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

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

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

Describe a sigmatropic rearrangement.

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

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

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

Which solution(s) would lead to a gain of water by the cell? (only water can move in or out of the cells)          

Triglycerides are major components of biological membranes. 

When an atom or molecule loses an electron that atom or molecule is said to be?   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