MARK TAKAHASHI: I'm Edmunds editor Mark Takahashi. And here's an Expert Rundown of the 2017 Ford Escape. The Ford Escape is a middle of the road choice among compact crossover SUVs. It does everything well without any particular high or low points.
Homologous Structures. A homologous structure is an organ, system, or body part that shares a common ancestry in multiple organisms. This definition is found in evolutionary biology, and uses the meaning of having a similar structure or origin.omologous Structures. A homologous structure is an organ, system, or body part that shares a common ancestry in multiple organisms. This definition is found in evolutionary biology, and uses the meaning of having a similar structure or origin.
Primary Structure (Peptide Bonds) The primary structure of a protein consists of amino acids chained to each other. Amino acids are joined by peptide bonds. A peptide bond is a type of covalent bond between the carboxyl group of one amino acid and the amino group of another amino acid. Amino acids themselves are made of atoms joined together by covalent bonds. Secondary Structure (Hydrogen Bonds) The secondary structure describes the three-dimensional folding or coiling of a chain of amino acids (e.g., beta-pleated sheet, alpha helix).