Which set of molecular orbitals depict the symmetry of the HOMO and the LUMO in a 2p + 2p cycloaddition?

How many molecular orbitals are produced from the overlap of four p atomic orbitals?

Which of the following statements about a p* antibonding molecular orbital is true?  

Choose the correct ranking of the following dienophiles in decreasing order of reactivity in the Dies-Alder reaction.

Rank the following compounds in order of increasing reactivity diene in a Diels-Alder reaction, least reactive first?  

Which of the following statements concerning electrocyclic reactions is (are) correct?

Describe a sigmatropic rearrangement.

Which of the following represents the highest occupied molecular orbital for the conjugated pi system in excited state Vitamin D3?

The following reaction; undergoes a ________ ring closure to yield ________.

A bacterial capsule is an example of what structure?   Terms List acid active transport adenosine triphosphate (ATP) amphitrichous anabolic reaction anion bacteriology base buffer capsule carbohydrate catabolic reaction cation cell morphology chemotherapy chloroplasts cilia concentration covalent cytoplasm cytoskeleton cytosol decomposition dehydration diffusion disaccharide disulfide  electronegativity endergonic endocytosis endospores epidemiology ester etiology exchange exergonic exocytosis facilitated fimbriae flagella functional groups glycocalyces glycosidic Golgi body gram negative gram positive group translocation hydrogen bond hydrolysis hydrophilic hydrophobic hypertonic hypotonic immunology inclusions ionic bond isotonic lipid lipopolysaccharide  (LPS) lophotrichous lysosome metabolism microbiology mitochondria monomer monosaccharide monotrichous mycology non-polar covalent nucleic acid nucleotide nucleus osmosis parasitology passive transport peptide peptidoglycan peritrichous peroxisome phagocytosis phosphodiester phospholipids pilli (conjugation pili) pinocytosis polar covalent polymer polysaccharide protein protozoology ribosomes rough ER salts simple slime layer smooth ER solute solvent steroids surface tension synthesis tonicity triglycerides vacuoles vesicles virology