Lecture3 - 01.15.10 Lecture 3 Cellular building Blocks...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
01.15.10 Lecture 3: Cellular building Blocks - Proteins
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Molecules in the cell Most essential molecules of the cell are known Pathways of synthesis and breakdown are known for most Chemical energy drives biosynthesis Organization of molecules in cells: 1. Atoms 2. Small molecules 3. Macromolecules 4. Supramolecular aggregates
Image of page 2
Atoms 95% of a cell’s dry weight is C (50%), O(20%), H (10%), N (10%), P (4%), S (1%) Na, K, Cl, Ca, Fe, Zn are each present at less than 1%.
Image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Small molecules (MW = 100 - 1000) Cells are 70% water, nearly 30% carbon compounds Molecules are covalently bonded atoms, covalent bonds result from sharing electrons and depend on valence (C: +4, N: -3, O: -2, H:+1)
Image of page 4
Covalent bonds Covalent bonds form the backbones of molecules. Electrons are shared between atoms Single bonds allow rotation, double bonds are rigid
Image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
There are four main classes of small molecules in cells Amino acids Subunits of proteins 20 major types of amino acids Side groups of amino acids dictate protein structure (non-polar, polar, and charged subgroups)
Image of page 6
Nucleotides Base (adenine, cytosine, thymosine, guanine, Uracil) + sugar + phosphate Subunits of DNA and RNA ATP - the main energy source There are four main classes of small molecules in cells
Image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
There are four main classes of small molecules in cells Sugars Monosaccharides (I.e.
Image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern