7
votes
1answer
88 views

Can a Turner syndrome patient develop male characteristics artificially?

From an answer to the question Can stem cells from male convert to cells of female-only organs, and vice versa? Y chromosome is the sex determining chromosome with SRY gene that determines testes ...
0
votes
0answers
53 views

Disposable Soma Theory and the case of the contraposition

According to August Weismann (1889), Kirkwood and Holliday (1979): Because of the evolution of an organism that is segregated into soma and germ cells, soma becomes disposable, and in the face of ...
4
votes
2answers
44 views

Books about famous experiments in biology - 'methods of investigation'

I'll explain briefly what I need (hoping to find something) : I wanted to know if someone knew about a book that in a way or another talked about the greatest experiments in biology (Griffith, ...
-1
votes
0answers
23 views

Bubble Boy syndrome [duplicate]

I know that under normal circumstances, immunosuppressors are needed to mitigate the host body's immune reaction to the graft. However, people suffering Bubble Boy Syndrome have pretty much no immune ...
3
votes
1answer
36 views

How does an octopus eye react in free fall?

according to Wikipedia: Attached to the brain are two special organs, called statocysts, that allow the octopus to sense the orientation of its body relative to horizontal. An autonomic response ...
0
votes
1answer
20 views

Thyroid hormone metabolism and excretion

My understanding is that hormones generated by the thyroid gland, including, for example, T4, are excreted and recirculated in the body through the digestive tract. The reason for thinking this is ...
-2
votes
1answer
36 views

what is the difference and similarities between Antidote and Antibody?

I know that antibody is destroy Antigen and antidote is reverse of antigen.So,What are the similarities and difference between Antigen and Antidote? Are they same?
1
vote
0answers
25 views

Mendelian genetics - How can we infer the number of genes in play in this scenario?

So this is a practice question I got from school but I kinda lost here. So the question is: In Drosophila , four new recessive mutations have been found all of which produce purple eye ...
0
votes
0answers
22 views

How some Epigenetics characters can potentially be passed down through the generations

The (sperm +ovum)zygote is totipotent stell cell means all genes of the zygote's DNA are "on"state that can be switched off by differentiation process converting specific cells with different Jobs.So ...
0
votes
2answers
71 views

What is this animal? [duplicate]

Can someone tell me what is the name of this one? Then I can check a little more about it.
4
votes
1answer
72 views

Can you identify this animal?

It was in the bathroom, 2cm in lenght (or so). It has two small antenas on the head. I live on Balkan peninsula, inland.
0
votes
1answer
40 views

What is this little white creature?

Please identify this little and soft white creature. Since childhood I am seeing this things flying in my surroundings and nowadays they are seen occasionally.
1
vote
0answers
29 views

From an information perspective, are both strands of DNA necessary?

I am learning about the genetic code, replication, and transcription, and I have a question about whether or not both strands of DNA are really "necessary". In replication, at a high level, we are ...
-1
votes
1answer
39 views

Why does cold kill humans but not bacteria? [closed]

Bacteria can continue like nothing happened after being exposed to low temperatures why doesn't this happen to humans as well? Why can't our metabolic machinery continue as normal?
2
votes
1answer
42 views

What happens when the parietal cells of gut epithelium becomes partially non-functional?

The options are a) The pancreatic enzymes will not work properly b) The pH of the stomach will fall abruptly c) Steapsin will be more effective d) Proteins will not be adequately hydrolysed by ...
2
votes
1answer
828 views

Which Papaya (Lechosa) plant (male or female) bears fruit?

I will be planting Papaya fruit seeds and I understand that there is a female and a male plant, so how can one distinguish which are the ones that will bear fruit and which I should just rip up by its ...
4
votes
1answer
454 views

Why is DNA double stranded and RNA single stranded? [closed]

Why is DNA present as a double helix structure and RNA as a single helix? What causes the difference between them? What are the practical physiological differences between dsDNA and ssRNA? How are the ...
14
votes
1answer
13k views

What is the female equivalent of the morning erection that some men experience?

There was question about what causes "morning wood." It was answered that the erection in the morning is caused by decline of norepinephrine during REM sleep. Which in part allows to prevent ...
3
votes
3answers
273 views

How long could Earth's oxygen supply last if no new oxygen were produced? [closed]

I read in an article or heard in some documentary that there's so much oxygen in the atmosphere that even if all photosynthesis stopped, there's already enough to last us a long time. Is this ...
11
votes
1answer
250 views

What biological functions does crying serve?

Tears suddenly start flowing out of our eyes when we find our long lost friend or when someone unexpectedly decides to break up with us. Do tears really save us from harm? Or are they just the reflex ...
3
votes
1answer
22 views

What does it mean for muscles origins and insertions to be the other way around in the right than left limb?

Herbert Srebnik writes in Concepts in Anatomy: In the right limb, the muscle's origin is proximal to the joint and the insertion is distal to it. In the left limb, the muscle's origin is ...
0
votes
0answers
13 views

Does time in the perception of little creatures move faster or slower?

Little creatures, like flies, do also, like us humans, perceive time. But do events surrounding them move faster or slower?
4
votes
0answers
29 views

How much do urban pigeons move around cities?

Do they tend to live their lives in one area of the city or do they move around? For example, do pigeons born on London's Trafalgar Square live their whole lives centered around Trafalgar Square or ...
0
votes
0answers
15 views

Can overhydration cause a drop in hemoglobin?

I am trying to understand the mechanism by which overhydration affects hemoglobin and oxygen intake. Does the water first depletes the buffers such as ferritin storages? What about haematocrits? In ...
10
votes
2answers
283 views

Why do we have two of some organs, but not all?

We have two eyes, but we don't have two hearts. Why do humans have two of some organs, but not all?
1
vote
1answer
42 views

What are the characteristics of a living organism? [closed]

It seemed fairly basic at first, and yet I have to ask because even a quick Google search reveals that it doesn't seem to be quite so straight-forward anymore. After more research, I found multiple ...
4
votes
1answer
77 views

Identification of a small mammal

Could someone help with identification of this small mammal? Is it a possum? A dormouse? It was photographed in Sukhumi botanical garden, in Abkhazia (west of Georgia, on the shores of the black ...
3
votes
2answers
213 views

Why are sponges sometimes not considered multicellular?

I read somewhere (I can't find where) that there is no scientific consensus whether sponges should be considered multicellular organisms. It seems I don't understand where is the line between ...
0
votes
1answer
25 views

Can ncRNA convert to coding RNA/mRNA by mutations?

DNA has transcribed into RNA (Non-coding). Can this RNA mutate and become a Protein-Coding one/mRNA? Have there been any such instances reported by scientists?
2
votes
2answers
49 views

Server for protein structure prediction for multiple sequences

Does anybody have any idea about any online server that takes in multiple amino acid sequences in fasta format and outputs the 3D structure of the input amino acid sequences in the form of helix, ...
1
vote
0answers
15 views

Measuring, using and analyzing skin resistance in kohms

What are ballpark ranges of skin resistance in Kohms for average men and their significance (for example 500-1000s = stressed vs 1000+ = fairly relaxed) What do various skin resistances in kohms say ...
-1
votes
1answer
48 views

Evolution & Celluar Chemistry [on hold]

I'm new to this site but had a question on evolution, apologies if some of these questions seem basic but they are from a book i am reading challenging the role of chance in evolution. Taking the ...
0
votes
0answers
20 views

Are immunosuppressors necessary after a bone marrow transplant for Bubble Boy Syndrome?

I know that under normal circumstances, immunosuppressors are needed to mitigate the host body's immune reaction to the graft. However, people suffering Bubble Boy Syndrome have pretty much no immune ...
4
votes
0answers
68 views

Does Cas9 require a nuclear localization signal (NLS) for it to work in a Eukaryote?

I'm trying to establish if it's required to add a NLS to Cas9 when expressed (or transfected) in a Eukaryotic cell. Several papers report using a viral NLS, but is it absolutely necessary? Could ...
5
votes
1answer
65 views

Electrophoresis of hemoglobin from a carrier for sickle cell anemia shows two bands - why not three?

Electrophoresis of hemoglobin from a carrier for sickle cell anemia shows two bands - why not three? Since there are two beta chains in each hemoglobin, it seems to me they should have three types of ...
4
votes
1answer
126 views

What is the impact of stress on the human body?

Can stress trigger any changes in the human body? I'd like to know more about things less commonly known than, for example: sweating and tiredness. What are the long term risks of chronic stress? Do ...
6
votes
2answers
564 views

Does breath-holding cause permanent brain damage?

My question is: Does voluntarily holding your breath at atmospheric pressure for a few minutes can cause brain damage? I'm talking about periods of time around 3 minutes. I've read there are some ...
4
votes
2answers
29 views

How do I know whether or not a nuclear gene is single copy?

As a part of a phylogenetic study, I need to find a nuclear gene that meets the following requirements: Single copy gene; Highly variable gene; Gene longer than 400 bps; Gene that gives information ...
3
votes
1answer
57 views

What is a “monomeric polypeptide”?

In the sentence: "Bacteriophage (viral) polymerases are typically monomeric polypeptides". I know that polypeptides are chains of amino acids monomers. But what is a "monomeric polypeptide" and what ...
0
votes
1answer
18 views

How can you develop a bacterial infection when taking antibiotics for another area of the body with a bacterial infection? [closed]

How can you develop a bacterial infection when taking antibiotics for another area? For example, "if someone was prescribed an antibiotic for a bacterial infection of the throat and while taking the ...
0
votes
1answer
51 views

How do I tell if the mosquitos in my New York City apartment can carry Zika?

The species that carries Zika, A. aegypti, is unlikely to be found in New York. However, the related species A. albopictus is prevalent and quite concerning. So this question is focusing on A. ...
0
votes
1answer
42 views

Xylem Properties

In a biology lecture, I was told that the xylem vessels were 'narrow so that the water column does not break easily and capillary action can be effective'. My question is why is this? Is the ...
4
votes
1answer
59 views

A 10mm long creature in the California dust

I observed this tiny creature burrowing through the dusty soil of Cachuma Lake Recreation Area in Santa Barbara County, California, on June 8, 2014, about 7 a.m. I have really no clue what it could ...
3
votes
1answer
29 views

Any idea what this red plant is?

I live in South central Indiana, US, and these have just started appearing in the grass in my yard. I just bought this house last fall so I've never seen them. Anyone know what they are? Are they ...
1
vote
2answers
52 views

Recessive is Dominant to Dominant?

If a gene has for instance three alleles, p, q, and r, then could p be dominant to q, q be dominant to r, but r be dominant to p? Can a gene that is recessive to one allele not be dominant to another ...
1
vote
1answer
79 views

Which part of the reflex arc takes the longest time?

If the reflex arc is composed of 4 parts: Activation of sensory receptors, Conduction to and from the CNS, Transmission across the neuromuscular junction & Activation of the muscular contractile ...
0
votes
0answers
14 views

Ewens-Watterson Test of Neutrality

The Ewens-Watterson test is one of the first test of neutrality (of no selection). Later came tests such as Tajima's D or Fu, Li's G and many other. Question Can you please make a description of how ...
1
vote
0answers
26 views

Why would worker bias sex-ratio toward workers?

This question prompts for explanation on a topic, an interpretation of this topic is given. A simplified question statement is also given at the end for those who do not wish to read. Topic In the ...
0
votes
0answers
12 views

Modeling a patient's parameters (SPO2, HR, BIS etc.) to their effect on the patient

I'm currently using code (C#) I wrote which creates a 3 compartment model to simulate the concentration $C_{p}$ of Propofol in blood plasma using the Schnider and Marsh pharmacokinetic models. I ...
0
votes
1answer
39 views

How does epigenetics know to mutate which gene in order to survive? [closed]

It seems that during reproduction particular genes are targeted for modification (mutation, deletion, insertion, etc.) given environmental inputs of either or both of the parents. If a creature was ...

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