expansion Upon Freezing

Ice is less dense than liquid water, allowing it to float.

Versatility as a Solvent

Water's polarity allows it to dissolve many substances, facilitating reactions.

pH Scale

Measures the hydrogen ion concentration in solutions.

Biological Buffers

Substances that minimize pH changes by absorbing or releasing hydrogen ions.

Carbon's Unique Properties

Carbon's tetravalency allows complex and diverse molecular structures.

Dehydration Synthesis

Joining of monomers into polymers by removing a water molecule.

Hydrolysis in Digestion

The process of breaking down polymers into monomers by adding water.

Carbohydrate Functions

Provide energy and structural support in living organisms.

Lipid Functions

Store energy, insulate, and form cell membranes.

Protein Functions

Catalyze reactions, transport substances, and provide structural support.

Nucleic Acid Functions

Store and transmit genetic information.

Protein Conformation

Proteins achieve their final shape through molecular interactions.

Consequences of Denaturation

Disruption of protein structure can lead to loss of function.

Amino Acid Sequence

Determines protein structure and function.

Hemoglobin

A functional protein that can be affected by a single amino acid change.

Sickle Cell Disease

Condition resulting from a single amino acid mutation in hemoglobin.

Structure-Function Relationship

The specific structure of macromolecules determines their function.

Biomolecule Diversity

Carbon skeletons vary to support diverse chemical properties.

Biological Macromolecules

Large molecules essential for life, including proteins, nucleic acids, and carbohydrates.

Hydrophobic Interactions

Interactions contributing to protein folding and structure.

Ionic Interactions

Forces that stabilize protein structures through charged side chains.

Disulfide Bridges

Strong covalent bonds that can stabilize protein structure.

Impact of Environmental Factors

High temperature and pH changes can denature proteins.

Homeostasis

The maintenance of stable internal conditions in living organisms.

Enzyme Activity

Function depends on the correct three-dimensional shape of proteins.

Biological Importance of Water

Water's unique properties are vital for life processes.

Molecular Framework of Life

Carbon's versatility underpins the diversity of biological molecules.

Nutrient Transport

Water facilitates the transport of nutrients in organisms.

Chemical Reactions in Cells

Involve the breaking and forming of chemical bonds.

Energy Storage in Lipids

Long-term energy is stored in lipid molecules.

Cell Membrane Structure

Phospholipids arrange into bilayers to form cell membranes.

Protein Functions in Cells

Include catalysis, structure, transport, and signaling.

Hydrogen Bonding in Water

Responsible for water's unique physical properties.

Diverse Molecular Structures

Result from carbon's ability to bond in various configurations.

Major Macromolecule Types

Include carbohydrates, lipids, proteins, and nucleic acids.

Sequence of Monomers

Dictates the properties of macromolecules.

Functional Groups in Organic Molecules

Specific groups of atoms that determine the properties of organic compounds.

Metabolic Processes

Involve energy transformations in biological systems.

Covalent Bond Formation

Determined by the sharing of electron pairs between atoms.

Organic Chemistry

The study of carbon-containing compounds.

Water's Role in Biochemical Reactions

Act as a solvent and reactant in biological processes.

Importance of Phospholipids

Key components of cell membranes.

Saturated vs. Unsaturated Fats

Differences in lipid structure affect their properties and function.

Polysaccharides

Carbohydrates formed by linking monosaccharides together.

Protein Denaturation Effects

Loss of protein function due to structural changes.

Molecular Biology

Focuses on the molecular basis of biological activity.

The Role of Nucleic Acids

In storing, transmitting, and expressing genetic information.

Importance of Amino Acids

Building blocks of proteins that define their structure and function.

Cell Structure and Function

Determined by the types of macromolecules present.

Bonds in Biological Molecules

Covalent, ionic, hydrogen, and van der Waals interactions contribute to structure.

Regulation of Biological Processes

Often involves enzymes and their substrates.

Monomers and Polymers

Monomers are building blocks, while polymers are long chains of monomers.

Biological Reactivity

The ability of a molecule to participate in chemical reactions.

Chemical Reactions in Digestion

Involve hydrolysis to break down food into nutrients.

Carbon-Based Life Forms

Life is built upon organic molecules primarily made of carbon.

Chemical Group Properties

Functional groups impart specific chemical characteristics to molecules.

Genetic Mutations

Changes in DNA sequence that can affect protein function.

Physiological Importance of Water

Regulates temperature and facilitates biochemical reactions.

Biomolecule Interactions

Molecules interact based on their structure and functional groups.

Catalysis in Biological Systems

Enzymes accelerate chemical reactions necessary for life.

Nutrient Metabolism

Includes all the biochemical processes that convert food to energy.

Proteins in Immune Response

Antibodies are proteins that help fight infections.

Role of Enzymes

Biological catalysts that speed up chemical reactions without being consumed.

Structure of DNA

Consists of two strands forming a double helix.

Evolution of Macromolecules

Macromolecules have evolved to perform diverse biological functions.

Molecular Basis of Heredity

Nucleic acids serve as carriers of genetic information.