Pre-activity Assignment and Assessment Activity: “Cell Engineers and Cell Detectives” Post-activity Assessment – Assessment • • • – Ask “detectives” to guess the function of the mystery cell, and explain why. Ask “engineers” to respond. Encourage discussions and clear up any misconceptions Mini lecture • Mesophyll cells (photosynthesis) vs. storage cells – • Goblet cells vs. neuronal cells – – Both have (different types of) plastids Both have extensive ER/Golgi (one for secretion, one for making membrane) Clicker activities • Guess the functions of a series of cell types with specific organelle contents and structural features Conclusions and Perspectives – – Linking micro (organelles and cell function) and marco (organism level) Inspire students to think about bigger questions • • • How are cells different (differentiation) How does one cell (zygote) make different cell types following a spatial and temporal program (development) How have all these cell types come into being (evolution) What does a photosynthetic plant cell look like? http://www.uri.edu/cels/bio/plant_an atomy/images/01.gif – – https://faculty.unlv.edu/schulte/Anatomy/Leaves/PrivetLeaf.jpg Individual cells: high chloroplast content and other features Working together: difference between two major types of mesophyll cells What do these cells do? Avocado Potato http://www.emc.maricopa.edu/faculty/farabee/biobk/amyloplast.jpg – They also contain numerous plastids • – http://nickrentlab.siu.edu/PLB400/Peterson_Images/ Persea_Lipid.jpg Same type of organelle as chloroplasts What do they do? What does a goblet cell look like? http://www.baileybio.com/plogger/images/anatomy___physiology/12. _powerpoint_-_digestive_system/goblet_cell.jpg http://www.bio.davidson.edu/people/kabernd/BerndCV/Lab/Ep ithelialInfoWeb/goblet cells .jpg – High abundance of ER and Golgi – A trans Golgi apparatus cisterna is converted to mucinogen granules every 3 to 4 minutes during active secretion What do these cells do? http://www.columbia.edu/itc/hs/medical/sbpm_histology_old/micrographs/15.jpg http://cdn.head-fi.org/b/b0/200x200px-ZCb0c4ee5f_ChkNFH-neuron1.jpg – High abundance of ER and Golgi – What do they do? Clicker Time!! What do these cells do? Fiber cell in Papyrus http://emp.byui.edu/wellerg/Cell Types and Tissues Lab/Images/Fiber.jpg Stone cells in pears http://emp.byui.edu/wellerg/Cell Types and Tissues Lab/Images/Sclerids.jpg Structural features: dead; very thick secondary cell wall Function: a) b) c) d) e) Decoration? Support / protection? Enlarging surface area? Water preservation? Other? What do these cells do? http://www.cas.muohio.edu/~meicenrd/anatomy/Ch 7_Protective/pcep.jpg http://www.unimuenster.de/GeoPalaeontologie/Palaeo/Palbot/c ut1a.jpg Structural features: Tightly packed together; thick waterproof cuticle layer Function: a) b) c) d) e) Decoration? Support / protection? Enlarging surface area? Water preservation? Other? What do these cells do? http://upload.wikimedia.org/wikipedia/c ommons/7/75/Arabidopsis-epidermand-trichome.jpg http://www.queensu.ca/biology/new s/sneddentrichome/trichome.gif http://t1.gstatic.com/images?q=tbn:ANd9G cRrA2tze02y1uajzmDCObWYYXfhnL4Cu FIe72KwKcEINNGW47wq Structural features: sharp outgrowth Function: a) b) c) d) e) Decoration? Support / protection? Enlarging surface area? Water preservation? Other? http://www.namethatplant.net/Images/Ima gesTN/tn_mam/tn_mam_roughleafdog06 0310dz.jpg What do these cells do? http://botit.botany.wisc.edu/Resources/Botany/ Root/Grass Root Tip/root hair.jpg http://www.bio.miami.edu/d ana/pix/roothairs.jpg Structural features: more delicate outgrowth Function: a) b) c) d) e) Decoration? Support / protection? Enlarging surface area? Water preservation? Other? http://www.amjbot.org/co ntent/90/6/823/F3.large.j pg What do these cells do? http://lh5.ggpht.com/_wYv4UjyptOQ/TPMRfco0LpI/AAAA AAAAAzA/uJMDI2XWDr0/image131_thumb.png?imgmax =800 http://discoverysedge.mayo.edu/diabetesmetabolism/images/de10-4-diabetes-myofibril.jpg Structural features: numerous mitochondria & myofibrils Function: a) b) c) d) e) Decoration? Support / protection? Enlarging surface area? Water preservation? Other? Summary • What have you learned today? – Relationship between organelle content, cell structure and cellular functions • What new questions do you have now?