<p>@Josmur It’s definitely lysosome because this is what it says on Wikipedia about Tay-Sachs.</p>
<p>“is a vital hydrolytic enzyme, found in the lysosomes, that breaks down lipids. When Hexosaminidase A is no longer functioning properly, the lipids accumulate in the brain and interfere with normal biological processes.”</p>
<p>also its not a problem with translation or ribosomes because:</p>
<p>“Most Tay-Sachs mutations appear not to affect functional elements of the protein. Instead, they cause incorrect folding or assembly of the enzyme”</p>
<p>Also, please critique my post on PTH about 2 posts back.</p>
<p>What were the other choices? I seem to recall that they were like “ribosome, chloroplast, mitochondrion, microfilament”, and quite obviously it’s a genetic mutation for the enzyme, not a ribosomal mutation.</p>
<p>Nostalgic - a phototaxis is a response in motility to light. The correct answer was photoperiod.</p>
<p>Josmur - it makes the most sense, and I see the enzymes of the lysosome as part of the lysosome. If there were an error with an ETC of a mitochondrion, you would say that the mitochondrion was malfunctioning, right?</p>
<p>Just to chime in, I too put ribosomes because I thought it was testing your knowledge on the location of translation for the enzyme/protein. Then again, I had no prior knowledge of Tay-Sachs so I would have had no clue to put lysosome. If it is lysosome, it’s pretty stupid that they would test about the effects of an individual disease.</p>
<p>ThePerson1 - I seem to recall that the text described what Tay-Sachs was. It mentioned an accumulation of lipids. Obviously this accumulation wouldn’t happen if lysosomes were functional…well, I thought it was obvious. xD</p>
<p>Desperatechaos - I put that he was the first to quantitatively study genetics. It contributed more to genetics than him working with sexual reproduction. Remember, he contributed an entire branch of basic genetics that can be modeled with a simple series of squares. (:</p>
<p>I just dug out my Campbell/Reece textbook. The first section heading is “Mendel’s Experimental, Quantitative Approach”, and the entire section discusses how Mendel’s approach was unique because of this quantitative analysis.</p>
<p>About the human food problem: The question said "where did the majority of the HUMAN food supply come from. The answer then would clearly be grasslands, not any sort of forest. (As our agriculture is not stationed in the world’s rain forests. If the question had been about avg biomass or all creatures, I would think the rain forest would be the correct answer…Seeing as it mentioned humans specifically, I don’t see how it can be anything other than grasslands.</p>
<p>Based on pure punet square calcs, the huntingtons one had to be 75%. Equal 1/2 chances of him being HH and Hh. I doubt CBoard would expect you to know Homozygous Huntington babies die before maturity.</p>
<p>It was referring to the 5’ and 3’ ends. Obviously it could be narrowed down to the two that showed A with T and G with C. Then, there was one with both 5’ ends together and one with the 5’ and 3’ ends together. The latter is correct, it’s known as anti-parallelism and is one of DNA’s characteristics.</p>
<p>Well, DNA is oriented in an antiparallel direction. One strand goes 5’ to 3’ (the number indicates a carbon on the five-carbon deoxyribose), while the other goes 3’ to 5’. This eliminated three choices (three of them had both strands facing in the 5’ to 3’ direction). One of the choices had uracil, safely eliminating that one and leaving one, which just so happened to have accurate base-pairs.</p>