<p>@SATnotACT, why doesn’t proteins work? I thought growth in plants highly relies on proteins…</p>
<p>@santaman</p>
<p>indeed fertilizer is nitrogen mostly, which is inorganic substances</p>
<p>I got at least 80 wrong.</p>
<p>Any update on the questions for the two rRNA questions on the base difference labs? Or in fact all the questions on that lab?</p>
<p>@ujkimnada</p>
<p>Is this for molecular specific? Or is it part of the general (the G+C) lab?</p>
<p>I’m at -11 right now -_- That can’t possibly be good. Here are the ones I’ve missed/left blank just for reference.</p>
<p>Posterior pituitary gland one was hypothalamus.
PTH decreases, and Calcium increases.
Pine trees one was evaporation.
Acid deposition one was burning of fossil fuels.
Epithelial cells have tight junctions.
DNA sequence was inverted.
Genetic drift for the one that said the allele randomly disappeared (or was it mutation?)
DNA strand was open in the middle for lab question.</p>
<p>People told me Bio was supposed to be extremely easy. For people who have taken it before, how was this test in comparison to others? Not even sure if its worth it to retake.</p>
<p>As this is the first time I took bio I am also very curious and wondering whether I should cancel and retake. How was this in comparison?</p>
<p>EUREKA!</p>
<p>I think I may have found soltuion the pine tree problem.
Here are two wikipedia quotes:</p>
<p>“Similarly, in the northern hemisphere a south-facing slope (more open to sunlight and warm winds) will therefore generally be warmer and dryer due to higher levels of evapotranspiration than a north-facing slope.”</p>
<p>"Conifer forests tend to have higher rates of evapotranspiration than deciduous forests, particularly in the dormant and early spring seasons. This is primarily due to the enhanced amount of precipitation intercepted and evaporated by conifer foliage during these periods.[2] "</p>
<p>Now North American Rockies are in the Northern hemisphere. The southern side of the rockies has more evaporaiton and transpiration going on due to warmer air and sun. But conifers require much of that water to grow properly, since conifer forests take up more water than other forest types as stated in the second quote. Hence, conifer forests or pine trees are hard to grow on souther slopes due to lack of water or TOO MUCH EVAPORATION. Hence the answer I believe is the evaporation option</p>
<p>@exile. They all seem to be correct, the ones you posted. The answer is genetic drift not mutation for disappearing</p>
<p>Wouldn’t Calcium levels decrease as PTH decreases? PTH takes calcium from the bones and puts it into the blood, increasing Calcium levels. So if there was no PTH, it wouldn’t leech any calcium from the bones, so the body would have no way of increasing the blood’s calcium content.</p>
<p>the PTH lab was trickier than I thought.
I put decrease for the first one. If you remove the parathyroid gland, PTH should go down.
For the second one, I put decrease as well. The parathyroid hormone is responsible for adding calcium. If you have less parathyroid hormone, you have less calcium. The graph is misleading. The graph shows what happens when calcium (the independent variable) is manipulated in a feedback response. More calcium, the less PTH and more calcitonin. The less calcium, the more PTH and less calcitonin. But it is a correlational graph. You can’t say that reducing PTH will increase calcium. You are not manipulating PTH in the graph.</p>
<p>Most likely what would happen is if you decrease PTH, the graph will shift to the left.</p>
<p>Great explanation, SATnotACT</p>
<p>@SATACT
I agre with you on the first parathyroid quesiton.
But what was the exact question for the second parathyroid problem?</p>
<p>If you remove parathyroid gland, what happens to calcium levels?</p>
<p>More evidence from a website about the parathyroid gland:</p>
<p>" When the calcium in our blood goes too low, the parathyroid glands make more PTH.
bullet Increased PTH causes the body to put more calcium into the blood.
bullet Increased PTH causes the bones to release their calcium into the blood."</p>
<p>Maybe I have repeated myself too many times but does anybody remember the questions to the base difference lab?</p>
<p>I am kinda paranoid :)</p>
<p>I think we should reach consensus about the prophase - anaphase one. It’s specifically stated in the question that spindle formation is intercepted so it’s definitely prophase that is disrupted. I also did some research and found out that colchicine causes metaphase spread, which happened because the chromosomes could not be lined up in prometaphase, so the answer can’t be anaphase.</p>
<p>I agree it was definitely prophase. Spindle formation occurs then.</p>
<p>I put prophase too but anaphase has a following. Surprisingly I can’t find much online about it. Someone said earlier in this thread that spindles don’t form but prophase continues anyway. But I’m thinking that spindle formation is apart of the definition of prophase. It gets into a wording game.</p>
<p>Definitley prophase. So what does a 79 or 78. earn me?</p>
<p>Guess I did not make it clear enoughh. When metaphase spread happens, the cell would not go pass the prometaphase - metaphase check point and therefore meiosis would halt at metaphase. Anaphase would not happen.</p>