Chapter 4 - Carbon and the Molecular Diversity of Life Flashcards
Living organisms consist mostly of ______-_____ compounds.
- carbon-based Proteins
- DNA
- carbohydrates
- molecules that distinguish living matter are all composed of carbon compounds.
Organic chemistry
the study of compounds that contain carbon.
Most organic compounds contain ________ atoms in addition to carbon atoms.
hydrogen
Vitalism
the idea that organic compounds arise only in organisms, was disproved when chemists synthesized these compounds. Stanley Miller’s classic experiment demonstrated the abiotic synthesis of organic compounds.
Mechanism
the view that all natural phenomena are governed by physical and chemical laws
With four valence electrons, carbon can form ____ covalent bonds with a variety of atoms.
four. Carbon is unparalleled in its ability to form large, complex, and diverse molecules.
In molecules with multiple carbons, each carbon bonded to four other atoms has a ____________ shape.
tetrahedral However, when two carbon atoms are joined by a double bond, the atoms joined to the carbons are in the same plane as the carbons.
Carbon chains
form the skeletons of most organic molecules. Carbon chains vary in length and shape. They can vary by:
- Length
- Branching
- Double bond position
- Presense of rings
Hydrocarbons
organic molecules consisting of only carbon and hydrogen. Many organic molecules, such as fats, have hydrocarbon components. Hydrocarbons can undergo reactions that release a large amount of energy.
Isomers
compounds with the same molecular formula but different structures and properties.
Structural isomers
Isomers that have different covalent arrangements of their atoms.
Cis-trans isomers (Geometric Isomers)
Isomers that have the same covalent bonds but differ in spatial arrangements. (On different sides than before)
- Cis isomer: The two Xs
are on the same side. - Trans isomer: The two Xs
are on opposite sides.
Enantiomers
are isomers that are mirror images of each other. Usually only one isomer is biologically active. Differing effects of enantiomers demonstrate that organisms are sensitive to even subtle variations in molecules.
Functional groups
the components of organic molecules that are most commonly involved in chemical reactions. The number and arrangement of functional groups give each molecule its unique properties.
The seven functional groups that are most important in the chemistry of life:
- Hydroxyl group
- Carbonyl group
- Carboxyl group
- Amino group
- Sulfhydryl group
- Phosphate group
- Methyl group