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5 views

Where is catalase produced?

I am doing a research project on the peroxisomes, and in it I referenced the enzyme catalase, which breaks down hydrogen peroxide into water and oxygen. However, the assignment asks me to specify the ...
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10 views

A question over substrate specificity. I need a short essay answer

How might substrate specificity play a role in the cell-cell identification process that features glycoproteins and receptors? WhA
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0answers
14 views

Lions protecting girl in Ethopia — how plausible is it that they understood situation?

Several years ago we read of a girl who was apparently threatened by humans being protected by lions who chases off the males and stayed with the girl. Explanations like, "her crying resembled that of ...
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0answers
16 views

Why duck vagina and duck phallus evolved this way?

I recently learned that, in ducks, penis and vagina have coevolved: the vagina of the female ducks gets dead end sacs and clockwise coils; the penis of male ducks become longest and its morphology ...
2
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1answer
19 views

Why is there a mass limit on biological powered flight?

So, this is one thing I never fully understood. There are a lot of reasons for a flying creature to be limited in mass, from energy consumption to material strength. However there seems to be a reason ...
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0answers
17 views

Doubt with Sodium and Pottasium pump

The resting membrane potential is maintained by, ·Selective permeability of the plasma membrane to K+ and Na+ ions- There are potassium channels and sodium channels, which are membrane bound ...
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0answers
13 views

Why the origin of life is single celled and not convergent?

Often times i see claims that the leading theory in the study of evolution is that all life has originated from a single cell. My Question is, isn't it just as likely that on two separate occasions a ...
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13 views

Relevance of old atomic theory in understanding biology?

I have seen the explanation of many biological reactions using the high school atomic theory (I don't remember the name but it involves using lewis dot structure). So is it the case that the effect of ...
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1answer
20 views

Why does X inactivation happen?

Is X inactivation really important? Why don’t the dominant genes on one chromosome mask the recessive on the other chromosome? This happens in other sets of chromosomes so why exactly does this happen ...
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9 views

Nutrition and experimental biology

We know that food in the stomach is present in the form of chyme treated with pepsin and hydrochloric acid, if we take food crush it with saliva and then treat it with Pepsin and HCl (in the lab),and ...
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0answers
6 views

Is atrial natriuretic peptide relased when we drink water?

I know that osmolarity is controlled by the hypothalamus and recover by ADH which reabsorb water. It also can be released when ECV is very low. ECV/salt is controlled by aldosterone/atrial ...
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7 views

How do I prepare a Basal medium for autotrophic mutant creation

Minimal medium (MM) was prepared by adding 2.0 g sodium nitrate (NaNO3) to 1 L of basal medium (BM) fol- lowing Correll et al. (1987). Chlorate resistant sectors (CRSs) were generated on two media i.e....
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2answers
16 views

What's the difference between the terms “gene map” and “genome”?

It seems some sites arbitrarily restrict "gene map" to only a single chromosome, but others don't. Supposing we don't restrict it to just a single chromosome, is it different from "genome"? Are these ...
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1answer
23 views

Why do i feel sleepy in the afternoon?

I am a student in a cram school the workload is high so we have long classes and i have noticed after the fourty five minute lunch break eating satisfactorily in the air conditioned room i am fine and ...
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1answer
13 views

Do astrocytes connect and chemically communicate with other astrocytes?

I am building a novel model of neural tissue for the purposes of Machine Learning and am currently trying to unpick the functions of the astroglia. The literature suggests that astrocytes ensheath ...
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1answer
8 views

Glycosidation and glycosilation

I read somewhere that the function of golgi bodies is glycosylation and glycosidation. What is the difference between the two? I searched google but it gives complex answers.
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16 views

During the cleavage cycle of a zygote what determines where the blastula starts folding?

If all of the cells divide from the same zygote it seems like they should all be the same. What causes one part of the clump of cells in a blastula to start folding over to form the mesoderm and ...
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12 views

How does the glycocalyx of cells attach together if they are negatively charged?

Context Thus, the entire outside surface of the cell has a loose carbohydrate called the glycocalyx. The carbohydrate moieties attached to the outer surface of the cell has several important ...
-1
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0answers
26 views

How could I be 10% French when there's no French in my mother or father's DNA results? [migrated]

Ancestry DNA says I'm 10% French. My father never got tested, but my half sister and cousin on my father's side both tested as 100% European Jewish. My comparison to my mother (she's on the right) is ...
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26 views

What is this creature? Possibly some sort of newt

Found beside a river in Wales, about 1-2mm in length, four legs oval torso and a ridged tail roughly half its length. Most likely amphibious, possibly some kind of newt? It was very tiny and I don't ...
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1answer
36 views

Identify this insect (looks like part of a tree)?

I found this insect and thought it was part of a tree at first, then it moved and so I knew it was an insect. I've never seen it before though so I am posting here hoping someone knows what it is. ...
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2answers
62 views

Why isn't life expectancy normally distributed?

Lots of phenomenon in nature can be plotted onto some sort of normal distribution, and that makes intuitive sense to me (such as human height). Why then, does global human life expectancy drop off so ...
3
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1answer
121 views

What bug is this? Manchester, UK

The creature appears to have a green body with 5 legs of the same size, and one longer than the rest. It moved this long leg around, and it looked like it was using it to sense it’s surroundings. ...
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1answer
36 views

Effect of light intensity on the frequency of stomata

According to this article, the frequency of stomata increases with an increase in the intensity of light. What I inferred from this is, since the rate of photosynthesis increases at higher light ...
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0answers
4 views

Putting labels of different sizes on one PyMOl Object [migrated]

I'm new to PyMol (and StackExchange!) and working on my first project. I have the structure of a protein as an object, called PolyA-M, and the idea is that the residues of it are shown as spheres of ...
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0answers
16 views

LacZ gene presence in E.coli strain with Blue-White Screening

I'm not quite familiar with the concept as described in the title. Lets say one wants to use an E.coli strain as a host for a pUC-vector and you want to use Blue-White Screening. What should be the ...
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0answers
13 views

Linkage terminology in drosophila

Consider two linked loci that are 50+ map units apart. I perform a test cross between a female that is heterozygous at both loci to a male that is homozygous recessive. In this case, the phenotypic ...
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5 views

What are the chemical constituents of Spongilla fluviatilis

It's is fresh water sponge of Phyllum porifera, class- demospongiae, order -spongillida, family- spongillidae, genus- ephydatia.It's zoological name is Spongilla fluviatilis, it's synonym is ...
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24 views

Types of bonds in protein chains?

I'm trying to understand possible bonds on the protein backbone. There are a lot of hydrogen bonds and sometimes disulphide bridges. Are both of these non-covalent bonds? I've read that we also have ...
2
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2answers
40 views

Can anyone identify this insect from India?

Found this bug in Chennai. Curious to know what kind it is. Does it pose any danger?
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0answers
31 views

Linker DNA and Genetic Expression

So I was reading on linker DNA, and the textbook only describes it in terms of structure. I was wondering if linker DNA can ever contain genes, and if it can, whether it will always be expressed or ...
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0answers
32 views

Formation of disulfide bonds in protein expressed after transduction

Say I transduce a nucleic acid sequence using a viral vector that encodes a protein having at least one disulfide linkage. For simplicity, let’s assume that there are only two cysteines in the protein ...
3
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0answers
28 views

Why do some ant workers still wander at night?

As far as I have seen, the vast majority of workers in colonies of diurnal, non-nomadic species return to their nests and remain there at night. The colonies seem to forage largely during the day. ...
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0answers
20 views

Its abt a spider who is locked up inside my box [on hold]

I hve a spider locked ..up inside a box and I hve not fed it anything since three weeks..and I did feed it yesterday ..and it still did not eat the food
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0answers
43 views

What is this? I found it in tofino, Vancouver island

I'm wondering what this sea creature is that I found washed up on McKenzie beach in Tofino, Vancouver Island? It wasn't dried up or anything. I've seen hundreds before but I cant find anywhere on the ...
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0answers
13 views

What is the difference between filopodia and lamellipodia?

I'm rather new to biology (I'm an applied mathematician) and I'm currently studying models of Notch-Delta dynamics between cells with filopodia and lamellipodia. What is exactly the difference ...
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0answers
14 views

Protein A-antibody SDS-PAGE

I wanted to know whether the boiling of Protein A- antibody complex for SDS-PAGE analysis will disrupt the interaction? and result in dissociation of protein A and antibody? Thank you
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0answers
10 views

How to map A single N1-methyladenosine (m1A) by primer extension?

I want to map a single N1-methyladenosine (m1A) modification by primer extension. I have silenced a gene which is responsible for guiding modification of m1A then I confirmed the silencing. My next ...
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0answers
27 views

Where to study biology on undergraduate level? [on hold]

I hope I'm asking the question on the right place and in the right format. Anyway, I am really interested in how things work, and from that perspective I want to study molecular biology and ...
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0answers
11 views

Single cell lineage tracer

I need a Software or Python code or algorithm which can trace cell lineages. In my case the cells are budding yeast. I have already a segmentation python code and I only need to trace each cell.
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0answers
11 views

Reptation theory of polymers [on hold]

From the repatation model of DNA, we know that DNA or any polymer acts in a snake-like manner in a viscous substance. How does this reptation model help in planning the ligase reaction for a PCR ...
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0answers
10 views

What is plant motility? [on hold]

I have to briefly talk about plant motility in a presentation, but I'm not sure what to talk about. I knwo what motility is and how it works in humns, I'm just having trouble with understanding how ...
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0answers
17 views

What is the importance of magnesium ion in Ringer solution [on hold]

Please describe me that what is the importance of magnesium ion in Ringer solution?
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0answers
11 views

Unlinked SNP now insignificant after conditional analysis?

I'd like to know if two of my significant GWAS loci (p < 5E-8) independently contribute to my trait. Index SNPs for these loci are approximately 2Mb apart. According to LDLink, these SNPs are in ...
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0answers
15 views

Chickpeas as feed for house sparrows , ringneck parrots?

I've put up a bird feeder outside my house, and so far I have been feeding uncooked white rice , and the birds seem to enjoy them. However, since I read somewhere that a variety should be ...
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0answers
36 views

Can anyone identify this spider for me? [duplicate]

There is a spider on the window of my office that I've been trying to identify for the past few days but can't quite figure it out. My coworker thinks it's a Furrow Orb Weaver but I'm not sure. My ...
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0answers
39 views

Can anyone identify the insect that produce these kind of eggs?

Someone said that it was termite eggs. I'm kind of confuse so please help.
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0answers
31 views

Whenever I get viral fever,why different smell is coming while I'm excreting my fecal matter? [on hold]

Whenever I get viral fever,why I'm getting different smell while excreting my fecal matter?Is it due to the medicine I took or due to the virus which causing me fever?
4
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0answers
43 views

Inheritance percentiles

I am aware that the average DNA contribution from each grandparent is 25%, while the possible range is 0%-50%. I found a source citing 18%-32% as the "normal" range but this was undefined. I assume ...
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0answers
17 views

Do we have a language to understand DNA? [on hold]

I studied that DNA can be coded in terms base substance name to english letters and this applies to RNA as well. But do we have any next level language to understand the letters in easy way? Example:...

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