<p>Now that it has been 2 days, can people give me ideas as to what I would get for AP bio?</p>
<p>quesiton 1 a.
I used for my 3 macromolecules..
proteins
cholestrols
phospholipids.
Then I allowed one paragraph for each one. I said phospholipids are able to move laterally to allow water pass through. Talked about tails + heads and said they are composed of 2 fatty acid chains + one phosphate group.</p>
<p>Next for proteins. Said they were polymers of amino acids. I said they functioned in receptor, channel, recogntion, and adhesion. I gave examples of some. I then said proteins have an amino group, a carboyxl group, a C, a H, and an R group.</p>
<p>Now for cholestrols. I said they were polymers of fatty acids and form ring structures. I talked about that they helped molecules move across membrane etc.</p>
<p>Ok for b Now I pretty must owned the musle contraction. I talked about how NA + crosses membrane (depolarize), then KA +, and then refractory period (memebrane - active transport Na / k+ pump). THen I talked about how this makes sacroplasmic reticulem releases CA 2+ which cause actin + myosin to slide past each other resulting in contraction.</p>
<p>For chemiosmotic prod. of atp was easy. I said on the cristae of the membrane the ETC forms and E- carriers like Nadh and Fadh do this reaction.
H2 <--> h+ + e-. The e- combine with o2 to form h20. and the h+ ions cross the membrane to the outer compartment across atyp synthase to form atp.</p>
<p>Next for intercellular signaling, I did this. i talked about desmosomes, tight, and gap junctions and elaborated on them.</p>
<p>for question 2 now.
I talked about platyhelminthes as the first with cephalization. Cephalization arises from bilateral symmetry and I talked about advantages of that.</p>
<p>Then I talked about the hydra and the nerve net system. Then I talked about the ectoderd (during gastrulation) for the development of the vertebrate embyro. Finally I talked about the nerula stage here too (notochord + neural tube + i drew a diagram with these 2).</p>
<p>For part C i talked about
Sensory (external stimulus) --> inter (brain or spinal cord) --> motor (muscle movment or reaction). I talked a bit about depolarization and how reactions occur to excite the next neuron etc.</p>
<p>now for question 3 I talked about the wide temp. fluctuations in the desert. I said it was the biggest fluctuations during day in night than any other biome. I said high temp can denature enzymes. </p>
<p>Next I said soil comp. was very poor. I talked a bit about xylem, phloem, and tracheids, sieve tube elements and how they function in participating in moving the soil nutrients up.</p>
<p>Next annual precipitation. said it was low. Talked about some ideas of it in plants. (may have said waxy cuticle helps to keep water but its not enough. Also talked about tracheids + xylem + water potential here).</p>
<p>Next the four food organism. Just said desert strawberry --> cricket --> lizard --> snake and labeled the 4 guys (autotroph, primary etc etc.)</p>
<p>For c I said species A was a c4 plant and B was a cam plant. I said that C4 plants undergoe carbon fixation in the bundle sheath cells and c4 do not. I talked about how it worked in a c4 plant (Pep carboxylase fixes co2 to OxO to malate to pyruvate + co2 in c4 and malic instead for cam.). I talked about the evolutionary significance. Allows c4 to live in hot try climates and Cam to live in deserts. i gave an example of a c4 plant (corn).</p>
<p>Finally 4. I had no clue for A. I skipped it.</p>
<p>For B. part 1 : I talked about restriction enzymes and to cut the plasmid. Sticky ends and etc. Inserting it into bacterium.</p>
<p>part 2. I said gel electrophoresis could identify a recombinant bacteria. I then and explained how (use the normal bacteria as a marker. See which one migrates further). I did explain all the steps in gel electrophoresis.</p>
<p>for part 3 of b i said make sure the bacterium lives in optimum conditions and that the gene of interest was favorable and able to be reproduced.</p>
<p>For C. i talked about antibiotics on bacteria (they become immune) and DDT and its affect it had on the environment but one that helped us.</p>
<p>I think i did pretty well. But I am aiming for a 5. If someone has an idea of roughly what points I would get I would be in deep thanks. I know this is asking for a lot but please help me!.</p>
<p>AND SORRY for all the grammar and spelling errors. I typed this fast.</p>