{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Life Science 2 lecture 4

Life Science 2 lecture 4 - Life Science 2(lecture 4 I The...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Life Science 2 (lecture 4) I. The Components of cell membranes II. Connecting Cells Together III. Moving molecules in and out of cells -------------------------------------------------------------------- I. The Components of cell membrane Cell membrane --> All cells: plants, animals, other eukaryotes, all prokaryotes It functions as a selective barrier. Lipid components of plasma membranes Cholesterol: tends to regulate fluidity in the membrane; control the flexibility of the membrane Membranes have many proteins: integral membrane proteins and peripheral membrane proteins Protein functions in the plasma membrane 1. Transport channels 2. Passing signals from outside cell to the inside 3. Enzyme catalysis (hold different polypeptides together in cell membrane to make functional protein) Beta blockers reduce high blood pressure relieve migraine headaches reduce symptoms of anxiety How? - it binds to plasma membrane proteins that serve as adrenaline receptors --> blocks their functioning Membrane defects can cause disease: Cystic Fibrosis Most common fatal genetic disease of caucasians: 1 in 35 possess at least one copy of the defective gene half die before mid-twenties The bad gene results in a defective chloride channel o leads to buildup of chloride ions in lung cells o causes water to move in via osmosis o removing water from surrounding mucus thickens it, makes breathing hard How do we know tht membrane proteins drift around?
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
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