0
votes
1answer
21 views

Density of Receptors of a mammal

I know it's a very open question. It's for a paper. So as a reference I'm looking maybe for the average density of insulin receptors per cell of a human tissue. I want to compare it to the density of ...
0
votes
0answers
20 views

plant total DNA electrophoresis

Why does plant total DNA migrate as a single band in agarose gel after electrophoresis, and what kinds of DNA (single, circular, supercoiled, ...) are present in total DNA preparation? Thank you
0
votes
1answer
18 views

How to recognise the type of allele by pedigree analysis diagrams?

It was said that this interference pattern is due to dominant allele. I fail to see that. In general how to recognise the type of allele by pedigree analysis diagrams?
2
votes
1answer
90 views

Why is the manchineel tree so poisonous?

The machineel tree is incredibly toxic to humans. What advantage could Hippomane mancinella have for being so poisonous? It's name even apparently translates to “little apple that makes horses mad”. ...
3
votes
2answers
42 views

Do disaccharidases require a cofactor or coenzyme to function?

I'm doing research on lactose intolerance and am curious if disaccharidases (enzymes that break down disaccharides) require a cofactor or coenzyme to function? Reviews or references would be greatly ...
0
votes
0answers
16 views

What happens to a person's neurons during a paralysis stroke? [closed]

What happens to a person's neurons during a paralysis stroke?
3
votes
1answer
118 views

Why Crocodiles don't eat Hippos?

I have been following documentaries about crocodiles and amazingly, crocodiles and hippos apparently seem to live happily in the same pond together without attacking each other. Why is it so? Like ...
0
votes
0answers
20 views

Hybridization of an Indo-Aryan ethnic group and a Tibeto-Burmese ethnic group

The state in which I reside houses these two distinct ethnic groups. Physical Traits of the Indo-Aryan group Height:Medium Eyes:does not posses epicanthic fold Nasal bones:is not flat and broad ...
0
votes
0answers
7 views

Obout oxygen presence in krebs cycle [duplicate]

Q- If oxygen is not utilized in the cycle then why it is present in the Krebs Cycle?
1
vote
0answers
16 views

What is this insect found commonly in coastal India? [duplicate]

I have lived in two cities on the western coast of India and I have seen quite a few of these insects(?) in both places. It basically has an outer cocoon of sorts, which looks a lot like dirty ...
4
votes
1answer
35 views

Do animals' facial expressions have similar meanings to humans'?

In the following pictures, the dog seems to be smiling to the camera. People staring at these picture also tend to feel comfortable and relaxed, presumably because they think it's very happy playing ...
0
votes
1answer
50 views

Examples of biological turing machines [closed]

Are there any examples of biological Turing machines? And what can they do?
0
votes
1answer
54 views

Beta Sheets vs Alpha Helix - Strength

Is there a hard and fast rule of which one is stronger than the other, or does it depend on their context in a protein?
1
vote
3answers
77 views

What is the actual storage form of energy in muscles? ATP or Glycogen?

I was asked this question in my latest exam. I think the answer is Glycogen because ATP doesn't store energy for a long time so it isn't the ACTUAL storage of energy. Some classmates argue that in ...
0
votes
1answer
61 views

What percentage of a Neanderthal's DNA could be in a Denisovan?

My questions arose from an online course video at 3:11-19 The professor mentioned that the Neanderthals were inbred with their cousins breeding together but the Denisovans were very diverse , with 70%...
0
votes
0answers
39 views

Can defibrillation (cardiac arrest treatment) be done with a vehicle spark plug? [on hold]

Can successful defibrillation (restarting the heart after cardiac arrest) be done with a spark plug from a vehicle (possibly offroad vehicle)? Is it POSSIBLE for this to work? Let's say you are stuck ...
5
votes
2answers
54 views

Insect making continuous sound in summers

In deciduous to tropical-deciduous forests and residential places with such vegetation I have found this insect to make continuous sounds all through the day (even in nights sometimes) during the ...
0
votes
0answers
14 views

What are extracellular matrix pathways?

I was reading a research paper dealing with acute myeloid leukemia and the term "extracellular matrix pathway" came up. What does it mean? I found literature on extracellular matrix, but I'm not sure ...
0
votes
1answer
24 views

Are antibiotic-resistant bacteria necessarily less virulent than their original strain?

In the absence of antibiotic treatment, is there a reduction in the average severity of disease caused by resistant strains of pathogenic bacteria compared to wild-type ones? I would assume that ...
1
vote
1answer
20 views

How to calculate apparent diffusion coefficient (ADC) with example?

Can someone give an example calculation for the apparent diffusion coefficient (ADC)? There appears to be multiple ways that this can be calculated, e.g. as discussed here: http://www.ncbi.nlm.nih....
-2
votes
1answer
66 views

What was the precursor of testosterone? [closed]

Testosterone evolved about 500 million years ago (says 8fact.com). What was the precursor of testosterone (if any)? If possible, what caused the 'precursor' to evolve?
-1
votes
1answer
41 views

How does imatinib recognize the constitutively active Abl-BCR even though it binds to the inactive conformation?

In chronic myelogenous leukemia (CML) ABL-BCR is constitutively active (always on) and it can be inhibited by imatinib and dasatinib. A study says that imatinib binds to the inactivated state of the (...
-1
votes
1answer
23 views

How are unnatural amino acids modelled using insilico tools?

When the structure of an unknown protein containing amino acids other than the 20 known natural amino acids is modelled which method is primarily used in bioinformatics to solve the structure? what is ...
0
votes
2answers
29 views

Energy coupling between two spontaneous reactions?

This diagram describes energy coupling between a nonspontaneous reaction (the formation of glutamine from glutamic acid and ammonia) and a spontaneous reaction (the hydrolysis of ATP). I can see that ...
0
votes
0answers
12 views

optimization of density gradient centrifugation

I'm trying to isolate a ~320kD protein (in oligomeric form) using density gradient ultra centrifugation technique. Can any one tell me that what gradient (sucrose or glycerol or trehalose or etc) I ...
1
vote
1answer
65 views

How do heredity and regression to the mean work with respect to intelligence?

I am trying to understand the heredity of intelligence between generations in general, and how regression to the mean works in detail in particular. The answer I'm looking for should preferably answer ...
1
vote
2answers
53 views

What´s the origin of junk DNA?

Most eukaryotes posses a certain amount of junk DNA in their cell nuclei. What is (are) the origin(s) of this junk DNA, And is it realy junk (superfluous)?
0
votes
0answers
29 views

How do I know if the tRNA gene is under purifying selection from looking at a sequence dataset?

I'm having trouble figuring out how to tell if a tRNA gene is under purifying selection, just by looking at its sequence dataset. Such as this one:
0
votes
0answers
17 views

How to Determine Sufficient Time for Melanoma Survivor to Be Considered Low Risk?

Regarding melanoma, how do we determine the minimum amount of time that a patient is disease free for them to be considered low risk? We are attempting to do survival analysis on RNASeq data from ...
1
vote
1answer
12 views

How do molecules signal pre synaptic neurons to activate? [closed]

How do molecules signal pre synaptic neurons to activate? and also is it more the structure or the elements in the molecule that allows it to activate the neuron also how do molecules bind to ...
0
votes
0answers
13 views

Why is your taste affected due to sinuses?

I heard someone say "My sinuses are acting up, I cant taste the food." I dont think the person is lying, they probably believe this but I'm having trouble seeing how the sinuses would affect the taste ...
4
votes
1answer
33 views

Need Help Identifying this Critter (Insect?)

This creature is hanging out on my kitchen window. I live in Western Maryland, US, near the Potomac River. The creature is about 3 inches long (measured from tip of mandibles to tip of tail). Does ...
1
vote
0answers
16 views

Is Valerian diuretic or antidiuretic

Hello i wanted to take valerian to calm me down on stress situations, and also using it as an antidiuretic, but i have seen forums where people say it acts as an diuretic, and others where they said ...
0
votes
0answers
14 views

What is the difference between desert and migratory locust?

I know both are species of short horned grasshoppers and belongs to the orthoptera order, Acrididae family and so on. But what is the difference between desert and migratory locust? How do we ...
0
votes
1answer
32 views

What is the meaning of a reported OD600 value?

I can't find a reference that explains what, for example, OD600 = 0.1 means. For example, Wikipedia states OD600 is an abbreviation indicating the absorbance, or optical density, of a sample ...
0
votes
2answers
44 views

DNA replication in E.coli

What is the difference between replication and to divide? My A level bio book says that it takes 20 min for E.coli to divide and in next page it's written that E.coli completes replication within ...
3
votes
3answers
148 views

How is the size of a gene defined?

Is there an agreed definition as to how many nucleic acid bases constitute a gene? If not, why not? I'm not sure I understand how the exact sizes of genes are defined.
-2
votes
1answer
66 views

how did the domestic dog evolve and was the role humans played in its evolution justified? [closed]

Humans have been selectively breeding dogs for a long time. Why do we do it? What are the positive and negative impacts of selective breeding and why do they occur? I am writing an independent ...
3
votes
0answers
57 views

In vivo delivery of ssDNA

I am looking for a system with which I can deliver (large quantities of) ssDNA in vivo (say in mice). I do not know whether it is of importance but the 5' end of the ssDNA fragments are assumed to be ...
-1
votes
0answers
29 views

Where does transamination and deamination take place?

The only information I know is about deamination,it occurs in the liver and kidney. But in which part of the cell does deamination occur? To which tissues is transsamination specific to and in which ...
3
votes
1answer
36 views

Why does migration distance depend on log of molecular weight in SDS-PAGE?

I really want to know why in the result of SDS PAGE, log of molecular weight(MW) and migration distance (distance from the loading well) have a linear relationship. Why is it log(MW) instead of MW? ...
0
votes
1answer
40 views

A diagram of a crossover [closed]

How can one draw a crossover between ABK and aBk where genes A and B follow the Mendel's law of independent assortment and gene K does not i.e. K is linked to B?
-1
votes
2answers
36 views

Is there software or a website where I can browse extinct species?

Is there any software/website where I can browse for extinct species? It must be based on real animals that are now extinct. It may be in animated versions.
-2
votes
1answer
44 views

Would someone lose some of their traits if they stop using them for some time? [closed]

A co-worker of mine told me, that there are some mutations in the genome during the life of a human body. So, the body changes genes to fit better into the surrounding environment. My thought is now, ...
0
votes
0answers
28 views

What empirical evidence of genetic assimilation is there?

There have been many articles arguing that we should view the phenotype in the center of evolutionary theory rather than the genotype as done in most population (or quantitative) genetics. A typical ...
3
votes
1answer
29 views

Is this modification of Livak's 2-delta delta CT method valid?

I have done a modification to include qPCR efficiency in the calculations: In a given gene I calculate the fold changes relative to an arbitrary sample. That sample will be one and the rest will ...
3
votes
1answer
52 views

Perplexing by the way of estimating the shared or different genes between humans and chimps

We share 98.5% genes with chimps (it means we have 98.5% same DNA sequeces ),so there is about one percent difference .It means we can approximately differ from them by one base pair every hundred ...
1
vote
0answers
17 views

Are there any individual animals that can thrive in a wide range of core temperatures? [closed]

Surely, some cold blooded animals are in a position where they can't escape the changing temperatures the environment throws at them, so natural selection would have enabled them to thrive in a wide ...
5
votes
1answer
36 views

How allele is related to trait that is more complex than two cases (ex. height)?

Recently I started to learn about evolution and genetics. Simple stuff at the beginning - some videos, some reading. So far, everything seems to be pretty simple and straightforward. I easily grasp ...
1
vote
2answers
65 views

Relationship between DNA strands and mRNA

Does the sense strand or antisense strand of DNA code for the polypeptide product? I'm confused because I know the antisense strand is the template for mRNA but it has anti codons so I do not know how ...

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