What is due by 11 59PM Sunday night A Quiz 1 only B 3 Things I learned in BIO 151 only C Homework 1 only D Homework 1 and 3 things I learned E Quiz 1 Homework 1 and 3 things I learned First clicker question Set your clicker frequency to CC Announcements Login to the iClicker app and register your iClicker Complete the BioPrep Chemistry Biomolecules modules HW is open and due by Sunday night 11 59PM 3 things I learned this week Opens today at 10AM and closes First day of class survey syllabus quiz on Moodle Closes Monday Sunday at 11 59PM September 12 11 59PM Pretest on Moodle 2 pts extra credit By Wednesday 9 14 Office hours and discussion sections begin next week Our BIO 151 Team Graduate TAs Undergraduate TAs Julia Jamie Gabby Lily Grigely Olivia Mozoki Wyatt Tran William Ryan Yashri Mehta Emily Kim Kate Faucon Maitri Naik Peter Coufos Shri Sriprasad Shriya Shukla Shruthi Senthilkumar https i ytimg com vi uXdzuz5Q hs maxresdefault jpg Sexual assault is a big problem on college campuses I ve included links to these resources on Moodle I am glad you are here today Plasma Membrane Structure Fluidity Outline for today Brief overview of plasma membrane structure the fluid mosaic model Membrane fluidity temperature chain length chain saturation Which of the following is a phospholipid A B C D Set your clicker frequency to CC Which of the following is the best definition of amphipathic A Able to dissolve in water B Able to dissolve only in polar solutions C A molecule that can only mix with other non polar molecules D Contains both hydrophilic and hydrophobic parts E Belonging to the plasma membrane All cells have a plasma membrane A True B False Prokaryotic cells Eukaryotic cells https www toppr com ask content concept cell number and shape 200249 Plasma membrane structure https www khanacademy org science biology membranes and transport the plasma membrane a structure of the plasma membrane Semipermeable phospholipid bilayer some molecules can get through while others cannot Forms spontaneously biology stackexchange com questions 34679 why dont phospholipid bilayers dissolve cancurecancer org wp content uploads 2015 09 liposome png Fluid mosaic model Plasma membrane fluidity Temperature Cholesterol Types of fatty acids www biology pages info C Cholesterol gif Saturated vs unsaturated Long vs short Which of these factors external temperature cholesterol content and or types of fatty acids can be changed by cells A Cholesterol content only B Types of fatty acids only C Cholesterol content and types of fatty acids D External temperature and cholesterol content E External temperature cholesterol content and types of fatty acids Temperature Cholesterol Types of fatty acids www biology pages info C Cholesterol gif Saturated vs unsaturated Long vs short Plasma membrane fluidity More fluid Less fluid Wikimedia commons BioNinja https flavorpourfection com fewer molecular interactions more molecular interactions www quora com True or False As temperature increases membrane fluidity increases A True B False Cells regulate membrane fluidity to maintain homeostasis by adjusting membrane lipid composition Cholesterol Types of fatty acids www biology pages info C Cholesterol gif More fluid membrane more permeable Less fluid membrane more ridged stronger less permeable Homeostasis any self regulating process by which an organism tends to maintain stability So the organism can maintain a stable internal environment Usually involves negative feedback loops Low blood sugar tells pancreas to stop secreting insulin Starbucks com Blood sugar rises Insulin signals for cells to uptake take in glucose Blood sugar falls Pancreases secretes insulin into the blood Homeostasis of blood sugar levels Internal body temperature homeostasis https opentextbc ca biology2eopenstax chapter homeostasis Saturated no carbon carbon double bonds Unsaturated at least one carbon carbon double bond Butter saturated https flavorpourfection com Olive oil unsaturated Wikimedia commons Oleic acid fatty acid Steric acid Linoleic acid Which of the following statements is are true I II Linoleic acid is the only unsaturated Steric acid is unsaturated III Oleic and linoleic acid are both unsaturated fatty acids IV Oleic and linoleic acid are both saturated fatty acids A I only B II only C III only D IV only E I and IV Synechocystis is a genus of unicellular freshwater cyanobacteria Researchers mutated Synechocystis genes and these mutations caused a decrease in the percentage of unsaturated fatty acids in the plasma membrane compared to the wild type Los Murata 2004 Alchetron i y t i d u l f e n a r b m e M What happens to membrane fluidity temperature increases mutant decreases for the mutant A Membrane fluidity increases B Membrane fluidity decreases C Membrane fluidity increases for the wild type but D Membrane fluidity decreases for the wild type but increases for the mutant E Membrane fluidity doesn t change Synechocystis is a genus of unicellular freshwater cyanobacteria Researchers mutated Synechocystis genes and these mutations caused a decrease in the percentage of unsaturated fatty acids in the plasma membrane compared to the wild type Los Murata 2004 Alchetron i y t i d u l f e n a r b m e M What happens to membrane fluidity as the percentage of unsaturated fatty acids decreases A Membrane fluidity increases B Membrane fluidity decreases C Membrane fluidity increases up to a point and then mutant levels out D Membrane fluidity increases as temperature increases Why does having more unsaturated hydrocarbons in a plasma membrane increase membrane fluidity Think Pair Slack 1 Think of your answer to this question 2 Discuss it with your peers one person per group begin typing a group answer in Slack 3 Post your answer in Slack PC PG PE PA PS are different phospholipids Transition temperature is a way to measure membrane fluidity A higher transition temperature means a less fluid membrane What happens to membrane fluidity as the hydrocarbon chain length increases Less fluid More fluid Hydrocarbon chain length A Membrane fluidity increases as chain B Membrane fluidity decreases as chain length increases length increases C There is no relationship between membrane fluidity and chain length D The relationship between membrane fluidity and chain length is positive for some phospholipids but negative for others Changes to membrane Increase or decrease in membrane fluidity Why Longer hydrocarbon chains More saturated hydrocarbons In