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bio website stackexchange.com
location New York, United States
age 29
visits member for 2 years, 3 months
seen 4 hours ago

Student


Aug
1
comment How do I read a sequence logo?
DNA/RNA only has 4 nucleotides, and information content is often represented in log2 form. So a fully conserved site of, say, 10 sequences contains log(10/10/.25) = log(4) = 2 bits of information. The .25 is the probability of a given nucleotide, and the overall probability is represented by the height of the letter.
Jul
21
awarded  Yearling
Feb
11
comment Why does the arch of aorta coils?
@Masi - I'm still confused by "coils." The aorta, as you said, is an elastic artery, and has many layers of smooth muscle and elastic fibers in the tunica media. Don't you mean: "if elasticity is low, then the aorta is stiff"? It requires high elasticity to help maintain a higher diastolic pressure.
Jul
21
awarded  Yearling
Nov
7
comment What difference does it make in the organism's physiology/metabolism whether oxygen binds reversibly or not?
Ignoring the fact that hemocyanin is only in hemolymph and not red blood cells (as in humans), my guess would be no. Hemoglobin exhibits cooperativity, so that the binding of one oxygen molecule increases the affinity for other oxygen molecules. This leads to the sigmoidal oxygen saturation curve, allowing for more efficient dissociation of oxygen at target locations.
Nov
7
comment Preferred Aspect Ratio for Human Eyes
@AlanBoyd I think you're right. For some reason, I was probably thinking about ptosis, when a drooping eyelid does limit your visual field.
Nov
5
answered What difference does it make in the organism's physiology/metabolism whether oxygen binds reversibly or not?
Nov
5
comment Preferred Aspect Ratio for Human Eyes
I have to agree with Kal, but mainly about #1. Essentially, the eyes are next to each other, and this allows for stereoscopic vision. If you cover one eye, your field of view is more or less circular (due to the retina and macula), but you'll lose depth perception. Plus, your eyelids slightly limit the amount you can see in the up-down directions.
Oct
6
answered Is it possible to still grow taller after grow plates have been closed?
Oct
3
comment Multi-nucleated cells: advantages and examples?
Technically, all the granulocytes (neutrophils, eosinophils, and basophils) have multiple lobes/segments, not multiple nuclei. Syncytia in cardiac muscle cells is important for coordinated contraction. Not sure about the rest..
Sep
25
comment What is the difference between an antibiotic and an antibacterial?
Just to add to your answer: bacteriostatic agents slow down the growth of bacteria, whereas bactericidal agents kill it.
Sep
21
awarded  Enlightened
Sep
9
awarded  Enthusiast
Sep
6
awarded  Nice Answer
Aug
29
comment What phenotypes can arise from gender-related aneuploidy?
@Luke Tried to answer some of your questions in the edits. I'm not sure about the cognitive problems though :( I hope someone else can add to it.
Aug
29
revised What phenotypes can arise from gender-related aneuploidy?
added 1657 characters in body
Aug
29
comment What phenotypes can arise from gender-related aneuploidy?
I added a little more detail. I'm not sure how 47, XXX individuals are taller, but I can see that the extra Y in 47, XYY individuals make them more masculine. Just a guess though. I'll see if I can find more info about how these disorders cause their cognitive and developmental effects.
Aug
29
revised What phenotypes can arise from gender-related aneuploidy?
added 505 characters in body
Aug
29
revised What phenotypes can arise from gender-related aneuploidy?
Edited triple X syndrome characteristics
Aug
29
answered What phenotypes can arise from gender-related aneuploidy?