Molecular Structure
Molecular Structure - Related Videos
02:34
Molecular Structure and Acidity
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2025
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors. The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
03:05
Acid Strength and Molecular Structure
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2020
Binary Acids and Bases In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
02:54
Lewis Structures of Molecular Compounds and Polyatomic Ions
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2020
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined: Determine the total number of valence (outer shell) electrons. For cations, subtract one electron for each positive charge. For anions, add one electron for each negative charge. Draw a skeleton structure of the molecule or ion, arranging the atoms around a central atom. (Generally, the least electronegative element should be placed in the center.) Connect...
01:18
Structure of Benzene: Molecular Orbital Model
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2025
According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm). The carbon atoms also have an unhybridized 2p atomic orbital with one...
07:29
Determination of Molecular Structures of HIV Envelope Glycoproteins using Cryo-Electron Tomography and Automated Sub-tomogram Averaging
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Cited by 16 •
2011
The protocol describes a high-throughput approach to determining structures of membrane proteins using cryo-electron tomography and 3D image processing. It covers the details of specimen preparation, data collection, data processing and interpretation, and concludes with the production of a representative target for the approach, the HIV-1 Envelope glycoprotein. These computational procedures are designed in a way that enables researchers and students to work remotely and contribute to data...
FAQs
Connectivity and geometry contribute different information. Covalent bonds determine which atoms are linked, whereas bond angles and three-dimensional arrangement determine their spatial relationships. Those relationships can expose or hide chemically important regions, affecting how a molecule maintains its conformation and interacts with other molecules. This distinction is essential when linking a structural change to altered biological behavior.
Charge distribution and hydrogen bonding help stabilize particular conformations, while other noncovalent interactions can influence how molecular parts associate without changing covalent connectivity. Because these forces act within and between molecules, they affect both shape and interaction behavior. Examining them helps explain why a biological molecule adopts a functional form and how structural alterations may change its stability or binding.
The structural features of proteins, DNA, and lipids support different biological functions. Protein folding creates shapes that enable ligand binding and enzymatic activity, while DNA structure supports the storage and transmission of genetic information. Lipid organization enables cellular membrane formation. Comparing these molecular systems shows how distinct arrangements of atoms and interactions produce specialized biological behavior.
Structural analysis connects molecular form with biological function. It can help researchers examine how a protein folds, how a ligand fits or interacts with a binding site, or how a chemical or genetic change alters molecular behavior. These insights support interpretation of mechanisms in biology and help predict functional consequences rather than treating molecular changes as isolated events.
Molecular structure provides a framework for studying how proteins interact with ligands, which are molecules that bind to them. Features such as three-dimensional shape, charge distribution, and hydrogen bonding help explain these interactions. In drug design, analyzing such relationships can guide efforts to connect a candidate molecule’s structure with its biological activity and binding behavior.
In enzymology, structure helps relate protein folding and binding to biological activity. In genetics, DNA structure provides context for how information is stored and transmitted, while structural analysis can help assess the effects of genetic changes. Biotechnology uses these connections between form and function to study molecules, interpret altered behavior, and support the development of useful biological applications.