0
votes
0answers
6 views

Do you produce more sperm after 1 week of abstinence vs 1 year of abstinence

Question: I was wondering if the amount of sperm increase with the amount of abstinence? Side questions: Is their a max amount of sperm? What happens with the excess amount?
0
votes
0answers
6 views

Difference between medicinal caffeine and regular caffeine

There are some OTC paracetamol tablets, some with caffeine. Is this caffeine the same as the regular caffeine (found in a coffee)? Does it perform better than it in any way?
0
votes
0answers
8 views

How prominent is the gene-centric view of evolution among professional researchers?

Richard Dawkins famously advocated a gene-centric (as opposed to organism-centric) viewpoint on natural selection, most notably in The Extended Phenotype. However, I have also heard "on the grapevine" ...
0
votes
0answers
5 views

What are the sources of energy that alcohol provides?

Milk contains sugar and proteins which give energy. What compounds in alcohol give energy? Are they more likely to turn into fat (as in beer belly) than blood glucose?
1
vote
3answers
26 views

What is the difference between eugenics and evolution by natural selection?

So with the working definition of Eugenics: "the aim to improve the human gene pool". What are key features that distinguish Eugenics from evolution by natural selection? I mean, besides that natural ...
6
votes
2answers
103 views

HIV and effectiveness of inhibitor cocktail over single inhibitor

I'm looking for clarification on the answer to this question. It's in my biochemistry class but I figured this is more Biology than Chemistry, so I'm asking it here. The question is: One of the ...
1
vote
0answers
7 views

How reactive are reduced antioxidant molecules?

When antioxidant molecules stabilize free radicals, they themselves become unstable and reactive but to a lesser degree. How reactive are these reduced antioxidant molecules? And what substance ...
0
votes
0answers
6 views

Why are the largest land/air animals today smaller than in the Mesozoic?

The largest dinosaurs and pterosaurs seem to have been much larger than the largest animal terrestrial/avian species since. Was the Mesozoic somehow more hospitable to large animal species than ...
-1
votes
0answers
16 views

adaptive and innate immunity [on hold]

Adaptive immunity has evolved in vertebrates but they have also retained innate immunity.What would be the disadvantages of having only an adaptive immune system?how possession of both types of ...
1
vote
0answers
22 views

Molecular Cloning- Blunt end restriction endonucleases

I work in a microbiology lab where we do a lot of cloning. I have always used restriction endonucleases to cleave the DNA to have sticky ends and not blunt ends. I currently am working on a project ...
9
votes
1answer
603 views

Are there birds with knees instead of elbows?

This is probably not a very good question for this site, but I couldn't find an answer elsewhere. Are there any birds whose legs fold the same way human legs do, in a knee, instead of an elbow which ...
1
vote
0answers
23 views

Alkaline Phosphatase

What is the predominant purpose of Alkaline Phosphatase in skeletal muscle fibers and liver cells. I know that it is a hydrolase enzyme that speeds up the degredation of proteins, lipids, starch and ...
0
votes
1answer
32 views

Is there any research paper which identifies left and right brained behavior?

There are many web puzzle to identify, but does it really have any scientific proof? something like - http://braintest.sommer-sommer.com/en/ any logic behind it?
0
votes
1answer
20 views

Forum on synthetic biology and hypothetical biology?

I am interested in synthetic biology, but not a scientist, and would like some advice on where to look for an online forum on synthetic biology and creating fictional species and animals or if someone ...
0
votes
0answers
5 views

Does using fertiliser reduce the energy required for active transport in plants, for the ion in question

Apologies if this belongs in the chemistry stack exchange. I was just wondering if it did, as carrier proteins require energy to get a particular ion into the plant.But does it take more energy in ...
2
votes
1answer
28 views

Why do I feel funny in my tummy when riding a virtual roller coaster?

I've ridden a virtual roller coaster on an Oculus Rift. I felt tension as I went up to the top, but more interestingly I actually felt my stomach drop when I went down the steep drop on the other ...
0
votes
0answers
23 views

Absorption of foreign bodies through the alveoli [on hold]

What is the maximum size of a substance which can pass into the body through the alveoli?
0
votes
0answers
25 views

Dead skin cell decomposition

What would be the resultant by-products of a completely decomposed dead skin cell? What would be the size of each of the by-products of a decomposed dead skin cell? How long would it take for a dead ...
0
votes
2answers
30 views

How do kidney cells excrete their own wastes?

The kidney is composed of tissues, and those tissues are made up of numerous cells - so how do these cells excrete their wastes? Lastly, are there any wastes in the venous blood (renal vein), what ...
1
vote
0answers
31 views

Artificial Gene Alteration [on hold]

Is artificial alteration/"correction" of genes conceivable? I know viruses can manipulate DNA or RNA to replicate itself, but its only temporary, right? If this were possible, how would it be gone ...
3
votes
1answer
38 views

Burning fat transferred from one part of the body to another

While doing some research on cosmetic surgery, I discovered that there are several ways of doing breast enhancements, one of which was using body fat. While I haven't researched this method, I assume ...
-1
votes
0answers
16 views

Why do fungi need water? [on hold]

I have an assignment in which I have to explain why fungi need water, air, sunlight temperature and food. If plants soak up water from their roots, do fungi do the same thing? If so, what do they use ...
2
votes
1answer
33 views

Is the activity of enzymes in the human body affected by the outer temperature?

I have to do a research about the enzymes in the human body and the things that affect them. I know that the body temperature affects the activity of enzyemes but I'd like to know if the outer ...
2
votes
1answer
40 views

Is there a maximum size for an insect?

I have read in biology text-books that one of the most important constraints on the size of an insect happens to be the importance of the surface-volume ratio. It simply states that if we assume ...
1
vote
1answer
16 views

Help me understand my membrane potential assignment

Epithelial with the ability to transport NaCl is bathed in an isotonic salt solution with these values (in mM): 136 Na, 6 K, 140 Cl. The intracellular concentrations are: 45 Na, 100 K, 13 Cl. The ...
2
votes
0answers
22 views

Which organs in the body are responsible for measuring temperature?

As an instrumentation engineer, I have designed temperature control systems capable of measuring and controlling temperature with a precision of 0.001K over a wide temperature range. I have always ...
0
votes
0answers
8 views

Does dendrite have Na/K electrical channels?

Does dendrite have Na/K electrical channels if not so how can we sense the touche/pain/scald in our skin because we learned that Na/K electrical channels are present only in nerve fibers (axon).In ...
4
votes
0answers
24 views

Hill's function for translational regulation

Transcriptional regulation is generally modeled as a Hill's function (similar to Michaelis-Menten Kinetics): $$\frac{dm_X}{dt}=\alpha _{m_X}.\frac{R}{K+R} -\beta _{m_X}.m_X$$ Where $m_X$ is the mRNA ...
-1
votes
0answers
32 views

Accelerated tree growth [on hold]

Can someone explain to me the growth of a redwood tree after it is cut just above the ground, if that happens at all? Also if it does, what would it look like during an exponential growth spurt, but ...
-1
votes
0answers
15 views

Eukaryotes and Genetic Modification [on hold]

Assuming endosymbiotic hypothesis on Mitochondria evolution, is it feasible that humans could Genetically modify ourselves ... As far as it comes to a cell producing Mitochondria, are they present in ...
0
votes
0answers
30 views

Clustal X command-line version [on hold]

I downloaded a precompiled executables CLUSTAL software from http://www.clustal.org/clustal2/. When a .dmg file was downloaded, I tried clicking it but then it pops up: ...
6
votes
1answer
28 views

Can “human exclusion zones” in national parks for preserving Wolves and Grizzlies be a good idea?

There are National Preserves in the National Parks where some human activities are permitted. But can it make sense to create "exclusion zones" so no human would be permitted in a certain area, not ...
1
vote
1answer
30 views

What is the name of the critter depicted in the attached image?

I found a critter on my bathroom towel. It's really tiny. Maybe 2 milimetres? I placed it on an envelope for the photograph. Can someone identify what it is?
2
votes
1answer
14 views

Why is the vermis of the cerebellum associated with speech?

I've found multiple sources claiming that damage or impairment as a result of alcohol to the vermis of the cerebellum results in speech impairment. I find this a bit surprising, since the only areas I ...
1
vote
1answer
27 views

How can I compare the STRIDE and DSSP output files of a particular pdb file?

I have the pdb file of H-ras protein 5P21.pdb. I am supposed to compare the output of DSSP and STRIDE files after feeding this pdb file to respective servers. My question is how to make a quick ...
2
votes
1answer
92 views

What kind of fly is this?

I found this dude hanging out in my sink, but he didn't fly away when I put a dish in the sink. Turned out it was dead. The front part looks exactly like a housefly. But, I've never seen the back end ...
1
vote
0answers
19 views

What is the difference between rheobase and threshold?

What is the difference between rheobase and threshold? In the definitions I've read it's described as almost the same thing and when I asked my professor he couldn't convince me so can you give a ...
0
votes
1answer
13 views

What is the difference between the basal membrane and the basal lamina?

I'm researching about the basal lamina in lung tissue and I'm not sure if the basal membrane is the same. What is the difference between them?
1
vote
2answers
19 views

How does non-homologous end joining (NHEJ) work?

I was reading about non-homologous end joining (NHEJ) in my molecular biology of the gene textbook but the explanation provided in the text was rather vague to me, and I was not able to understand it ...
3
votes
1answer
25 views

How are chickens affected by light?

When I was young, I was told never to put a fluorescent light in a hen house because it continuously turns on and off. Extra lighting is used, as far as I know, to 'extend' a chicken's day. Human eyes ...
1
vote
1answer
34 views

Which immunosuppression caused by long-term usage of these antibiotics in untreated celiac disease?

These antibiotics include amoxicillin + acidum clavulanicum (beta-lactam, inhibit cell wall synthesis, broad specturm, 3rd gen aminopenicillin) / last part preventing the resistance ceftriaxone (3rd ...
1
vote
0answers
18 views

Like size and colour constancy, why does the brain not maintain focus constancy?

I have progressive myopia. I grew up with perfectly normal eyes but slowly started getting myopic. The thing is, my brain knows (or should know) what the world looks like -- it knows that far away ...
1
vote
0answers
18 views

A good introductory book to histology?

Like the title says, I am looking for a good introductory text to histology. It would ideally cover sample preparation microscopy staining, and several example experiments Suggestions?
18
votes
3answers
1k views

Why do we need red blood cells?

From what I know, the main function of red blood cells is hemoglobin transport. So, why do we need cells packed with hemoglobin: why can't it travel freely in the bloodstream? My own thoughts were: ...
0
votes
2answers
48 views

What are the genus and species name of different breeds of dog?

Can you refer me to a good source containing the genus and species name of different breeds of dogs?
1
vote
1answer
13 views

Lateral corticospinal tract and termination

I'm studying the motor pathways of the brain and I'm a bit confused about how the lateral corticospinal tract descends. From Neuroanatomy: Text and Atlas by ...
2
votes
1answer
35 views

What is the mechanism of reflex arcs?

When a reflex arc occurs the signal from the receptor passes straight to the motor neuron instead of being passed onto the brain. This is a rather simplistic explanation, I was hoping to make it more ...
1
vote
1answer
23 views

Are there organisms that have incorporated plastic into their lives?

Are there organisms that have incorporated (manmade) plastic into their lives in any way? Either in their diet, or as a part of their body?
1
vote
0answers
18 views

Regarding benign tumors and what 'stops' them

Benign tumors can grow to dangerous size yet are they capable of metastisizing ; if not what stops this? Also with a benign tumor if you call its cells 'near' its edges its tumor 'cell wall' I was ...
0
votes
1answer
51 views

About the plight of Elephants and efforts to conserve them? [on hold]

Poachers are only after the ivory horns right? I read this story from the New York Times ( I think) of saving a Rhinocerous by some Park Rangers and a Vet. ( forgive spelling) ; they tranquilized the ...

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