0
votes
0answers
3 views

Central Dogma of Biology - Counter Cases

I was recently reading about non-coding RNAs being a counter example to Central Dogma of Biology. We have also seen viruses converting RNA to DNA. These are the only instances I know. Can someone add ...
0
votes
0answers
4 views

Does xylitol kill all kinds of bacteria?

Xylitol is known as a bad bacteria killer in human's mouth. But I am curious about one thing. Does xylitol kill all kinds of bacteria regardless of good or bad? If so, Does xylitol kill bad bacteria ...
-1
votes
1answer
14 views

Is our genetic evolution driven by what we catch? [on hold]

When an environment changes, a multi celled organism can lose some cells without it producing an equal evolutionary change. But when a single cell organism experiences the same environmental pressure ...
0
votes
1answer
19 views

Do experiences shape actions of insects? Animals?

Would an insect behave differently to stimuli depending on what stimuli occurred to them earlier (that only affects them cognitively or their conscience)?
0
votes
0answers
13 views

Question: Finding diploid neanderthal alignment data, looking for ambiguity codes

I'm using Neanderthal alignment data from here: http://www.eva.mpg.de/neandertal/draft-neandertal-genome/data.html Specifically, the .bam files. I would like to find alignments for neanderthal ...
0
votes
0answers
11 views

house keeping gene variation under treatment

I am injecting BCG in mice ears to measure the local inflamation response in the infection side, one ear in the same mouse is kept as control by injecting PBS, in the other one, BCG is injected. When ...
0
votes
0answers
19 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
6 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
17 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
12 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 ...
2
votes
3answers
78 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 ...
10
votes
2answers
2k 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 ...
-5
votes
0answers
63 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) [duplicate]

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
16 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
20 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
31 views

Does protein structure depend on phylogeny? [on hold]

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
19 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 ...
-1
votes
1answer
31 views

How do 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?
31
votes
1answer
3k 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
23 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
15 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
17 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
45 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
85 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
63 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
23 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. ...
2
votes
1answer
35 views

Effect of pH on the hydrolysis 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
35 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
7 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
66 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
19 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
22 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
34 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
49 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
33 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
30 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 ...

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