<p>Today, I took a AP biology 2007-2008 sample exams which is on AP central and can be accesed by only AP biology teachers. This AP bio sample exam was my school's final exam and it was so hard, so be prepared. The hard part was the multiple choices which is bull carp. if your doing the questions from the Chiffnotes or barron those question are way easier. The real AP biology exam questions are 5times longer and 5harder. The essay is not that bad, but you can be prepared by reading the chiffnotes or barrons. </p>
<p>I have one question I want to Know answer from someone this is an essay question.</p>
<p>Discuss TWO evolutionary adaptations, other than those described above, found among other desert organisms that help to conserve water. (YOU CAN'T MENTION UREA BECAUSE THE ESSAY ALREADY GAVE THIS EXAMPLE)</p>
<p>C4 and CAM plants?
Increase carbon fixation.
Stomata is shut during the day, increased efficiency of photosynthesis.</p>
<p>Most people here have already done the 07/08 exam. I did that multiple choice and it’s a normal ap exam, nothing wrong with it.</p>
<p>what is this 07/08 exam? Is it the 08 audit?</p>
<p>And as for the mc, i took the mc questions from the cb course description of ap bio. And i did quite well on that. Those questions were really easy.</p>
<p>Ya I think it’s the audit one.
I did the entire multiple choice and I got a 5.</p>
<p>Those are the obvious ones. I would think one could even venture to say that abscisic acid can prevent a seed from germinating until a sufficient amount of moisture is present. It’s probably debatable as to whether or not it would get any points, but if you forgot about CAM and C4 and had no other choice, it’s worth the risk.</p>
<p>Well…
I’m assuming “desert plants”. You can’t say waxy cuticle, etc. You know? Those aren’t specific to only desert plants. I know what you mean by abscisic acid, but is that an adaptation specific of a desert plant?</p>
<p>We did this practice exam a couple of months ago, and I thought it was pretty easy except for the last four questions on PCR. Jesus Christ.</p>
<p>Anyway, yeah, for plants, CAM photosynthesis closes the stomata during the day to prevent transpiration and opens them at night to take in CO2. Photosynthesis occurs during the day. (It should be noted that this also prevents photorespiration. Stomatal closing in itself is an adaptation when faced with water loss. Most plants can also break down starch into glucose to decrease the water potential inside the cell. Thus, they will take in as much water as possible. Many plants also have a cuticle to cover their primary vascular tissue and suberin-covered cork to cover their secondary vascular tissue. This helps reduce water loss. Catcus thorns are actually flowers. The reduced surface area helps prevent water loss.</p>
<p>I have another question?
Why would root hair use ATP to transport water. Because I though water can diffuse through roots. How is ATP used in the movement of choromosomes during anaphase?.
How is ATP used in DNA replication?.</p>
<p>You might also be able to say an amnion for the water question, although that may be stretching it. </p>
<p>gunsanbob- Root hairs use ATP to pump solutes into their cells. This creates a concentration gradient, which leads to water diffusing into the root hairs. ATP is huge for the movement of chromosomes. The mictrotubules shortening and elongating requires ATP, as does the break of the cohesin that connects the sister chromatids, among other things. ATP is used in DNA replication most likely to fuel the proteins used. I’m not sure about this one, although it makes sense. I’m saying these answers off the top of my head, so feel free to correct me.</p>
<p>I’m pretty sure that ATP provides the energy for DNA polymerase to operate. I want to say that it provides the energy for the phosphate backbone to covalently bond, but the nucleotides are manufactured with three phosphates, which then hydrolyze into pyrophosphate and the final nucleotide - an exergonic reaction to power the covalent bonding of the backbone.</p>
<p>Ya ATP brings in the DNA polymerase and binding factors</p>
<p>What if the two phosphate groups on the nucleotide are used to power DNA polymerase? That could work. But I think ATP or an equivalent would definitely be needed to power the stuff like topoisomerase and ligase I’d think. This question has never come up in any test I’ve ever taken. They don’t usually ask for what ATP does, because it does so many different things.</p>
<p>I really have no idea about this one. Neither Campbell/Reece nor CliffsAP mentions it. I know that guanosine triphosphate is used to power translation of mRNA into a polypeptide, but I don’t know for DNA replication. It’s possible that helicause uses ATP to unwind the DNA.</p>
<p>Wait… so are the cliffs exams easier then the real thing or vice versa? Because I have heard different things.</p>
<p>chiffnotes exams are way way way easier. I want out my score and I got a 80% on the practice test Ithink that’s 5 right.</p>
<p>Senior0991 thx for the answer. That is exactly wat i wrote hope it’s right</p>
<p>Can somebody PM me a copy of the Course Audit?</p>
<p>the title of this thread is misleading</p>
<p>Yeah could someone PM me a copy of the course audit. I have the audit for Physics C (both parts), B, and Chemistry.</p>