8
votes
4answers
1k views

Do human cells contain only one copy of the genome?

Does each cell contain only a single copy of its genome? Or are there ever 'extra' copies present. Reason behind question: Wondering whether gene mutations could be corrected by referencing a ...
4
votes
7answers
1k views

Can we harvest energy from plants?

This is a cross-cutting question but I think its core is about biology. Our society's need for energy is dramatically growing and we are messing up with our environment to answer them. Maybe another ...
2
votes
1answer
24 views

Which virus capsids consist of only one type of capsid protein?

The Tobacco Mosaic Virus (TMV) capsid consists of many copies of one protein (http://www.rcsb.org/pdb/101/motm.do?momID=109). Which other viral capsids consist of only one kind of coat protein? Does ...
2
votes
3answers
50 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?
6
votes
3answers
89 views

Are there any known mutual symbiotic relationships that has more than two agents?

We are all familiar with the examples of symbiotic relationships in nature consisting of two agents, like lichen or the co-evolvement between certain birds and flowering plants. Do we know of any ...
1
vote
0answers
26 views

What triggers the formation of biofilm? [closed]

How does a bacterial biofilm form? In general, not specific to a certain industry or type of surface. I know how it forms; I understand reversible attachment, irreversible attachment, growth, ...
4
votes
1answer
496 views

What are the advantages and disadvantages of being ambidextrous?

What are the advantages and disadvantages of being ambidextrous? We have two hands and we nearly can't use one and this seems like a weakness, and a stupid one when you first think about it. But ...
0
votes
1answer
44 views

Calculating number of amino acids in mRNA

Assuming there were 20 different amino acids and less than 40 types of different tRNAs found in this alien organism. How many amino acids would be found in the translational product of a ...
1
vote
2answers
18 views

During bridge amplification of DNA sequences, why aren't sequences amplified in both orientations?

During bridge amplification, when sequences attached to adapters on the surface form "bridges" and are replicated, it seems like sequences with either end attached to the surface will be created. For ...
3
votes
1answer
33 views

Why did many odd-toed ungulates become extinct?

There were a lot of odd-toed ungulate animals in the ancient times but now just few of them survived. What is the reason for that?
1
vote
2answers
28 views

What are some places biofilms could develop?

I'm trying to think of places a biofilm could develop other than on medical equipment or food processing equipment such as stainless steel mechanized blades or knives. I'm thinking more along the ...
1
vote
1answer
22 views

The suspended cat clavicle

I know the clavicle of the cat floats freely as opposed to be attached as in humans. This is supposed to allow them to be able to squeeze through spaces, according to a quick google search. But how ...
1
vote
1answer
62 views

Any relevant knowledge/studies about voluntary goose bumps

I'm not entirely sure how normal this is, but since I was a child, I've been able to produce myself voluntarily a "chill" sensation that seems to start on my head and traverse the rest of my body, ...
0
votes
2answers
43 views

Are Purkinje Action Potentials Neuronal and Cardiac?

I first thought that action potentials of His-bundle i.e. Purkinje fibers are Cardiac. However, I started to think that this is not enough. I think now that they are neuronal and cardiac. My ...
6
votes
6answers
3k views

What is the use of eye banks, if eyeball transplants do not exist at present?

Corneas are donated and transplanted, but not the eyeball. I don't understand. What is the purpose of donating a cornea without an eyeball to a blind person?
1
vote
0answers
44 views

How did birds survive the KT impact?

As I understand it, the ejecta resulting from the K-T impact (also known as the end-Cretaceous or Cretaceous-Tertiary extinction event) re-entered the atmosphere all over the world; the heat from ...
1
vote
0answers
18 views

How to define the four haematological subgroup? [closed]

There are four main haematological subgroups, cross-reactive material-positive (crm+), cross-reactive material-negative (crm-), crm-reduced (crmR) and inhibitor patients. But what kind of substance ...
1
vote
1answer
20 views

Does the Peptide bond produce water in our organism?

According to Wikipedia http://en.wikipedia.org/wiki/Peptide_bond , when a peptide bond is made a water molecule is released as a secondary product. So, my question is simple (perhaps silly). ...
3
votes
2answers
320 views

Is pork poisonous?

Besides religious prohibition, there are several non-religious arguments against eating pork. A few of which are: Pigs and swine are so poisonous that you can hardly kill them with strychnine or ...
5
votes
2answers
37 views

How to identify genes required for biofilm formation

This is just a homework question: Q: Let’s assume that there is an unknown set of E. coli genes that are required for biofilm formation. Describe a genetic experiment you could perform to try to ...
-1
votes
0answers
23 views

Types of protectants for NSAIDs? [closed]

Coating drugs or protectants. I think possible types intestinal protectants such as Laxative and Cathartic skin protectants (those supporting the elasticity of the skin) What other types of ...
3
votes
1answer
31 views

Effect of recombination on the rate of loss of genetic variation

Following up from this question: Does recombination increase the additive genetic variance for fitness? (I'm thinking about the evolution of additive genetic variance and differences between the sex ...
7
votes
2answers
1k views

Can human organs be transplanted indefinitely?

I watched this movie, where they rented hearts to people for a year. I wonder if it is possible to transplant a heart indefinitely from person to person, or does the heart have a lifetime? So, do ...
3
votes
1answer
74 views

Identify the pink mold infecting refrigerated lemons [closed]

I made lemon juice 6 month ago. I just washed the lemon using brush and then cut them into pieces. Then I put one layer of lemon in the bottle followed by one layer of sugar Again one layer of lemon ...
7
votes
2answers
335 views

Can we determine a person's age by dating methods or other means?

There are many sports restricted to players of a certain age (e.g. 16 and under, 18 and under, etc.) What if a person is older and fakes his birth certificate to say that he is younger? Is there any ...
0
votes
0answers
34 views

Why do carnivorous animals have odd numbered fingers while herbivorous animals have even numbered fingers? [closed]

What principle they based on? And is different finger' numbers have different function ?
0
votes
1answer
14 views

Human longevity interventions ranked by effectiveness [closed]

Generally living longer and with a better quality of life is considered a good thing, if not for ourselves then for our family and friends who care about us. Some factors that influence human ...
0
votes
0answers
17 views

What does it mean for RNA polymerase to “escape” the promoter? [closed]

what the answer for What does it mean for RNA polymerase to “escape” the promoter?
1
vote
0answers
8 views

small RNA bioanalyzer traces showing miRNA enrichment for sRNA-seq

I am bioinformatician trying to support some small RNA-seq experiments. All bioanalyzer traces that I have seen for RNA at the small RNA range show at peak at 22. But probably it depends on the ...
4
votes
1answer
79 views

Will genetically modified food affect our health?

It's a popular public sentiment that - GM foods like tomatoes (flavr savr) will affect our health.. Is there any logical scientific explanation behind this?
1
vote
1answer
31 views

Why are there no marine birds?

Walking by the lake and watching the ducks the other day a thought struck me; there are lots of aquatic birds but all remain at least somewhat terrestrial, nesting on land. Why is it that no birds ...
1
vote
0answers
7 views

Predictive Single Nucleotide Polymorphisms (SNPs) for Bipolar Disorder

Are there any validated SNPs that are either predictive of developing bipolar spectrum disorder or are associated with its pathophysiology?
3
votes
1answer
50 views

How does rate of evolution/innovation scale with population size?

I understand that there will be many other factors that affect rate of evolution/innovation. However, other things being equal, how will the rate of evolution vary between two populations of different ...
2
votes
0answers
49 views

What proportion of salt in water would make it not dehydrate nor hydrate someone?

Drinking sea water can be deadly as it contains too much salt, basically de-hydrating the body. Normal tap water contains little salt and is good for re-hydration. My question: How much salt needs to ...
2
votes
0answers
25 views

What is the biological basis of “energy” that extraverted humans draw from social engagements and introverts expend?

This question is related to this question about introverts becoming exhausted after extended social events on cognitive sciences stack exchange. As I read more on the topic of human ...
3
votes
1answer
21 views

At which temperature is the Tick-Borne Encephalitis Virus destroyed?

At which temperature is the Tick-Borne Encephalitis Virus destroyed? If there is no data specifically for TBEV, is there any data for typical temperatures at which other Flaviviruses / Flaviviridae / ...
1
vote
2answers
45 views

Are fatty acids and glycerol lipids?

As far as I know, lipids are defined as biomolecules which are hydrophobic. Triglycerides are composed of fatty acids and glycerol and are considered lipids but, are fatty acids alone or glycerol ...
2
votes
1answer
44 views

what the best E-value cutoff in the miRNA homology search

I'm trying to use miRBase database to annotate some microRNA sequences in length 22-24bp. I highly appreciate if someone let me know whether I should do this BLAST against mature miRNA or stem-loop ...
3
votes
2answers
329 views

Do all Gram negative bacteria cause septic shock?

Do all Gram negative bacteria cause septic shock? If they don't could they if you attacked them with an antibiotic that could lyse the cell? For example any antibiotic that attacks the cell wall, ...
1
vote
1answer
18 views

Can we directly stimulate M cones in retina with current technology?

I wonder if we could try to see imaginary "supergreen" color by directly stimulating M cones. For this I suppose we'd need: Non-destructively scan specific human's retina to locate exact positions ...
0
votes
1answer
40 views

How to determine externally that a whale is a mammal?

Mammals have external qualifying characteristics like body hair, ear pinna, etc. But a whale has none of that. So, can it be identified as a mammal just by external observations?
1
vote
1answer
96 views

What are the disadvantages of forbidding flights to and from the African Ebola region?

After looking through the available Stack Exchange sites, this one seems to come closest to the appropriate place to ask... Popular opinion, including my own, is that banning flights to and from the ...
-2
votes
0answers
42 views

Extant Bipedal Primates

How many extant bipedal primates are known? I got one answer, I believe, after searching Google with the following search string: ...
-3
votes
1answer
43 views

Nature of plasmids [closed]

What are the plasmids composed of?? Genomic DNA or non-genomic DNA ? I think, the answer should be "genomic DNA"...but am not too sure...
3
votes
2answers
236 views

which exact mechanism triggers the first cell differentiation after n divisions?

I would like to understand which mechanism triggers the first cell differentiation after n divisions. I read previous articles on SE and Wikipedia articles on cellular differentiation and ...
19
votes
3answers
22k views

Why do mammalian red blood cells lack a nucleus?

How did the red blood cell in humans get to lose its nucleus (and other organelles)? Does the bone marrow just not put the nucleus in, or is it stripped out at some stage in the construction of the ...
2
votes
0answers
27 views

Rosemary room temperature at winter

I consistently read in non-scientific resources that I have to put my rosemary to low temperature (about 10°C) in winter (unless I don't want it to freeze). I googled, but I fail to find a scientific ...
4
votes
2answers
2k views

Why was the Davson-Danielli model rejected?

According to my textbook, Davson-Danielli's model of a phospholipid bilayer sandwiched between two layers of globular protein was incorrect. The nonpolar protein portions would separate the polar ...
3
votes
1answer
118 views

Do wolves bury food like dogs?

Many breeds of domestic dogs seem to like burying food, presumably in preparation for leaner times. Assuming that dogs evolved from animals similar to the modern wolves through a mix of natural and ...
4
votes
2answers
45 views

Is there a command line molecular cloning tool?

There are many softwares such as SnapGene, Geneious, Vector NTI, ApE, Gentle and others for assistance with cloning. Their key functions are: Making maps of plasmids Annotating plasmids with common ...

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