<p>Here are the 2010 ap bio frq questions:</p>
<p>Can anyone provide me wth complete answers to all four of these free responses?</p>
<p>I had no idea what to write for the F2 phenotype question but the ecological succession question was pretty self explanatory.</p>
<p>Here were my answers, any comments welcome:</p>
<p>**1. Homeostatic maintenance of optimal blood glucose levels has been intensively studied in vertebrate organisms:<a href=“A”>/B</a> 1.glucagon and insulin are two pancreatic hormones
2. glucagon heightens blood sugar levels, insulin lowers blood sugar levels
3. they work in a feedback system to maintain homeostasis
(B) 1. insulin= example target cell is glycogen cell in liver
2. signal-transduction pathway: reception is receiving of signal, transduction is transformation of the signal to a intracellular signal, and response is the response generated by the signal.
(C) 1. steroid hormones directly diffuse
2. protein hormones use signal-transduction pathways<br>
3. this difference is due to structure (I explained protein and steroid structure briefly)</p>
<p>2. An experiment was conducted to measure the reaction rate of the human salivary enzyme α-amylase. Ten mL of a concentrated starch solution and 1.0 mL of α-amylase solution were placed in a test tube. The test tube was inverted several times to mix the solution and then incubated at 25°C. The amount of product (maltose) present was measured every 10 minutes for an hour. The results are given in the table below.</p>
<p>(A) just a graph
(B) the enzymes reached saturation point or maximum velocity; I then explained that.
(C) I predicted that the enzymes would produce product twice as fast and reach saturation point twice as fast
(D) I discussed temperature and pH, and the optimal ranges of both, and how the wrong pH or temperature would potentially cease the reaction.</p>
<p>3. A new species of fly was discovered on an island in the South Pacific. Several different crosses were performed, each using 100 females and 100 males. The phenotypes of the parents and the resulting offspring were recorded.</p>
<p>(A) Cross I: bronze eyes are dominant to red eyes; follows Mendelian inheritance.
Cross II: stunted wings are dominant to normal wings; follows Mendelian inheritance.
Explained the concepts of dominance and inheritance.
(B) Cross III: the genes for bronze eyes are linked to the genes for stunted wings and the genes for red eyes are linked to normal wings; however, they were far enough apart that a noticeable rate of crossover occurred; explained concepts of linkage and crossover.
(C) I chose migration and genetic drift; the former is self-explanatory (though I explained it on the test) and the latter is genetic change due to chance (e.g. earthquakes kill half of the population). There are, I think, about 3 more possible factors you could mention though.</p>
<p>**4. The diagram above shows the succession of communities from annual plants to hardwood trees in a specific area over a period of time.
<a href=“A”>/B</a> kind of general; I said that pioneer organisms, like lichens, would grow and then more complex species would colonize the area, like bushes, climaxing to trees.
(B) I said that wind, sun, and soil nutrients were all abiotic factors that could lead to the growth of the area or succession.
(C) (i) immediate: would be leveled and soil destroyed
long-term: primary succession (explained it)
(ii) immediate: soil layer is left intact but community is destroyed
long-term: secondary succession (explained it)
Note: #4 I did not know that well. Kind of a vague question.</p>
<p>Comments or corrections welcome.</p>
<p>Do you have the answer to number 4? We’re doing it for homework and I am super confused.</p>