2
votes
0answers
37 views

Rushed publications based on flawed data

In 2014 BICEP2 made a very controversial press release. It was rushed, given before any papers where published, because they feared they would be scooped by another similar experiment. In the end it ...
35
votes
3answers
4k views

How could humans have interbred with Neanderthals if we're a different species?

To be clear, I'm not doubting that homo sapiens and homo neanderthalensis did interbreed: of that much I'm convinced. Within the past few years I've seen an upcropping of pop-sci articles discussing ...
1
vote
0answers
33 views

Is lung size/shape a factor in long-continuous running of animals?

Apart from other factors, does lung shape/structure/size play any role in long-continuous running animals. Is there any similarity in lung structure between different long-continuous running species?
3
votes
0answers
72 views

How long a dog can remember its owner's smell?

Can dog remember multiple smells? and how long it can remember a smell?
3
votes
3answers
133 views

Abbreviations for molecules: What are CheW, CheA, CheY?

I've encountered the abbreviations such as "CheW" and "CheA" for certain organic molecules. For example: Proteins associating with the Tar complex include the autophosphorylating protein kinase ...
2
votes
2answers
208 views

What makes diffculty to make a human bio-tooth compare to a mouse's? [closed]

Some time ago I read a news article that said a bio-engineered tooth based on a mouse's would be available around 2015. There was some research about it at King's College in the UK, and many other ...
0
votes
2answers
49 views

Rampant low Vitamin D

Why have people inadequate vitamin D status? Is it just (the lack of) sun exposure, or is it related to hormone and thyroid function?
4
votes
1answer
677 views

Why is the neuronal plasma membrane more permeable to potassium ions than sodium ions?

From what I understand, the greater permeability of the neuronal plasma membrane to K+ ions (which diffuse out) than Na+ ions (which diffuse in) helps to maintain the -60 mV resting membrane potential....
0
votes
0answers
45 views

yeast colonies pulsing out soft fringes against the light

I have no idea about this part of the following text "pulsing out soft fringes against the light". Can anybody explain about it and provide some images, please? Does it mean that these colonies ...
2
votes
2answers
63 views

Bacteria Replication

I learned this at a lecture, but somehow I have trouble in understanding this. It is said that the bacteria such as E.coli need 20 minutes to divide, but its chromosome require 40 minutes to multiply. ...
3
votes
2answers
125 views

Do reptiles hunt?

I encountered the following passage in the book The Art of Interactive Design by Criss Crawford (bold formatting is mine): [...] From stalking and evasion to the chase, the [interaction between ...
3
votes
2answers
101 views

Why we have to damage our muscles to build them?

I know that new muscle cells are made when actin fibers are disrupted. My hypothesis is that muscle mass is limited, from birth, and that nutrients (protein) are only directed to grow muscle when ...
2
votes
1answer
28 views

ATP to disassembly of nucleotide ratio

DNA Helicase, the enzyme that is responsible for tearing apart the strands before DNA replication, requires ATP to rip apart nucleotides. I have asked this question to several professors and they ...
0
votes
1answer
38 views

Genome Sequencing [closed]

Is Genome sequencing used to determine the relationship between two species that are believed to have a common line of descent? How accurate is this method if so? Are there more accurate methods ...
2
votes
3answers
298 views

Does a microwave oven disinfect food?

Imagine I am preparing food, just about to put it into a microwave oven, and some of it falls on the floor. Assuming it got some bacteria or other organisms (viruses?) on it, will the microwave ...
1
vote
1answer
30 views

Genetics of Hybrids

I'm working on this problem, but I'm not sure I've done it correctly. My initial thought was that the answer was $D$, but I don't see anything in the above graph that indicated the Hybrid species is,...
1
vote
3answers
133 views

Is NZT-48 real?

NZT is a fictional compound in a movie called limitless, basically it's a brain booster, it gives access to more simultaneous neuron activity. are there any real cognitive enhancers out there?
6
votes
1answer
85 views

Why does ALS start in middle age?

Amyotrophic lateral sclerosis (ALS) often starts at middle age, but I didn't find any suggestion why. Something seems to trigger the symptoms in middle age. If I am not mistaken, the sporadic ALS is ...
2
votes
0answers
17 views

How does kinesthetic work and with what do we sense this?

I know that kinesthetic and proprioception are different things but, in contrast to proprioception, I don't know how kinesthetic works. A broad explaination as well as very specific(but explained ...
1
vote
2answers
44 views

Why are so many spermatozoa produced when only one of them fertilises the ovum?

During fertilisation only one sperm can fertilise the ovum. So why so many millions of sperms are produced?? Isn't this a waste of energy?
0
votes
1answer
59 views

Are progenies factually half-clones of the parents?

Given that a "clone" (if anything, in the context of human cloning) is taken to be, as far as I have understood, a specimen possessing the same genome as his "father/mother", aren't all "non-cloned" ...
1
vote
1answer
68 views

Is it possible for a person to eat so many carrots that one turns orange?

I once read that Jerry Rubin (a famous 1960s activist) ate so many carrots that he turned orange. (This was in the East Bay Express, around twenty years ago.) I assumed it could be true, though he ...
0
votes
0answers
7 views

Double stranded breaks in E. coli

What could be a possible reason why no enzymes have been found that make double stranded breaks in the RecBCD pathway?
1
vote
0answers
185 views

Why are hybrid offspring mostly sterile? [closed]

Hybrid infertility is a common trait in cross-species offspring. Most are sterile, as they do not produce viable gametes. Examples of this can include Ligers and Mules. Could modern advancement in ...
2
votes
0answers
52 views

Why is there a size limit on inserts that a plasmid can accept?

Throughout my undergraduate education I have been taught that plasmids can't carry very large inserts, but I have never been told why. Any insight would be greatly appreciated.
0
votes
1answer
56 views

Common genes and enzymes involved in pathogen entry into host

Many microbes like Salmonella, E.coli, Legionella pneumophila etc. enter host cells via cystoskeleton remodeling of the host cell. Do all microbes follow the same path or there are any other ways for ...
0
votes
0answers
29 views

Walkthrough Analyzing/Processing Genotyping Data for Association Studies

I need help outlining the data analysis process of analyzing genotyping data you get back from a Next Generation Sequencing experiment. Here are the steps I currently believe you go through, but I ...
1
vote
0answers
31 views

Walkthrough Illumina Genotyping

I would love help outlining a basic walkthrough of the wet-lab techniques for processing blood samples from patients, all the way to loading a BeadChip, to the part just before Next Generation ...
0
votes
0answers
40 views

Shortest path and influenza spread

I have been researching on the applications of the shortest path problem to biology. I thought about modelling the spread of influenza virus and wondering if there was previous research on the topic. ...
2
votes
1answer
69 views

How can E. coli affect C. elegans expression?

Plasmids can be transferred to E. coli. These transformed E. coli can be fed to C. elegans to silence its gene expression by RNAi. How can E.coli release RNAi to C. elegans? Even if we assume E. ...
0
votes
0answers
23 views

Relationship between selection coefficient and frequency of elimination

I'm asking this question because I would like to model the influence of changes that take place during tumour evolution to estimate what changes are selected against. I am in effect looking at ...
1
vote
1answer
147 views

Bradford Reagent Disposal

I am a graduate student volunteering in a professor's lab being tasked with finding out how to dispose of certain hazardous materials. I have encountered a problem with disposing of Bradford's Reagent....
0
votes
0answers
15 views

Counting of surface bacteria in real time

I'm fairly new to microbiology (okay, I'm forced to look into it for a group project). What I'm looking for is a way to quantitatively get an estimate of the number of microbes (bacteria and/or ...
2
votes
1answer
24 views

Typical neuronal firing rates across the human cerebral cortex

I would like to find a scientific article (or articles), which would summarize typical neuronal firing rates in different parts of the human cerebral cortex. Any good references on this?
1
vote
1answer
106 views

How protein denaturation affects digestion?

Which one of these is a) easier to digest, b) more nutritious (in whatever sense): 1. scrambled egg, 2. raw egg. Bascially is "denatured protein are worse than not denatured" a myth, or not?
2
votes
1answer
77 views

Genomic DNA isolation from wheat

Can I use dry seed, wheat for example, in place of young leaves for isolation and purification of genomic DNA for PCR amplification? The goal of my experiment is to validate a novel gene which is ...
1
vote
2answers
80 views

metabolism preference by the body

What I know about metabolism is that,during exercise body uses carbohydrate first then fats and then protein,so my question is why does body prefer glucose first as fuel for energy and what makes ...
0
votes
0answers
25 views

NCBI EUtils. Get Homolog infromation using Gene ID

How to retrieve homologs information in xml or json format from NCBI using gene ID? I tried one URL: ...
0
votes
0answers
45 views

Why do earthworms cross-fertilise being hermaphrodite

Although the earthworms are hermaphrodites, they dont di self fertilisation but crossfertilisation. What is the logical reason behind them doing it?
2
votes
1answer
86 views

Identification of a moth

It is from Bangladesh. Is it hawk moth? I am not sure. Please help.
0
votes
2answers
532 views

Is it possible to stop yourself from going into shock?

https://en.wikipedia.org/wiki/Shock_(circulatory) I was helping someone move a refrigerator down steps and it slipped while I was holding a sharp corner and it sliced my finger and there was ...
0
votes
0answers
64 views

How is the volume of the dialysis buffer decided?

Is there a specific ratio between the volume of enzyme solution in semipermeable membrane bag and the volume of the buffer outside the membrane bag? I have been looking for a specific formula or ...
6
votes
1answer
82 views

What kind of mushroom is this?

I picked it this evening beneath an oak, in France, Nantes : I tried an image search with Google, and it seems I picked a finger of a dead hand :) What is its name, and is it edible?
3
votes
1answer
31 views

Does the number of nodes determines the rate at which a neural signal is transmitted?

I know that the the bigger the neuron's diameter is, the faster the neuron signal is transmitted. This makes sense according to the proportionality of resistance to the inverse of area and thus, in ...
1
vote
0answers
64 views

Absorbed dose from a CT scan with relation to radiation accidents

I read somewhere that the average CTDIvol in CT scans at hospitals is ~40 mGy. This translates to the 'radiation intensity' at the center of the person, and can also be roughly interpreted as an '...
1
vote
1answer
94 views

Bootstrap question

I have a question about bootstrapping: The way that I understand it is that each number represents how well a given node is supported. So in the diagram presented, we can see that the "Seal-Bear-Cat" ...
3
votes
1answer
60 views

Purpose of antibody wash

It is common practice after surface staining cells for flow cytometry analysis to wash the antibody out of solution before analyzing a sample. I have tried analysis with and without washing the ...
20
votes
4answers
1k views

Why do we laugh?

Why is it that the reaction we get from absurdity is laughter? Everyone does it, even babies. Is there a reason why it is our instinct to laugh when we see or hear something absurd/humorous
2
votes
0answers
106 views

Why do earthworms have 4 hearts?

I was reading about earthworms and came to know that they have 4 hearts. Why is there a need for a 4 heart system? What advantages would it have over a 1 heart circulatory system except for pumping ...
0
votes
1answer
272 views

Why don't we have two hearts? [duplicate]

The human body is amazing. But there seems to be some evolutionary changes that appear to not make sense regarding redundancy. While not necessarily the primary reason for their existence, the human ...

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