Amino Acids

by Kevin Ahern, PhD

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    Proteins are part and parcel of what makes life possible. The diversity of the building blocks of proteins compared to other macromolecules give proteins a rich and diverse array of functions. In this lecture I will talk about proteins starting with the building blocks, the amino acids that make them up and divide them into various groups, essential or nonessential depending upon whether or not they can be made by the organism. I'll discuss the basic structure and stereochemistry of each amino acid and how the side chains of each amino acid give it the individual characteristics that it have. Last I'll give the properties and talk about the ionization of the amino acids found in proteins. Proteins, we can describe as the workhorses of the South. They perform all the essential functions that cells need to stay alive. These include catalysis, catalyzing of the reactions that happen, signaling the process whereby cells and part of an organism can communicate with cells in another part of the organism. The structure of proteins such as the fibrous proteins found in our hair and our nails arises from interesting features within individual protein molecules. Last, proteins are very important for the generation, creation and storage of energy. All proteins on earth are comprised of about 20 amino acids. The 20 amino acids are most commonly found in every organism on earth. A 21st amino acid known as Selenocysteine, in some cases found in a few rare proteins. Amino acids can be divided into various categories, one of the categorization schemes is divide amino acids into essential and nonessential groups, depending upon whether or not the organism can synthesize the amino acid within its cells. Essential amino acids are those amino acids that the cell needs to have in its diet because it...

    About the Lecture

    The lecture Amino Acids by Kevin Ahern, PhD is from the course Biochemistry: Basics. It contains the following chapters:

    • Structure of Amino Acids
    • R-Group Categories
    • Hydrophobic R-Groups
    • Hydrophilic & Ionic R-Groups
    • Ionization

    Included Quiz Questions

    1. ...amino acids.
    2. ...nucleotides.
    3. ...carbohydrates.
    4. ...fatty acids.
    5. ...carbon links.
    1. ...amino acids that we can not make but must get from the environment.
    2. ...amino acids that we must make from other amino acids we get from the environment
    3. ...amino acids that we can not make but must get from the bacterial flora of our GI tract.
    4. ...amino acids that are essentially in abundance in the environment.
    1. ...only cysteine contains a sulfhydryl group.
    2. ...only tyrosine lacks an aromatic ring.
    3. ...only serine contains a sulfhydryl group.
    4. ...only threonine lacks a hydroxyl group.

    Author of lecture Amino Acids

     Kevin Ahern, PhD

    Kevin Ahern, PhD

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    Loved it
    By myfit C. on 20. March 2017 for Amino Acids

    Couldn't ask for a clearer biochem video. Dr. Ahern is superb.

    This lecture was well rounded because all the subtopics were described in order of importance.
    By Sabrina M. on 07. January 2017 for Amino Acids

    The lecturer did a great job in going into detail where a student could have easily become confused or uncertain; furthermore, the lecturer was able to guide and connect ideas together in a reasonable amount of time which is great for understanding the bigger picture.

    Biochemistry 101 simplified (in a good way)
    By Austin M. on 03. January 2017 for Amino Acids

    Kevin is really good at explaining the concepts simply and effectively