2
votes
0answers
29 views

height and bryophytes

Why does being taller provide advantages for Bryophyta but being shorter is better for Marchantiophyta? What disadvantages could being taller have? I think that by being taller, you have better ...
2
votes
0answers
31 views

Textbook on molecular basis of memory

Looking at the rules in the meta, it seems book-recs are a little on the iffy side for on-topic so I hope this is okay. I am looking for a (graduate-level) textbook that has a thorough treatment of ...
1
vote
2answers
102 views

What would be the shortest and optimal method of extracting human cells for PCR? Is there a colony PCR like protocol for human cells?

I am trying to devise a quick method to extract genomic DNA from human cells for a PCR. I first collected cells by centrifuging saline mouthwash (0.9% NaCl) and extracted genomic DNA using kit ...
2
votes
2answers
34 views

Where I can download the genome sequence of various species of Fusarium?

I'm looking for genome sequence of various species of Fusarium (a kind of fungus!) on net, but I found no suitable information. Could you please help me out for this purpose? Thanks in advance
2
votes
1answer
84 views

When you blow through your nose while holding it closed to “depop” you ears, why do you sometimes feel it in your eyes?

After your ears have "popped", for example on a flight, I heard you are supposed to hold your nostrils closed and blow through your nose to readjust the pressure to the normal level. Why do you ...
5
votes
2answers
494 views

How do large herbivores get enough protein?

The food they eat seem extremely low on protein. Do they need less protein per mass unit than carnivores? Most of them grow quite a lot in the first year, is most of that from the mothers milk?
0
votes
2answers
216 views

Electroporation vs gene guns [closed]

What are the pros and cons of using electroporators (left) and gene guns (right) for transformation in terms of: Price Target organism Efficacy Ease of use Maintenance
1
vote
0answers
55 views

Can a cell completely lose the ability to undergo apoptosis?

What I mean is - can a super-cancer cell completely lose the ability to kill itself, losing all apoptosis-related mechanisms and becoming eternally resistant to any drug that tries to induce apoptosis ...
1
vote
0answers
30 views

What are the reasons which make intron detection uncertain?

Intron/exon sequence detection seems to involve statistical prediction which can at best deliver a guess (until experimentally confirmed) as to where the splice site is. What are the reasons why ...
1
vote
1answer
111 views

How does the brain manifest and realize the intention to resist sleep?

The question title says it all. What happens in my brain when I resist sleep? I would appreciate explanations on neurotransmitter changes, what areas of the brain activate to resist sleep, what can an ...
2
votes
0answers
23 views

Is lowered blood pressure a primary lethal symptom of an opiate overdose?

When someone has a opiate overdose, they can have no or almost no pulse and can have shallow breathing or stop breathing. When you stop breathing (for example) by drowning, you can survive for a long ...
2
votes
1answer
207 views

How does one calculate the amount of oxygen produced by trees?

I'm currently working on a project to measure the impact of tree planting. Calculating the amount of oxygen seems harder than I imagined. Of-course there's the type and size of the tree and the ...
2
votes
1answer
68 views

Blood pH at Higher Altitudes

My Campbell's Biology Textbook says the following: "For example, when an elk or other mammal moves up into the mountains from sea level, physiological changes that occur over several days ...
3
votes
2answers
171 views

Blebbistatin effect on vesicles

Blebbistatin is a drug that specifically inhibits the assembly of myosin in the cytoskeleton. What effect would you expect blebbistatin to have on intracellular vesicles? ...
1
vote
1answer
45 views

Can mexican salamander regenerate any organ?

Mexican salamander or few other species of salamander can regenerate limbs, tail etc. Do they have HOX genes for vital organs like liver, heart, brain, kidney? If brain is damaged, can salamander ...
2
votes
3answers
213 views

What is the difference between sequence alignment and sequence assembly?

I read the wikipedia page about sequence alignment and sequence assembly but I have not been able to find any difference between the two. What is the difference between sequence alignment and sequence ...
1
vote
0answers
38 views

Is pathlength correction vital to be included while quantifying protein

I am trying to quantify protein in serum/plasma samples. I have carried out biuret assay for my samples using microplate reader. While performing I encountered the doubt whether I should include ...
8
votes
1answer
129 views

Why does chlorination still work?

Chlorination has been used for over a century to disinfect water supplies. Why haven't microorganisms evolved immunity to this chlorine by now?
1
vote
0answers
23 views

Do scouting bees get to pass their genes to offspring?

Let's say the food-scouting behavior of scouting bees are enhanced when some particular alleles are expressed. By natural selection, the allele frequency for that "good" allele should increase because ...
1
vote
2answers
274 views

Polysaccharide vs Macromolecule

I'm having trouble understanding the difference between Polysaccharide and Macromolecule. I know that polysaccharides are made of chains of monosaccharides. In addition, I know that ...
2
votes
1answer
367 views

How to measure growth of algae with colorimeter

I am doing an lab for IB Bio and don't know how to use a colorimeter to measure growth in algae. The experiment I am doing will measure the effect of pH on algae growth. The algae will be taken from a ...
1
vote
1answer
135 views

If all bacteria in human gut are dead, can they be there again?

If someone likes to eat chocolate, she may have gut bacteria which like chocolate according to some articles that I have read. http://www.theatlantic.com/health/archive/2014/08/your-gut-bacteria-want-...
2
votes
1answer
45 views

The antiquity of man [closed]

What are the oldest fossils of modern man? What is the evidence until now? I do not ask to know the evolutionary chain that led to H. sapiens, but I wouldn't mind to hear it, nevertheless. What are ...
2
votes
0answers
18 views

How to use the law of diffusion in the presence of electric forces?

Isn't the movement of ions affected by the electric field as well? For instance, when a sodium channel in a cell's membrane opens, the sodium ions are said to diffuse into the cell, from higher ...
3
votes
1answer
70 views

How does the flow of ions along voltage-gated channels lead to nerve conduction along axons?

Let's say the axon lies along the x axis, and voltage-gated sodium channels lie parallel to the y axis. When a channel is opened, sodium ions will flow along the y direction into the cellular fluid. ...
1
vote
0answers
151 views

Trouble understanding how uncouplers in the thylakoid membrane increase the rates of the Electron transport chain?

I am a undergrad in a cell physiology class and just did a learning exercise involving testing rates of the electron transport chain via the reduction of DCPIP, analyzed by spectrophotometry. ( I ...
0
votes
0answers
31 views

GC-Content bias and length bias in TCGA RNA-seq level 3.0

I want to use RNA-Seq (level 3.0) data from TCGA database in my research. What kind of preprocessing steps I should do? Do I need to correct GC-Content bias and length bias in these data?
2
votes
1answer
48 views

How does the “heat vision” of some snakes work?

Some snakes have an infrared sense which is used to track warmblooded animals. How does that organ work? And would a similar organ be possible in a warmblooded animal?
1
vote
0answers
187 views

Can dermatophytes (toenail fungus) survive without oxygen?

I read that fungi in general can switch to alcohol fermentation in the absence of oxygen (https://en.wikipedia.org/wiki/Anaerobic_organism). How about dermatophytes ? (https://en.wikipedia.org/wiki/...
1
vote
1answer
78 views

Movement of sperm to the egg

Sperm swims through semen and reaches the haploid egg in the oviduct during fertilisation. Once the sperm reaches the cervix, through what does the sperm swim through to reach the egg? Is the ...
0
votes
0answers
21 views

How is this pseudopupil formed?

Pseudopupil is very common optical phenomenon generally arises due to compound eye structure and source of light. I can imagine normal dark spot on eyes on insect like this or this. But I was ...
1
vote
1answer
83 views

How can a blood test give information about rickets?

Can we detect rickets from a blood test? What evidence pf rickets is in the blood and how is the blood treated to detect rickets?
2
votes
0answers
61 views

Saturation vapor pressure effect on human body [closed]

I found this calculator: http://www.decatur.de/javascript/dew/ It calculates the dew point based on temperature and humidity. In the result it is mentioned the saturation vapor pressure. I barely ...
1
vote
1answer
27 views

How do macromolecules (large drugs) in the eye reach the bloodstream and what are the relative significances of these pathways?

I am considering the elimination pathways for antibodies (50-150 kDa) from the vitreous humour to the blood stream. My overarching question is what is the most significant route such antibodies could ...
1
vote
1answer
130 views

Disadvantage of using Drosophila for breeding experiment

What should be the disadvantage of using Drosophila for experiments? a)small size of larva. b)short life cycle. c)mating soon after emergence of flies. d)large number of offsprings. Options (b) and ...
3
votes
1answer
166 views

How do lipid-soluble substances diffuse through the cell membrane?

It’s said that water-soluble substances can diffuse through cell membrane with less ease than lipid-soluble substances because the former encounters impedance in the hydrophobic region of the ...
0
votes
0answers
20 views

Does inorganic particles have pattern recognition receptor?

Does silica or carbon particles (inorganic substances causing silicosis and anthracosis) have Pattern Recognition Receptor (PRR) on macrophages/dendritic cells? Because phagocytic activity depends on ...
3
votes
1answer
50 views

Why would growth hormone (somatotropin) cause both lipid AND glucose release?

GH increases lipolysis (lipid breakdown) and the release of fatty acids from adipocytes into the blood. Fatty acids then can be used as energy sources to drive chemical reactions, including ...
0
votes
2answers
66 views

When did the most recent common ancestor of all living domestic dogs live?

Wikipedia provides a very detailed page on the origins of the domestic dog, but this fact does not seem to be present there. Google searches for terms such as "most recent common ancestor (MRCA) of ...
1
vote
1answer
44 views

What is the leaf venation of a scuppernong vine leaf?

I googled around and I didn't find anything that says its leaf veination. Anyone know?
4
votes
0answers
39 views

Is the fingerprint regenerated?

Let's say you get a a cut on your finger. Will the fingerprint be regenerated to matched your original fingerprint and if so, how?
2
votes
0answers
40 views

Gene sequence and DNA [closed]

can anyone help me with this? It shows two gene sequences for a sheep and a goat. ...
0
votes
1answer
62 views

Nernst equation?

I keep seeing the Nernst equation in two different forms, one using the natural log and the other using log base 10. Could someone explain why there are two different versions, and which should be ...
0
votes
1answer
214 views

How does the modern synthesis theory explain the evolution of birds from dinosaurs? [closed]

The theory of evolution claims that birds evolved from dinosaurs only by mutation, genetic drift, migration and natural selection. However, it seems to me that wings were not selectively advantageous ...
2
votes
0answers
79 views

Is there a plant particularly suitable for absorbing Hydrogen Sulfide

I live in an area with some open sewers and in the morning I can usually can smell the gas inside my house. There are many plants like snake plant which improve indoor air quality but I was ...
3
votes
0answers
4k views

Experiment to show that carbon dioxide is needed for photosynthesis

In my school test, the question is as follows: Will the experiment work satisfactorily? What alterations can you make to obtain expected result? What I wrote: Yes, it will work satisfactorily. ...
4
votes
1answer
165 views

What is the difference between conditional and inducible activation?

In the modern genetically modified animal models, there are not only constitutive mutations which start producing proteins already in the embryo, but also mutations which can be turned on later. I've ...
3
votes
1answer
103 views

Loss of appetite during fever

It is a well-known phenomenon that sickness like the common flu is often accompanied by reduced appetite. Why do sick people stop eating?
0
votes
0answers
16 views

How much is the normal range of thiol/protein (mol/mol) concentration?

HSA(Human Serum Albumin) has just one free thiol group on Cys34. Using DTNB assay I obtained 0.4 thiol/protein (mol/mol) for this protein. I wonder if this value is a reliable number or not? does ...
1
vote
0answers
7 views

Difference on biological classification [duplicate]

Why we use term phylum for kingdom animali and use them division for kingdom planti ,prokaryota and fungi? Both are same taxanomical rank What difference between phylum and division ??

15 30 50 per page