2009 AP BIOLOGY Discussion

<p>48 Hours are up, discuss!</p>

<p>What was that one about the reaction of X=Y (goes both ways)? Was it activation energy = zero, or the rate at which X was formed = the rate at which Y was formed?</p>

<p>For the essay question about how a virus goes against the dogma, could you use the temperate virus that undergoes a lysogenic cycle or lytic cycle (can't remember the name) where it lies dormant in a cell's DNA and keeps getting produced, or were they looking for reverse transcriptase?</p>

<p>What’s a temperate virus?</p>

<p>i used a retrovirus</p>

<p>apparently the X Y was same rate of reaction thats what my chem friends told me…
I put same concentration.</p>

<p>i hope for the viruses one retrovirus or lytic cycle would be acceptable. i put viruses that need a host cell to reproduce because viruses cannot go directly from DNA to protein, so that goes against the central dogma.</p>

<p>what’s the advantage to using other ways to determine phylogeny? (i.e. homology or embryonic development?)</p>

<p>I dunno I put retrovirus. That was the most obvious.</p>

<p>I put skeletal structures and embryonic development. Homologous/analogous skeletal structures can show specific functions and how animals are related. Embryonic development can show details that are present early on but lost in later life such as protostome/deuterostome. Sorta bs’d it.</p>

<p>What frq are you talking about with the X Y reaction stuff? Why don’t I remember that? </p>

<p>Also, for the phylogeny one, I said you can look at their genomes and compare the similarities. Like how the chimpanzee is 98% the same as humans. I said an advantage would be that its very precise. But I felt like I totally bs’d that.</p>

<p>Ahh, shoot. I forgot the central dogma… urghh I put something about DNA not being the genetic material… <_<</p>

<p>For phylogeny: I put something about base pair sequences and then morphological structures.</p>

<p>i drew a freakin cladogram! ahhhhh ***ff. i feel so dumb.
and i forgot the sugar in the ATP molecule.
uhhh … ■■■.</p>

<p>W.T.F. is censored? ***. lol/</p>

<p>Augh. When it said specific i thought it meant to actually give a specific virus so i chose HIV AIDS. i did talk about how it was a retrovirus though. And i included a diagram of an virus. Do you think i’ll get extra points for that?</p>

<p>jzhang I used homologous vs analogous too. </p>

<p>How do you draw a phylogeny tree?</p>

<p>I drew a cladogram too! High five!
Or negative five, for doing it wrong, I guess.</p>

<p>For the phylogeny one I talked about DNA sequencing (98% the same coding sequences, etc) and about morphology in terms of homologous/vestigial structures. Kinda BS’d it too.</p>

<p>I used HIV/AIDS as an example for the last part of that question. I couldn’t remember the term retrovirus.</p>

<p>For the third, I said you can use embryonic development and homologous structures.</p>

<p>I put fossils as one of them, lol. That could work, right?</p>

<p>I put fossils too. I also did comparative embryology or something. I had no idea how to draw the phylogenic tree. Oh I and I also had an epic fail on the graph. I made a bar graph, lolz.</p>

<p>^i made a bar graph too. How else were we supposed to do that?</p>

<p>I think it was supposed to be like a curve type thing (cyclic shaped). I literally stared at the data for five minutes wondering how to proceed. The lack of grid threw me off.</p>

<p>It was a bar graph. Line graph would’ve made no sense.</p>

<p>What were the possible answers for the phylogeny “other” one.
I put phenotypes and genotypes lol.</p>

<p>I put embryonic and fossil comparisons</p>

<p>Not a line graph per se, but like a bell curve.
<a href=“OpenStax”>OpenStax;
^Something like that.</p>

<p>example of phylogenetic tree </p>

<p><a href=“http://www.utm.edu/departments/cens/biology/rirwin/391/391VertPhylog.GIF[/url]”>http://www.utm.edu/departments/cens/biology/rirwin/391/391VertPhylog.GIF&lt;/a&gt;&lt;/p&gt;