All Questions

3
votes
1answer
44 views

Weird gelatinous substance in highland bog

I recently went walking in the highlands in Snowdonia, Wales and we came across this: Can anyone explain what it is? My guess was some kind of fungus but I'm not positive. The ground was very water ...
1
vote
0answers
14 views

Criteria for electrophysiological threshold

As opposed to action potential thresholds (which are yes/no events), electrophysiological thresholds of compound action potentials are arbitrary. Mostly a certain noise level is picked and when the ...
4
votes
1answer
77 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?
0
votes
1answer
22 views

How do fish communicate?

Fish, as far as I know ( of course there may be exceptions) , don't have any vocal organ...but they are proven to be social...so how do they manage to communicate with each other...on land, organisms ...
3
votes
1answer
43 views

Which is better against genetic mutations? Asexual or Sexual Reproduction?

In terms of genetics, which type of reproduction is better against adverse mutations? I understand a bit of Muller's Ratchet—in which asexual organisms accumulate a number of deleterious mutations in ...
1
vote
1answer
37 views

Can one use a hemocytometer on a compound upright microscope?

I'm posting this as a follow-up on What to look for when buying a light microscope?. The answerer states that you would need to use a an inverted microscope to count cell in the hemocytometer(counting ...
2
votes
2answers
136 views

Importance of Double Helix DNA Structure

Gene expression involves transcribing only one strand of DNA molecule. So i was wondering what are some biological advantages of the double stranded DNA?
5
votes
3answers
56 views

Why don't fish groom each other?

Fish are often plagued by external parasites, which are presumably difficult for them to remove. There are well known cases where large fish come to coral reefs and allow smaller fish to pick off ...
1
vote
0answers
27 views

Endemic plant families on islands?

Endemism on islands is quite a common phenomenon, at least at the level of species or genera. Old continental fragments like Madagascar or New Caledonia may even harbour endemic families which went ...
3
votes
3answers
81 views

Why does a cockroach not die even after decapitation?

Why does a cockroach not die after its head is cut off?
2
votes
1answer
38 views

What's the meaning of this notation?

In Wang et al., the authors state on page 663 at the top that Furthermore, Bax-/- Bak-/- cells were completely resistant to paclitaxel-induced apoptosis. What's the meaning of the ...
1
vote
2answers
32 views

What are the rules for plasmid names?

What are best practices for naming newly created plasmids? For example, a common format is pABC123. What is the exact specification? Must there be 3 letters? What ...
1
vote
1answer
32 views

Searching for comprehensive textbook

I am extremely interested in science in general and in particular biology. Due to a different choice of career-path I probably will not be learning any more biology anytime soon. So I would love to ...
1
vote
0answers
27 views

Can cracking fingers cause Arthritis? [duplicate]

I have been cracking my fingers for 2-3 years and on the first year I was told that I'm going to get arthritis because of it. I've been researching this since the first year and I've never gotten an ...
3
votes
3answers
35 views

How are amino acids neutral at physiological pH?

Amino acids with non‐ionizable side chains are zwitterions when they are at physiological pH, pH 7.4. This is what my book says. But I do not understand why. The Pka for a carboxyl group is around 3 ...
1
vote
0answers
16 views

Tumour resistance: single-cell or population effect?

Drug resistance can arise through a number of mechanisms. For instance, EGFR mutation when treating with EGFR inhibitors, or compensatory activation of alternative survival pathways. But does it occur ...
0
votes
0answers
38 views

Word denoting genetic state

Is there a single word, or brief phrase, that denotes the state of the total genetic machinery (genome + transcriptome + proteome + ...) of a cell or organ or organism at a particular point in time?
0
votes
1answer
19 views

Can Omega 3 Fatty Acids prevent chest pain in periodic Atrial Fibrillation?

It is debated if omega-3 polyunsaturated fatty acids (N3PUFa) may be effective in preventing AF (atrial fibrillation), meta-analysis here. However, much less has been considered this: Do N3-PUFAs ...
3
votes
1answer
44 views

Basic question about multiplex PCR

Let's say I have a DNA sequence with the following structure: $$ 5' - N_n - S_1 - N_{1000} - S_2 - N_{1000} - S_3 - N_n - 3' $$ Here, the $N$s represent stretches of arbitrary sequence of the ...
0
votes
2answers
86 views

Can human brain memory be removed by EMP?

The human brain is the most complicated human organ so it is hard to examine it completely but based on what we know do you think (or do you know from some source) if a human memory can be removed by ...
1
vote
0answers
20 views

Parazoa as part of sewage plant

in our zoology lecture our prof was talking about parazoa, the sponges, and that they are getting more and more in the focus of the biotech research. As he described there way of getting food, as ...
2
votes
1answer
30 views

Do metastatic cells still have their parent's identity?

If a liver cancer, for example, gives metastases. Will metastatic cells still have liver identity? I mean, if we mark liver cells, will we see the cancer cells too? Thanks a lot!
1
vote
0answers
42 views

Development of contagiousness after death [closed]

Thought experiment: In an unfortunate accident in the future my heart will stop exactly at 0:00:00 due to a cause which kills me instantly but leaves my body intact (poison, electric shock, whatever). ...
0
votes
0answers
18 views

Why vivipary is not found in all mangrove plants?

An interesting characteristic feature of mangrove plants is vivipary or viviparous germination...but some notable members of the family like Heritiera sp.( there is even a mangrove forest named after ...
3
votes
1answer
57 views

Do human visual functions degenerate due to genetic factors or by external factors?

Does eyesight primarily deteriorate 'naturally' due to genetics (genomic/epigenomic factors), or due to external factors such as normal wear and tear, or disease? By normal wear and tear I include ...
3
votes
1answer
18 views

A website for identifying birds

I am not sure if this is the right place to ask this question, but I guess that ornithology enthusiasts (or ornithologists) will have the best knowledge about it. I am wondering if there is a website ...
2
votes
0answers
21 views

Converting fmri data to association matrix

I am currently working on a new tool for the analysis of (large) weighted networks. Association matrices (correlation matrices) as obtained from fMRI data[1] are perfect examples of the kind of data I ...
3
votes
0answers
18 views

Mechanisms of Gene*sex / Genotype*sex interactions

I'm looking for suggestions of the mechanistic level at which genotype/gene * sex interactions can occur. These give different phenotypes from the same geneotype dependent on the sex they are ...
1
vote
1answer
42 views

What is meant by “genes involved in the stress response”?

I would like to know about the term stress response. For example "some genes of a species under study is involved in stress response". What does that mean? I got this as a part of my assignment ...
23
votes
1answer
1k views

Ripening bananas artificially: What is the biological reason

I am a resident of the tropical island of Sri Lanka, and we have a strange traditional method to ripen our bananas quickly. What we do is this: We dig a pit in earth that is enough to put the whole ...
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 ...
0
votes
0answers
8 views

What are some resources for learning biological compound(upright) microscopy ground-up?

I have done some research for a while now and have seen that most of the websites offer either superficial information(microscope-microscope.org) or use terms that are not ...
1
vote
1answer
23 views

Is the poison from Stink Bugs dangerous?

I just went to kill what I thought was a moth on the wall, and instead it fell on the floor and it sounded like dropping a coffee bean (because of the hard shell) I live in the UK and have never seen ...
3
votes
1answer
29 views

What does it mean for the signals for transcription and translation to be “conserved”?

I was reading this article: "Overview of vector design for mammalian gene expression." for an explanation of why mammalian cell lines are used for expressing cloned genes, and one of the reasons ...
3
votes
1answer
45 views

What could live inside a pillow? [closed]

I have a phobia of bugs (or other small creatures) living inside my pillow and crawling into my ear in the night. It might seem silly, but bare with me. Recently I got wondering, what organisms ...
3
votes
3answers
206 views

Where does crop biomass come from?

Each year, large volumes of crop are harvested from fields. Where does this biomass get replenished from?
2
votes
0answers
26 views

How to evolutionary explain menstrural cycles synchronization?

Sorry, I can not indicate the source, but I read that menstrual cycles of women who live in the same house over time sync. Is it true? How does it work?
1
vote
1answer
120 views

Why is the threshold between human embryo and human fetus defined as 8 weeks after fertilization?

Why is the threshold between human embryo and human fetus defined as 8 weeks after fertilization? What's happening on the 8th week? Note: definition of embryo based on Wikipedia's current ...
5
votes
2answers
72 views

How do insects survive the winter?

I had an interesting discussion today in which the question arose how insects survive in the winter. Since they need a high enough external temperature to be active, this seems a bit difficult in the ...
1
vote
0answers
19 views

Insects or Birds covering least distance but most wing moves

I was in search in of list or detail about Insects and Birds which move their wings most but cover least distance. I know that in insects house fly moves its wings about 200/sec and covers 5mph ...
1
vote
2answers
53 views

Is there a difference between polarity and hydrophobicity?

From literature the two terms seem to be interchangeable when discussing protein domains and motifs. But biochemically, what are the specific differences between these two terms? For example what is ...
2
votes
0answers
30 views

Imperfect dosage compensation

Dosage compensation is used to make up for different copy numbers of the major sex chromosomes in males and females (One X or Z chromosome in one and two in the other). Two main mechanisms of dosage ...
1
vote
1answer
28 views

What is the common diet of food-related IBS patients? Besides most patients being lactose intolerant, what other intolerances do they face?

I am currently writing a paper on irritable bowel syndrome, and I was wondering what the common diet of a patient with food-related IBS consists of. I've already begun discussing the pathogenesis of ...
4
votes
1answer
26 views

Need for two oxygen sensors in E. coli

E. coli has two oxygen sensors: FNR (fumarate-nitrate reductase) and ArcBA (Anoxic Redox Control, two component control systems). FNR directly senses the oxygen, while the interaction of ArcB with ...
1
vote
1answer
30 views

Why is LH level much higher than FSH level at ovulation?

My teacher showed us an elaborate collection of graphs with one of them showing FSH and LH plasma levels during the menstrual cycle. LH level was almost 3 times higher than FSH level. Why? Does this ...
4
votes
1answer
30 views

Examples of genes involved in plastic responses

Adaptive plasticity involves sensing the environment and responding adaptively to it. Intuitively, I would think that this process may ask for a more or less complex genetic machinery of regulation of ...
0
votes
2answers
43 views

Can you build muscles from watching point of view videos of people weightlifting?

According to this, "new research has found that viewing other people exercise actually increases your heart rate and other physiological measures, just as if you were working out yourself". This got ...
2
votes
1answer
42 views

(Updated question) Problem with Fold-change mean compared to absolute data (in qPCR)

For the problem below I am aware of the statistics involved but just can't get my finger around the following: In biology we use qPCR to measure gene expression or basically number of mRNA copies. It ...
2
votes
1answer
69 views

A subtle test for color-blindness [closed]

Is there a test method of proving a person being color-blind, without letting the test subject know, that he/she is being tested? E.g. showing the person cards with colored dots like depicted here is ...
1
vote
2answers
33 views

Animal swimming styles

Can a frog swim on its back, or it can use only the classic frog style? Does any (not specifically marine) animal exist with many different swimming styles, just like humans?

15 30 50 per page