2
votes
1answer
30 views

What constitutes as the death of a bacteria?

I've read that some bacteria can survive a long time without food. What constitutes the death of a bacteria ? What process needs to take place for it to be considered dead?
0
votes
0answers
20 views

A question about cat coat colour genetics

I have a question about cat coat colour genetics. Concretely, the breed Russian Blue comes in several colours. The desired colour is "blue" which is black diluted and is recessive. See for example ...
0
votes
0answers
7 views

How can I verify the long term bio compatibility of an implant?

Is there a technique to find out if a material coating is biocompatible? One obvious method is implanting the object and waiting, but this carries massive risks and should not be attempted.
0
votes
1answer
34 views

How to prevent a old promoter region from attaching onto a plasmid instead of a new one during ligation?

What I am trying to do is take out a existing promoter region in a plasmid, and replace it with a new one. So first I use the appropriate restriction enzymes to get rid of the existing promoter region....
3
votes
1answer
60 views

What is the name of the bird which feeds on penguin blood and meat in Tristan island?

I just watched a National Geographic documentary "Unseen Islands: Atlantic Arks" and there was some thing strange in Tristan island. Some small bird which changed its diet to feed on the blood and ...
3
votes
3answers
72 views

Can plants grow without photosynthesis?

Animals can survive without eating if nutrition is injected directly into their blood. Can the equivalent be done with plants? By injecting carbohydrate rich nutrient solution, either without ...
0
votes
1answer
24 views

Confusion over equations for population's heterozygosity vs. heterozygous individuals

On page 24 of Gillespie's Population Genetics, 2nd ed, an equation for $H$, the probability that two randomly drawn alleles are different by state, is given. $H$ is stated to be similar to the ...
2
votes
0answers
14 views

Where should I go for online information on animals endemic specifically in Mozambique?

I've been involved with the citizen science project "Wildcam Gorongosa" for over half a year now (website, forum). As there are lots of unexperienced volunteers, many questions are being asked. Often ...
2
votes
1answer
47 views

Is there a certain environment where all cellular functions (or at least some) increase their rate?

Is there a certain environment in which all the functions (or some) inside a cell increase in their rate? Would the increased rate cause any damage to the cell?
1
vote
1answer
24 views

Breathing's Role in Aerobic Respiration

It's my understanding that aerobic cellular respiration is summarized in the formula $C_6H_{12}O_6+O_2→CO_2+H_2O+ATP$ (unbalanced). The glucose is thrown through a series of chemical reactions, ...
-1
votes
2answers
53 views

Assume the gene for freckles is dominant. A woman with freckles has a son that does not. What would have to be the genotype of the mother? [closed]

I need help understanding the question I guess. I have read the chapter in my book but still confused.
1
vote
0answers
14 views

Why doesn't Poison Ivy cause a reaction under one's fingernails?

Okay, so I pulled up a bunch of Poison Ivy last week and I got itchy up and down my arms. I scratch and I think that causes the oil to spread causing more misery. However I notice that I don't get a ...
0
votes
0answers
23 views

What are the real chances of HIV transmission? [closed]

I am really confused about this matter (as far as transmission via sexual intercourse is concerned). I've heard a lot of versions from doctors and on internet. To be more specific: A pathologist ...
0
votes
0answers
22 views

How do implantable devices interact with the human body?

Are there some general methods to prevent biochips implants for unwilling recipients? If implantable devices are embedded in the human body, how does the human body detect and react to foreign ...
1
vote
1answer
23 views

How do you call the species that gives its name to a upper-level clade?

Just a silly question: I don't remember how the species giving its name to an upper-level clade is called. e.g. the name of family Canidae derives from Canis lupus You could say it is the "name-...
0
votes
0answers
34 views

Adaptation by standing genetic variation and fitness variance [duplicate]

I've read a couple of paper on Fisher's Fundamental Theory of Natural selection that states: $W(t+1) = W(t) + Var_{W}(t)$ Given a population with some degree of genetic variability, and assuming that ...
1
vote
0answers
31 views

Fabric melting spider juice

I live in the southern rocky mountains of Canada. I was in bed the other night when I saw a small scurrying shadow out of the corner of my eye. The source of the shadow was a small spider (95% sure it ...
1
vote
0answers
16 views

Dopamine receptor count: Role and Measurement

Can the Dopamine (DA) receptor count take a significant drop over the course of life or does it stay constant? I read that low D2 (Dopamine receptor type 2) receptor count does not cause Parkinson's ...
1
vote
0answers
43 views

Need Help on a Biology Question about Pedigrees [closed]

I was given a biology question that says: "Which of the following pedigrees could occur if the shaded individuals show an X-linked dominant trait and partially shaded individuals are unaffected ...
0
votes
0answers
16 views

Year 11 Seed Germination EEI ideas

I am doing an EEI on the effect of salinity on the germination of seeds (mung beans) and I need another element to increase the experiment difficulty. Would someone be able to assist me in adding this ...
1
vote
1answer
36 views

Are a bonsai tree and its normal version the same species? [duplicate]

I would like to know if bonsai type of a tree is a separate species from its normal version. Do they differ by genes, or is it just a matter of different physical care? Can I grow a bonsai tree from ...
0
votes
0answers
24 views

Query individuals with both WGS and RNA-Seq data

Using the SRAdb R package, I am looking to query individuals who possess both WGS and RNA-Seq data on the SRA. So far I believe I have been able to query specific samples with both WGS and RNA-Seq ...
3
votes
0answers
33 views

Scaling down amount of DNA for transfection: what factor to consider?

I am interested in transfecting HEK293 cells with a BAC. One paper suggests using 24 ug of DNA to transfect a 55-cm^2/10 ml culture plate. I am using an assay optimimzed for a 96 well plate so I am ...
0
votes
1answer
59 views

what is the formula to establish ec50 reproducibility with respect to dose response curves for some drug

The EC50 is determined by fitting a standard curve to the experimentally obtained control values for each dose response curve using some software that does trial and comparison until satisfactory(...
0
votes
0answers
31 views

Problems with housekeeping genes

I have tried several housekeeping genes to analise the relative expresion of a cytokine for measure the inflamatory local response in mice ears, all the housekeeping genes I have tried are not stable (...
-2
votes
1answer
37 views

Does tRNA contain parts with double-helix structure? [closed]

I read in some place that tRNA has a part which is double-stranded. I wanted to know if that part is similar to DNA (double-helix). (And I know that tRNA won't contain Thymine)
-1
votes
0answers
36 views

Why does female's age of puberty inform on mating system?

Reading from Does increased calorie intake cause increase in libido in humans?, @AlexStone says: I'm aware that humans have a dual mating strategy - somewhere between pair bond and casual mating. ...
1
vote
1answer
18 views

Are fish averse to extreme heat?

Terrestrial animals face two common sources of heat extreme enough to pose a danger to them: Sunlight and fire. It therefore stands to reason that they would evolve systems for sensing heat and ...
12
votes
3answers
183 views

Is the amount of the soil reduced when plants grow?

According to the principle of mass conservation I think the amount of the soil should be reduced when plants grow. But this reduction is not observable so much. For example, some trees (big trees) ...
5
votes
1answer
46 views

How is a synapse held in place?

Here is a question I've never asked myself until now: All textbooks show synapses with a decently large synaptic cleft between the axon terminal and the dendrite. How is this connection held in place ...
3
votes
0answers
23 views

Does increased calorie intake cause increase in libido in humans?

I'm interested in the effect of increased calorie intake on sex hormones and chosen mating strategy in humans. I'm aware that humans have a dual mating strategy - somewhere between pair bond and ...
3
votes
3answers
52 views

Can pathogens enter the bloodstream if the epidermis has been scraped off?

Assume that the epidermis has been scraped off by a fall (not just scratched). Also assume that the dermis is completely untouched. Does this allow pathogens to enter the body more easily, or does the ...
1
vote
0answers
9 views

Link between hypoglycemic events in Type 1 diabetics and clinical anxiety?

I recognize that the scientific community is aware that the chemical stress pathway is mediated by glucocorticoids. The pathway response initializes as a result of some sort of stress (potentially ...
3
votes
0answers
44 views

Tree ID request

We have a small tree (more like a shrub) in our village of north eastern anatolia, and it is known for its local name which is not Turkish. Even worse I don't know which language it is, but most ...
1
vote
1answer
32 views

Can you knockout a gene specifically in the dorsal root ganglion in adult mammals?

Since the dorsal root ganglion is so small, would that be easier than the entire body?
3
votes
1answer
24 views

How do drugs enter synapses?

Many psychopharmaceutical drugs change synapse chemistry or directly agonize neuroreceptors in the brain. For example, cabergoline is a D2 agonist. How do these compounds enter the physical synapses? ...
3
votes
1answer
39 views

What is heteroduplex?

I fail to understand the what exactly is heteroduplex due to unavailability of a suitable diagram. According to wikipidea: A heteroduplex is a double-stranded (duplex) molecule of nucleic acid ...
0
votes
0answers
15 views

Is every evolutionary change an improvement? [duplicate]

In evolution, an species mutates and evolves over large genetic time spans. But every big change (say, swimming to walking, or walking to flying) is made up of countless micro-changes over the course ...
1
vote
1answer
32 views

Is it possible to have a random un-mutation of genes?

According to this article: Gene mutations can be classified in two major ways: Hereditary mutations are inherited from a parent and are present throughout a person’s life in virtually ...
1
vote
0answers
16 views

Does class switching occur both in B cells and Plasma cells?

I understand that the cell class switches to change the type of immunoglobulin it is producing. The B-cell produces the membrane bound B-cell receptor (BCR) while the plasma cell produces the the ...
-1
votes
1answer
33 views

What legal possibilities exist to get access to articles behind paywalls? [closed]

Many publications, be it in high-profile journals, proceedings, book chapters or any other medium, cannot be accessed without subscription alongside substantial costs, even though most of the ...
0
votes
0answers
10 views

is the red eye reduction lamp dangerous to an infants eyes? [closed]

is the red eye reduction lamp dangerous to eyes? I have a friend who is concerned about us taking so many pictures of her 3 month old.
0
votes
0answers
43 views

Why is the protein ubiquitin so ubiquitous?

Ubiquitin is a protein tag that is attached to proteins in order to mark them for destruction/proteolysis by the cell. This system is sometimes used for clearing out harmful viral proteins that infect ...
0
votes
0answers
9 views

How does the Jendrassik's manoeuvre reinforce reflexes? [migrated]

According to Wikipedia, The Jendrassik maneuver is a medical maneuver wherein the patient clenches the teeth, flexes both sets of fingers into a hook-like form and interlocks those sets of ...
0
votes
1answer
26 views

Is it safe to feed an adult fire salamander with slime maggots? [closed]

As a reminder, maggots feed of a flesh, while fire salamander consumes his prey alive, without killing it. Can it happen that the maggot will start eating the salamander from the inside?
3
votes
2answers
46 views

Does an increased reproduction/mortality rate provide an evolutionary advantage?

If a species has a high mortality/birth rate, then it is able to adapt to changing environments more quickly than species that live for a long time. Without a high mortality rate, food and other ...
0
votes
2answers
45 views

Why cancer disease is named after sun signs ? [duplicate]

I googled it, It didn't helped me a lot. So Why cancer disease is named after sun signs ?
3
votes
2answers
45 views

Is this in vivo or ex vivo?

This question has probably been asked a few times but I get the concept I just dont know how to apply it for this paticular experiment I aim to use cherry tomatoes and determine its glutamate content ...
0
votes
0answers
9 views

How long can/will an infant hold his/her breath as part of the dive reflex?

Various other questions on the site have talked about the Diving Reflex, which is also known as the Mammalian Diving Reflex. This reflex is observed in mammals of various species, but also in human ...
3
votes
1answer
77 views

How Much DNA do Siblings whose Parents are First Cousins Share?

On average, two siblings generally share 50% of their genome. How much does this increase if the siblings' parents are first cousins?

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