<p>Ah, so the AP US History study thread is helping me out bunches. Lets start a Biology one!</p>
<p>What capillary arrangement in a fishs' gills helps mazimize the absorption of oxygen from the water?</p>
<p>it's arranged so that bloodflow goes against the direction of water so it allows countercurrent exchange and maximum oxygen/carbon dioxide diffusion.</p>
<p>what's synapsis?</p>
<p>The pairing of homologous chromosomes during prophase I of meiosis.</p>
<p>Blood flows from the heart to the lungs in the pulmonary artery and returns from the lungs to the heart in the pulmonary vein. The blood in the pulmonary artery is</p>
<p>(A) higher in O2 and lower in CO2 content than the blood in the pulmonary vein
(B) higher in both O2 and CO2 content than the blood in the pulmonary vein
(C) lower in O2 and higher in CO2 content than the blood in the pulmonary vein
(D) lower in both O2 and CO2 content than the blood in the pulmonary vein
(E) higher in O2 content, but about the same in CO2 content as the blood in the pulmonary vein</p>
<p>C</p>
<p>What is the male gametophyte of an angiosperm?</p>
<p>two haploid nuclei (the germ nucleus and tube nucleus) contained within the exine of the pollen grain </p>
<p>What is Biogeography? And what are the 3 main processes in biogeography?</p>
<p>A. Evolution, Extinction, Dispersal
B. Evolution, Miosis, Mitosis
C. Migration, Population, Evolution
D. Migration, Miosis, Replication</p>
<p>A: Biogeography attempts to document and understand the patterns of biodiversity. </p>
<p>Here's a semi-tricky one (do they have to be multiple choice?):</p>
<p>What do nerves and glands have in common?</p>
<p>Um, Nerves and glands are both made of cells.....(I don't think thats what you're looking for but hey you can't argue with that)</p>
<p>Q- Which process produces the most ATP?</p>
<p>Electron Transport Chain</p>
<p>What are the 4 characteristics of Chordates?</p>
<ol>
<li><p>Notochord, or a rod of vacuolated cells, encased by a firm sheath that lies ventral to the neural tube in vertebrate embryos and some adults.</p></li>
<li><p>Hollow nerve cord that lies dorsal to the notochord</p></li>
<li><p>Pharyngeal pouches</p></li>
<li><p>Endostyle - elongated groove in the pharynx floor of protochordates that may develop as the thyroid gland in chordates</p></li>
</ol>
<p>What are teh roles of alleles in genetics and heredity?</p>
<p>^You could like write an essay on that, but alleles are basically what's passed down from generation to generation. The combination of alleles recieved from parents determines traits.</p>
<p>Describe the 5 conditions for Hardy-Weinberg equilibrium.</p>
<ul>
<li>the members of the population mate randomly generation after generation</li>
<li>each member has an equal ability to reproduce
-gametes for each generation are drawn at random from the gene pool of the previous generation
..... what are the remaining two?</li>
</ul>
<p>NOW ONTO THE NEXT QUESTION:
identify types of mutations on the gene sequence, and describe the significance of each.</p>
<p>Insertions/Deletions: maybe result in a frameshift mutation (where totally different proteins are made since the bases are grouped in 3's so the sequence will get completely ****ed if a base or two is added or deleted).</p>
<p>Silent mutation: not much significance. It's silent.</p>
<p>Can't think of any more.</p>
<p>And to answer my own question:
1. Random mating.
2. No natural selection.
3. Large population.
4. No genetic drift.
5. No net mutations.</p>
<p>Another question:
In which stage of Meiosis does crossing over occur?</p>
<p>prophase I.</p>
<p>urm... for the mutations, there are insertions ex. frame-shift/ point mutation, deletions, point-mutations, and substitution mutations: missense and nonsense mutations</p>
<p>Question:
Describe the steps of the Nucleotide excision repair of DNA damage?</p>
<p>bump .</p>
<p>not sure about that. but to keep the thread alive, here is my question.
what is tetrad?</p>
<p>Pair of crossed homologous pairs-tetrad</p>
<p>DNA Correction:
Removal of introns(Through RNA Splicing)
Adddition of 5' Cap and Poly 3' A tail</p>
<p>What are motor units?</p>