1
vote
0answers
13 views

Martian Abiogenesis?

In the Miller-Urey experiment the probability of the chemical origin of life under (hypothetical) early Earth atmospheric conditions were assessed. For that water, methane, ammonia, and hydrogen were ...
0
votes
2answers
45 views

How did scientists establish the reactions that occur in metabolism? [closed]

How did scientists establish that macromolecules like proteins, carbohydrates and lipids are synthesized from other molecules with intermediate products by living cells. Did they observe this under ...
-1
votes
1answer
25 views

Product of reaction between HCl and bile [closed]

In the mammalian digestive system HCl is the main acid and bile is the main alkali. What is the product of the reaction between these two chemicals?
0
votes
0answers
19 views

How is signalling disturbed in trophoblastic cancer cells?

Trophoblastic cancer seems to be a form of growth that no longer responds to the neural signals which try to inhibit them. Can someone please explain whether experiments have been performed as to how ...
6
votes
2answers
73 views

RNA processing in eukaryotes

Why does post-transcriptional processing of eukaryotic mRNA involve addition of a 3' polyA tail, rather than one of polyU, -G, or -C?
3
votes
1answer
35 views

Crossing over : Holliday model

In this figure out of the two heteroduplexes formed one is considered to be non-recombinant product(left) and the other recombinant product(right). My question is despite the exchange of middle DNA ...
0
votes
0answers
9 views

Strategy for tree and shrub identification

I often find it difficult to identify trees and shrubs even though I have many handbooks and manuals on trees and shrubs in my area (New England). The typical problem is that the species is not in the ...
0
votes
1answer
14 views

Catalytic Triad of Serine Proteases

Is serine considered an acid in the catalytic triad involved in the mechanism of action of serine proteases? It is donating a proton to His but I am not sure if this really qualifies as an acid?
1
vote
0answers
17 views

Robertsonian translocation on the same chromosome

is there any big difference between Robert-son-i-an translocation between two 13 chromosomes comparing to a translocation between 13 and 14 chromosomes
-1
votes
0answers
45 views

Is there an evolutionary purpose for postpartum depression in human females? [closed]

Essentially what the title says...It seems odd that at the very stage in which new life is supposed to be protected, we see new mothers at a higher risk for particular kinds of mental illness (...
3
votes
2answers
66 views

Codon tables and the wobble hypothesis

In E. coli, there are only 47 different tRNAs but 61 potential anticodons. This is because, from what I understand, the third base of the anticodon can pair by wobble rules. However, it is known that ...
0
votes
0answers
15 views

How can I measure the curvature of bird's beak on the field?

I'm wondering if there is a standard tool to measure the bird's beak curvature. It seems that a spherometer wouldn't work because the beaks that I'm measuring are not circular but more parabolic. ...
0
votes
1answer
19 views

What is the name of the groove down the middle of an anther?

I thought it had a name along the lines of interlocular groove, but I haven't been able to find that term anywhere.
0
votes
0answers
12 views

What is the acceleration profile of the grey hound?

I'm interested in the acceleration curve over time that's typical of an adult grey hound prior to attaining this peak velocity. My curiosity is motivated by a desire to better understand the data ...
3
votes
4answers
66 views

How do I effectively visualize data showing change in a lot of samples over two time periods? [closed]

I've tallied the number of glands in a plant this year and last year. My full data set has about 20 plants in it (I've reproduced the data from 10 of the plants here). I want to show that the plants ...
0
votes
1answer
21 views

What is the acceleration profile of a cheetah?

I'm interested in the time it takes for a cheetah to reach maximum velocity as well as the acceleration over time that's typical of a cheetah prior to attaining this peak velocity.
3
votes
1answer
22 views

What does “cell type composition” mean?

I am reading an article about detection of differential methylation. They use the term "cell type composition" in the following context: "Researchers need to carefully design studies that associate ...
3
votes
1answer
51 views

What are the exceptions of Mendel's laws?

What are the exceptions of $-$ Law of dominance Law of independent assortment Law of segregation My knowledge: Exception of law of dominance: Incomplete dominance: Unlike dominance in ...
0
votes
0answers
9 views

Why Streptococcus bacterias don't separate completely?

Why Streptococcus bacterias don't separate completely from each other? Is there any connection with this phenomenon and Fts proteins and related mechanism in cell devision?
-1
votes
2answers
28 views

Good microscope? [duplicate]

Hi I am a teenager and I recently studied biology and found it very interesting. I want to get a microscope and study further into the microscopic world. What would be the best microscope for me? I ...
2
votes
1answer
31 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
21 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
24 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
32 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
18 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
36 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
60 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
32 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
37 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
187 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 ...

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