All Questions

Filter by
Sorted by
Tagged with
0 votes
0 answers
16 views

What percentage of introns are spliced in polyadenylated mRNAs?

I am asking a variation of a previously asked question: What percentage of RNA splicing happens during transcription? I am planning mRNA purification using poly(A) antisense-oligo pull-down and, for ...
  • 1,310
2 votes
2 answers
41 views

Genotype vs Alleles - What's the difference?

I have searched through various websites, however, I am still rather confused with the difference between 'genotype' and 'alleles' since each site seems to be contradicting another site. I would be ...
  • 123
-4 votes
0 answers
35 views

Why are there no known species of "wind powered" plant? [closed]

This question popped into my mind as a worldbuilding exercise and the more I thought about it, the more aware I became of the biological/evolutionary plausability of plants using mechanical energy ...
1 vote
1 answer
44 views

What is a "marker-matched" plasmid?

I see this term used a lot in papers and have trouble understanding it. From what I have gleaned it seems they are used during control experiments, perhaps with the goal of making the control plasmids ...
  • 33
-2 votes
0 answers
17 views

Magnetic Field in the brain [closed]

Is it possible to stick a magnet to the magnetic field in the brain? If so how strong would the magnet have to be?
  • 1
-1 votes
0 answers
23 views

First Pass Metabolism, Second Pass Metabolism, and THC

First pass metabolism refers to venous blood draining from the GI-related organs, entering a portal system, and accessing the liver...all of which occurs prior to exiting the liver (via the hepatic ...
  • 373
4 votes
1 answer
228 views

Do lipids have a monomer or not?

My biology class and I have been on the topic of macromolecules for quite some time now. Chapter 2.3 of the Foundations to Biology Textbook says that lipids are not polymers, so they do not have ...
2 votes
0 answers
7 views

database of Animals/insects which would contain their queriable geographic location?

Is there a database of Animals/insects which would contain their queriable geographic location? I would need to perform a rather simple query, such as ...
1 vote
0 answers
15 views

Identification by tail feather

I saw the remains of a bird today I did not recognize and it was pretty mangled so it was hard to describe it. It was about the size of a robin. However, it had a dark brown mottled body like nothing ...
0 votes
1 answer
55 views

How common are boy, girl twins?

In the human population, if you meet someone how likely are they to be a twin with someone of opposite sex? That includes non-twins, not just people who are twins.
  • 19
1 vote
1 answer
29 views

"mutant" codon translations?

AFAIK codon->protein translation is pretty much universal (very few exceptions). I've seen people explaining this means every living organism descends from the same ancestral. That's certainly a ...
  • 169
1 vote
0 answers
30 views

Snake Identification in India

Location: Kharagpur, West Bengal, India. Time: Near the end of September at around 1:00 pm. This snake was spotted in a drain near my hostel in Kharagpur, West Bengal, India. Can somebody help me ...
0 votes
0 answers
7 views

Does kingdom animalia have Saprophytic mode of nutrition [closed]

Do kingdom animalia have saprophytic mode of nutrition if yes elaborate with some examples
  • 1
0 votes
0 answers
11 views

What is the difference between physiology and physiological processes?

Now I do understand that physiology is the study of processes and mechanisms that make a living organism. And physiological process is understanding the ways the components in the organism work ...
  • 1
2 votes
0 answers
28 views

Purple caterpillar found in Peru rainforest

Caterpillar fron Peru rainforest with purple body and orange or reddish tips. From Manu National Park
  • 413
-2 votes
0 answers
40 views
+50

Is likelihood of survival of an individual of a social species more than of non-social during the rapid ecological change?

Here are the facts that i already know: Species evolve reciprocal altruism, which increases the possibility of an individual within that species to survive and thus species become more social For ...
  • 47
5 votes
1 answer
50 views

What is the species of this small bird in Germany?

I've recently (Steptember 2022) found this little guy in Frankfurt (Germany) in the morning. It could have fitted in my hand. It was staying very clam on the ground so I could go really close and take ...
  • 1,553
4 votes
1 answer
180 views

Why does high redox potential mean less oxygen?

I often see statements about adding reducing agents like cysteine to anaerobic medium to decrease the amount of the dissolved oxygen. However, I am not sure why. I am wondering if it is because under ...
-1 votes
0 answers
18 views

Reproduction, sexual and asexual, and cloning, and species survival

Please migrate my post to philosophy stack exchange of not appropriate. Can someone prove to me that by having sexual reproduction the survival of life is enhanced when compared to if everyone cloned ...
0 votes
2 answers
73 views

Can gene mutations cause Down's syndrome in humans?

I am working on an A levels questions: Which of the following statements about gene mutation is incorrect? A. It can occur in both somatic and sex cells B. It can cause Down's syndrome in humans C. ...
0 votes
0 answers
22 views

Enzyms connected with the MHC: Who knows? [closed]

Surely there are -ases connected exclusively to the sense of smell (and especially the part dealing with the major histocompatibitily complex). Or at least nonexclusively. Unfortunately, googling ...
-4 votes
1 answer
60 views

Does children have a gender?

I heard that a male is a human which produces smaller gametes and a female produces bigger gametes (Hanna Kokko and Katja Bargum: Kutistuva turska ja muita evoluution ihmeitä, a Finnish nonfiction ...
-2 votes
0 answers
27 views

Please Identify [closed]

I feel I have a parasite. Dr's have yet to diagnose. Started 2 years ago with a very itchy spot on my bicept.It has settled into my face and I can't get rid of it! I pulled this out of my face! Help ...
  • 1
-1 votes
0 answers
52 views

Account of cats selectively bred for intelligence?

One time I saw an account on some website somewhere of someone - I think, though I'm not sure, that she was an academic of some sort, though I'm not sure whether a scientist or not - who had ...
  • 125
3 votes
1 answer
163 views

Function of SMAR in plasmids?

A few years ago, the Thought Emporium published a video (https://www.youtube.com/watch?v=aoczYXJeMY4) in which he refers to a study in which they mix plasmid DNA with Chitosan and feed it to mice to ...
-2 votes
0 answers
27 views

Is there any 3D anatomy of the Earth with up to cellular-level precision zoom-in? Like Google Earth, but for the body?

I mean as in, you could zoom all way in from the 3D view of the body, to the eye, to the retina, to individual cone cells, to the nucleus, to the DNA all the way to the atoms that compose it. And it ...
1 vote
1 answer
40 views

(Why) can't blood sugar spikes be countered by consuming fiber generally?

Excessive sugar consumption is a widely-acknowledged problem in the modern Western diet. One of the specific problems often stated is that the quick consumption of highly sugar-laden foods leads to ...
2 votes
1 answer
23 views

How well do ants and other insects smell odors other than pheromones, or are they highly tuned to pheromones only?

I have a vague understanding that ants and moths use pheromones in a variety of ways, but recently after a heavy rain my office is being explored by a some small ants looking for food. They decided it ...
  • 121
1 vote
1 answer
39 views

Determine acidification of milk (no-probe/contact/destruction)

For a project, I am trying to figure out if it is possible to determine the acidification of milk without probing, touching, destroying or opening the sample, thus leaving the sample inside the ...
  • 11
1 vote
1 answer
30 views

What is this mushroom in Illinois?

I live in the Northwest suburbs of Illinois and we moved into this house last year. I noticed these mushrooms popping up in one corner of my yard and I’ve never seen this type before. They don’t seem ...
  • 31
0 votes
1 answer
33 views

Protein crystal X-ray diffraction at room temperature?

It seems essentially all protein X-ray diffraction structures are obtained with flash-cooled protein crystals (in a stream of very cold gas). I’m curious if the diffraction pattern would be ...
  • 412
10 votes
2 answers
2k views

Conifer with red fruit

What kind of conifer is this? Red fruit Broad needles; not clusters 12 feet tall; north wall of apartment building East of Toronto, Ontario September 20, 2022 Hint: click the photos a couple of times ...
  • 640
2 votes
1 answer
20 views

Caudex vs Xylopodium difference

I live in Brazil and many plants from the brazilian grasslands/prairies exhibit an structure called, by the brazilian literature, "xylopodium" (or "xilopódio" in portuguese) - ...
4 votes
1 answer
89 views

Where does (retro)virus replication take place?

When a virus replicates, it has to create several copies of its genome to the "daughter viruses"? Where in the cell does this replication of the viral genome take place? And how? In my book, ...
-2 votes
0 answers
25 views

What is the correct word that subsumes all the following: gene, fusion, translocation, locus

Hi molecular biologists This is a bit of a different question, but there is no easy way to google for this. I am trying to create a data model for all somatic and germline molecular alterations. The ...
1 vote
1 answer
41 views

Are gene conversions and expansion/contraction of repetitive (satellite) DNA examples of directional, non-random mutations?

Are gene conversions and expansion/contraction of repetitive (satellite) DNA examples of directional, non-random mutations? For some context, it was brought to mind as a result of reading the ...
  • 520
3 votes
0 answers
31 views

ID Large, broad flat bone found in Gulf of Mexico [duplicate]

`1 Is this a tooth? A rib? Or a fish? I found this in about 4’ of water in the Gulf of Mexico/Galveston. It is slightly curved and the side edges have numerous pointy parts. On one side at the bottom ...
  • 31
-2 votes
0 answers
64 views

Is our brain really getting less blood than ideal due to gravity?

The fitness world advocates for headstands, handstands and other similar "keep your body upside down" positions with a common claim: When you turn upside down, you are increasing the blood ...
6 votes
2 answers
108 views

Graph of new species discovered per year

I'm looking for historical data on the number of new species described each year. I found the RetroSOS report (page 3), which provides a time series for 2000–2009: ...
  • 163
8 votes
1 answer
141 views

Identification of a strange skull

My father is a fisherman in the Baltic sea, and he has found this very strange skull. I would like to know to which animal it belonged. Can someone help identify it?
-2 votes
0 answers
12 views

Are proximal fingerprints and wrist prints unique to every human?

Are proximal fingerprints and wrist prints unique to every human? Just like the distal fingerprints are unique to every human.
-1 votes
0 answers
45 views

How quickly could mice evolve to avoid mousetraps through artificial selection?

So, we have a mouse problem in our attic. I set traps routinely to keep the population down. We have taken pains to exclude them by sealing cracks and holes, etc., but they still manage to find ...
-4 votes
0 answers
28 views

What if I someone drinks demineralised water? [duplicate]

It's a recreational question, but I'm really curious about it. I do not recommend doing this, of course, nor to taste yourself each of your household products, but I'm wondering: When I buy a bottle ...
0 votes
1 answer
41 views

Additional to SNP (variant) calling, what is genotype calling in human genome?

Variant calling in human genome aims to determine in which positions there is polymorphic site or in which positions at least one of the dna bases differs from a human reference genome. Then beside ...
2 votes
1 answer
105 views

Koshi and Goldstein substitution matrix

In their article (Context-dependent optimal substitution matrices for exposed residues (Koshi-Goldstein, 1995)), more precisely in the substitution matrix displayed in Figure 2, one one hand, the ...
1 vote
0 answers
35 views

Explanation for the results of Topoisomerase I treatment of ERCs - Gel Electrophoresis

This part of a 1997 paper published in The Cell (David A. Sinclair & Leonard Guarente, 1997) discusses the presence of extrachromosomal rDNA circles (ERCs) in greater numbers in old mutant yeast ...
  • 33
0 votes
0 answers
14 views

why do spirogyra turn brown after formation of zygospore?

in the sexual reproduction of spirogyra, the reproductive parts of the 2 spirogyras come together to form a structure called zygospore. after this formation spirogyra turns brown. why is it so? i want ...
  • 1
0 votes
0 answers
18 views

Why’s brush bordered columnar epithelium found in intestine and not brush bordered cuboidal when I’ve been explained that they have the same function?

I searched for differences between their functions which would result in their positioning but none of it satisfied the answer to my above question.
3 votes
1 answer
59 views

Do cancer cells use as much NADH as normal cells?

Recent literature shows that cancer cells have a different electron transport chain mechanism from normal cells and both of cancer cells and normal cells use NADH as electron donors. So, is there a ...
  • 39
2 votes
1 answer
40 views

Why aren't complex-stabilizing proteins like transcription factors considered catalysts/enzymes?

I'm not asking the question on a superficial level. Obviously, (most) transcription factors are not acting directly on a substrate to produce a chemical change. I pose the above question as more of a ...

15 30 50 per page
1
2 3 4 5
550