0
votes
0answers
4 views

Typical run-times for local alignments?

Suppose I have a relatively short sequence, e.g. 100 base pairs, which I attempt to align locally with the entire human genome that has approximately 3 billion base pairs. How long would such ...
0
votes
0answers
4 views

siRNA to reduce global cholesterol levels

I need to reduce global cholesterol levels significantly while maintaining cell viability. I am working with HEK293 fibroblasts so that shouldn't be a problem. What is the best target for an siRNA ...
0
votes
0answers
10 views

What reason that land vertebrate evolve keratin while other animal use chitin

I don't know why there are evolutionary split in material. Why we evolve keratin and lose chitin? What the advantage and disadvantage for each material? Is it because the size or there are other ...
1
vote
0answers
6 views

Why my proteins are migrating like this on SDS-page?

I'm trying to make a SDS-page of total proteins extracted from algae but I'm encountering two problems. First, when I depose my proteins in the wells the sample goes down and then it starts to move up ...
1
vote
2answers
44 views

Real-world examples of Darwinian extinction

Darwinian extinction (also known as "evolutionary suicide") refers to processes of selection-driven self-extinction, i.e. the cases where natural selection causes the extinction of an evolving ...
5
votes
1answer
334 views

How do we know that our genetic similarities to other species is actually due to common ancestry?

I know all about how the fossil record shows more human-like species coming about over time, and how modern testing proves we have genetic similarities with other animals. All that says is we have ...
-4
votes
0answers
33 views

evolution in such a short time? (history is too short for DNA base mutation + natural selection to result in current vast number of species)

apart from my being a Christian, I have this strong suspicion that evolution is wrong. One of the clues is the mismatch between the past time lapse and the current level of evolution. I'm not a ...
0
votes
0answers
6 views

Which behavior, in the evolution of human species, came first: organized sports or organized religion? [migrated]

In Brazil, and I believe that also in other countries, people will change their religion, but won't change their sports team. Would it have any root in biology? Perhaps because sports represent a much ...
0
votes
1answer
14 views

Human Blood vessels, [duplicate]

Why is blood drawn from veins? Is it because veins have a large lumen? Or is it because the blood is flowing at a lower pressure and makes discharge easier? Is it safer to draw blood from veins?
-1
votes
0answers
16 views

KEGG Pathway Database

KEGG is a total black box to me. I'm trying to understand the "schema" / organization of KEGG. I want to find connections between KEGG Compounds with KEGG Genes. Which KEGG class will give me this? ...
-2
votes
1answer
27 views

Does protein structure depend on phylogeny?

Proteins have two basic secondary structure forms - beta strand and alpha helix. Do these depend on the organism or do the two forms exist for every protein? For tertiary and quaternary structure: do ...
1
vote
0answers
16 views

Sneezing as sign of allergy

Doctor told me (long ago) that sneezing more than three times in a row is a sure sign for an allergy. Now, me, if I have to sneeze, I rarely do with one sneeze, mostly, when I've made up my mind and ...
0
votes
0answers
2 views

Innervation ratio

Is the innervation ratio the number of muscle fibers/neuron or the number of neurons/muscle fibers? My book doesn't define innervation ratio but mentions ratios: In primates the number of muscle ...
0
votes
1answer
9 views

How to poikilotherms thrive in a wide range of temperatures?

What is it about the metabolism of a poikilotherm that enables them to adapt to the surrounding temperature?
30
votes
1answer
2k views

What is this wasp killing insect?

I spotted these two in my garden. What is this insect? He had firm control over the wasp and was just hanging on by one leg. He appeared to hold on until the wasp stopped moving and then flew away ...
-2
votes
0answers
21 views

One blue and one brown eye. What's up with that? [on hold]

I am studying Mendelian genetics -> Punett Square , but no match is there for below: One of my best friends in elementary school had one blue and one brown eye. What's up with that?
0
votes
0answers
13 views

Simple test data for learning local sequence alignment

I would like to obtain some published sequences for learning local sequence alignment. Where could I obtain a set of published sequences (of e.g. dropsophila) and some shorter sequence (which I would ...
0
votes
0answers
14 views

X-linked Traits in Males and Their Effect

Let's say you're a male and you're hemizygous for an x-linked recessive trait (i.e. Haemophilia), will you express that trait? A question from my textbook can be paraphrased as follows, Tom and ...
-4
votes
0answers
16 views

What would happen if molluscs didn't have shells? [on hold]

If a mollusc lost its shell for some reason, what would happen The mollusc must have had the shell before it got lost, so ones that didn't have shells to begin with don't count
-1
votes
0answers
17 views

Do molluscs shells regenerate?

Does a molluscs, for example mussels, shell grow back? Because it will obviously be degraded with time, what with ocean acidification and such. But can the organism grow the shell back? If so, how ...
0
votes
1answer
42 views

Why aren't all animals cold blooded?

At least, why don't all animals produce no more heat than the tiny amount that's a byproduct of walking or a bonobo climbing up a vine when the outside temperature is above 0°C? They won't freeze ...
-4
votes
1answer
79 views

Mutations, Death and the theory of Evolution [on hold]

Evolution always made sense to me and I still find it to be true. However, I quite recently found a comment online that gave me some doubts and made me curious on the subject. Although a student of ...
6
votes
3answers
57 views

ID flying insect found in Belgium

I live in Belgium, and I've just witnessed a weird looking wasp/fly flying around in my room. Here's a picture: So, what's this? It's still in my room, just chilling there. It zooms like a wasp, ...
3
votes
1answer
21 views

How do antibiotics combined with a non-Western diet affect weight loss?

Wikipedia describes a Western diet as: ... higher intakes of red and processed meat, butter, high-fat dairy products, eggs, refined grains, white potatoes, french fries, and high-sugar drinks. ...
1
vote
1answer
24 views

Effect of pH on stability of ATP

ATP hydrolizes to ADP and phosphate in a strongly exergonic reaction and is used for energy transfer and short-term storage in cells. ATP is stable inside a cell, so a significant activation energy ...
3
votes
0answers
33 views

Is this some sort of fungus?

There is something strange growing straight out of the glass windows at work. They look like hairs, about half an inch long, and each have a white spot on the tip of them, slightly weighing them down. ...
1
vote
0answers
21 views

Do users of CRISPR/Cas iterate or parallelize to try multiple guide sequences?

I've read about on-target efficiency and off-target effects in use of CRISPR/Cas9, and about tools that suggest good guide sequences. I am wondering: how many guide sequences do typical CRISPR users ...
1
vote
0answers
6 views

How does having an empty stomach affect absorption of compounds?

From personal experience, compounds such as nicotine, caffeine and alchohol appear to absorb much quicker into the blood on an 'empty' stomach', or after extended periods of fasting. If this is the ...
6
votes
1answer
59 views

What is this tiny insect?

I took this picture in central Mexico. The insect is about 1mm in size. I found lots of these dead on a desk, so many that at first I thought they were just dust. I assume they came from a plant that ...
0
votes
0answers
18 views

Why do halophytes have pneumatophores?

The following is a excerpt from Studies in Botany The problem of respiration is a matter of difficulty in the soil which is saline, water logged and rich in putrefying organic bodies-hence poor in ...
-1
votes
0answers
21 views

What are the differences between good (pathogens) and bad (beneficial) bacteria? [on hold]

What are the main differences between pathogens and beneficial bacteria? Is it the only difference that one create a poisonous waste material and other not, or there is something else?
-2
votes
1answer
41 views

Selectivity of anti-bacterial affect of oxygen

As far as I know, oxidizing agents (AKA reactive oxygen species or ROS) are potent antimicrobial agents that act on a broad range of bacteria and viruses, as well as inactivating certain toxins. Is ...
-1
votes
0answers
13 views

Why can Neural Stem Cells be attracted to specific sites in the brain?

Neural Stem Cells (NSCs) have recently attracted attention as an innovative way of the cell therapy. NSCs have a highly migratory capacity and are attracted to the site of a brain pathology. Because ...
0
votes
0answers
4 views

Switching of life cycle Lambda phage

Hello everyone iam very curious to know how the lambda phage switch their life cycle (lysogenic and lytic cycle). I want to know the detailed mechanism by which this switching occurs in the phage.
0
votes
0answers
12 views

Loss of HBV Immunity

I had a full course (three doses) of Engerix-B in 2011 and 2012, but recent blood tests show my anti-HBV antibody titre is very low, so I just had a booster dose. This isn't the first time something ...
0
votes
0answers
18 views

Function of the centriole

My bio text book says Centriole is like the Nucleus of Centrosome What does this mean ? I'm a bit confused.
1
vote
0answers
9 views

Haploview command line: how to get tagSNP

I am trying to use Haploview command line software to compute haplotypes and extract tagSNP for those. When I use the standalone version on my local computer I tick the 'Show tags in blocks' option so ...
1
vote
1answer
33 views

Name of this flower?

i'd like to know the name of this flower.
0
votes
0answers
24 views

generating grid around the protein

I am trying to generate a grid around my protein. Can you please help me with thatn ? I read your post saying it is possible to do that using PyRosetta. Can you please help me with that , how to do it ...
5
votes
2answers
46 views

Identification of an insect from Florida

Any entomologists or there that can identify this bug? I live in north Florida, found this guy in my bedroom and thought it was a bedbug but I think it was too big, about half an inch long.
4
votes
1answer
23 views

Why does the cloned cat, CC, exhibit mosaic fur color?

Since fur color in this cat is from a sex-dependent gene, I see how calico cats occur. However, I don't fully understand why it happens in cloned cats. When the cat is cloned, the DNA is taken from a ...
0
votes
1answer
32 views

What is the best way to analyze non-quantitative mass spec hits from an immunoprecipitation pull down?

I am studying a nuclear protein and want to come up with a list of potential proteins that it interacts with. From the nuclear fraction of 293T cells, I did an IP (immunoprecipitation) to pull down my ...
3
votes
1answer
23 views

How specific are CRISPR-cas9 cuts?

CRISPR-cas9 uses a string of RNA that matches with DNA and makes a double stranded cut at that point. If the RNA is just a few letters in length, the enzyme would cut DNA in many places. It would be ...
3
votes
0answers
26 views

Venom Denaturing with Heat

My friend got stung by a stingray yesterday and the lifeguard quickly stuck her foot into hot water (she said the water burned slightly on contact) and remarkably, she was walking without pain in a ...
0
votes
0answers
15 views

What's the best way of generating high yields of mitochondrial DNA

I want to extract mitochondrial DNA from a fungus, but there are two ways to cultivate the fungus, one is to cultivate it on an agar medium (covering a piece of cellophane paper to stop hyphae to grow ...
0
votes
1answer
57 views

What did young pre-mammals eat before milk evolved? [on hold]

Mammals tend to be born helpless and teeth-less (and in some cases, blind). So for the first periods of their lifetime, they drink milk. Before this milk-producing property was evolved, what did the ...
1
vote
0answers
17 views

How do the chemical components of these spices prevent fungal growth?

I am doing an EE on how spices affect fungal growth for the following spices - oregano, garlic, cinnamon, cumin and turmeric. Its been hard to find any sites that say why or how they affect fungal ...
2
votes
1answer
46 views

What might this animal be?

I have found two species of this strange looking animal on the Eastern shore of the Adriatic Sea and I was simply unable to recognise them.
3
votes
1answer
50 views

Why do people sing?

I was wondering the why people sing, but from a biological point of view. Is it necessary for our body? If it is so, then why can't everyone sing well? Is it in direct relation with neurotransmitter ...
1
vote
0answers
17 views

Can 3% hydrogen peroxide be used as effective disinfectant and antiseptic?

I was curious to see whether 3% hydrogen peroxide can be used as antimicrobial and virucidal product for daily use in home. There are several disinfecting products in the market claim that use of ...

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