Most of the Cells Molecules Can Be Classified as Belonging to

Large Molecules Problem Fix

Problem two: Identification of biological molecules

Tutorial to help answer the question

The structure on the left is a(n) _________________, and the structure on the right is a(due north)_________________.

Tutorial

There are iv major classes of small biological molecules establish in cells. These are carbohydrates, lipids, amino acids, nucleotides. The different classes of compounds tin be identified past their characteristic structural features.

Carbohydrates

1. Carbohydrates can exist either a unmarried sugar (monosaccharide) like glucose, a disaccharide similar sucrose, or a series of monosaccharides linked together by glycosidic bonds.
   
2. Mutual monosaccharides in cells accept four, 5, or half dozen carbon atoms, and multiple, polar -OH groups.
   
3. In common sugars, the ratio of C, H, and O is ane:2:1.
   
4. Common v and half-dozen carbons sugars ordinarily exist equally 5- or six-membered ring structures in cells, with one oxygen atom in the ring.
   
5. The abundance of -OH groups, the one:2:1 ration of C:H:O, and the ring construction with an O cantlet in the ring are central features to use in identifying carbohydrates.

Lipids

1. Lipids or fats are characterized past their insolubility in h2o and solubility in organic solvents or detergents.
   
2. Lipids are the near efficient energy storage molecules in cells.
   
3. Near of the structure of lipids is very non-polar, formed almost exclusively of carbon and hydrogen atoms.
   
4. Triglycerides, used for energy storage in adipose (fat) tissue, are composed of a glycerol molecule condensed with three fatty acids. Fatty acids take long, hydrophobic tails consisting mostly of repeats of -CH₂- groups.
   
5. Diglycerides, which occur in jail cell membranes, are equanimous of a glycerol, usually two long fat acrid bondage, and a more hydrophilic "caput" group.
   
6. The presence of long, hydrophobic fatty acrid bondage is a cardinal feature to use in identifying many important lipids.

Amino Acids

1. Amino acids are the building blocks of proteins.
   
2. As shown in the diagram, amino acids have a generalized structure, including an amino grouping, carboxyl grouping, and variable side chain designated every bit the R-group.

   

3. There are xx unlike amino acids used to make proteins. They differ from each other in the structure and property of the R-groups, which may be polar and charged, polar and uncharged, or hydrophobic.
   
4. To place an amino acid, look for the generalized structural features.

Nucleotides

1. Nucleotides are the edifice blocks of RNA and DNA.
   
2. They are formed from a 5-carbon sugar (ribose or deoxyribose), a phosphate group, and a nitrogenous pyrimidine or purine base. The pyrimidines are 6 membered rings with 2 nitrogen atoms in the ring. The purines are a 6 and a v membered ring fused together, with iv ring nitrogen atoms.
   
3. To place a nucleotide, look for the saccharide-phosphate portion linked to a complex ring containing nitrogen atoms in the ring.

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