BIO E105 Lecture 3: Bio E105 Class 3

• School: HCC
• Department: Biology
• Course: BIO E105
• Professor: Munk

Document Summary

Proteins are crucial to most tasks required for cells to exist: within the cell. structures. control molecular movement into and out of the cell. Catalysis enzymes speed up chemical reactions. Defense antibodies and complement proteins attack pathogens. Movement motor and contractile proteins move the cell or molecules. Signaling proteins convey signals between cells. Structure structural proteins define cell shape and comprise body. Transport transport proteins carry materials; membrane proteins. Secondary structure: hydrogen bonds between the carbonyl group of one amino acid and the amino group of another form a protein"s secondary structure. A polypeptide must bend to allow this hydrogen bonding, forming: sheets: secondary structure depends on the primary structure. Some amino acids are more sheets: the large number of hydrogen bonds in a protein"s secondary structure increases its likely to be involved in others, in stability. Tertiary structure: the tertiary structure of a polypeptide results from interactions between r-groups or between.