1
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0answers
6 views

USABO 2013 Open Exam Question 45

I came across this question in USABO 2013 open exam: A mother antelope and its child are galloping along the plains, when they encounter a group of hungry lions. If the two antelopes try to escape ...
0
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0answers
2 views

Are there any nerves in the sympathetic nervous system that, if pressed on, will turn on the flight or fight response?

I am trying to understand the ways the sympathetic nervous system flight or fight response gets activated. Are there any nerves in the sympathetic nervous system that, if pressed on, will turn on ...
-1
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0answers
6 views

How do growth factors in biology work? What is the process or steps involved?

How do growth factors work? What is the process or steps involved?
1
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0answers
11 views

Why do some drugs require you to take them in an “upright position”?

A friend of mine was taking the supplement Metamucil and on the container it says to take in an "upright position." Why would this be necessary? Doesn't your digestive system push food/liquid ...
0
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0answers
4 views

Why BLAST reduces word size of short proteins?

I'm using BLAST to identify a short protein (BLASTp). If I check the short query then the word size reduces from 3 to 2. However the search will then be less ...
1
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0answers
10 views

experimental procedure regarding AceCS1 overexpression

I'm new to biology and was just as to curious on how one can experimentally prove/disprove that AceCS1 overexpression in mammalian cells would yield enhanced rates of fatty acid synthesis through ...
1
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0answers
8 views

Where could I publish a NMR/MD simulations hybrid Method paper?

Do you have any recommendation for publishing methods ? An NMR method journal would be the best, but I am open to suggestion. I do not read a lot of method papers so I am not really sure where I ...
0
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1answer
23 views

Photosynthesis and it's subtopics

Which of the following statements about photosynthesis is true? a. Photosynthesis is an energy consuming process b. The light-dependent reactions produce the energy-rich compounds that are used up ...
0
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0answers
10 views

What are E. Coli adaptive mutations good for?

Am I getting it right, that the SOS answer including making errors in DNA-polymerase reading is supposed to create mutations of "hunger" (fewer sources conditions) resistance?
1
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1answer
20 views

Doubt in a multiple choice question involving cell organelles

Find the odd one out and state the category of the rest. Chloroplast Mitochondria Nucleus Grana Now my answers are : 1st possibility : grana Category : presence of DNA in ...
0
votes
0answers
19 views

What is the molecular mechanism behind oncotic pressure? [on hold]

Reposted from chemistry stackexchange as I received no answers: I can't wrap my head around the idea of oncotic pressure and osmolarity, logically. I imagine a blood vessel. It is FILLED with ...
0
votes
0answers
15 views

What role do wasps play in our backyards and what is their importance to the ecosystem?

Summer is coming soon to the northern hemisphere and with it come wasps. I do somewhat understand why some people do not like these insects, and think we should get rid of them, but I think they ...
1
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0answers
20 views

Is it comfirmed that Alzheimer's is a diabetes of the brain?

I read in this New Scientist report, that diabetes might cause Alzheimer's. The hypothesis was based on a study with 20 rats. Has there been any follow up research? Is Alzheimer's such a slow ...
1
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0answers
13 views

Could random male-only-offspring mutation wipe out a species?

If we can think of wiping out a whole species of mosquitos with male-only-offspring genetic mutation how come has this not happened naturally in the past to many species? Or has it?
2
votes
0answers
9 views

Why does our eyes see red when exposed to to much light?

When I looked into my projector when it was on the blue screen it left a red spot in my vision. I should not have tried it but all the colors left a red spot. Why not a blue or yellow spot was left?
1
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0answers
11 views

Living on pure glycogen?

I was recently fascinated when I learned about polysaccharides (I am a biology newbie) and was wondering about some of their properties. After doing some googling I was unable to find any information ...
1
vote
1answer
33 views

How do cancers eventually lead to death / other debilitating symptoms?

With regards to people I know or have read about who live with cancer, most of their symptoms are results of chemotherapy, surgical interventions, etc., which have the goal of eradicating the cancer. ...
1
vote
2answers
16 views

Microscopy of moving white blood cells

Is there a way to get white blood cells to move while on a microscope slide? I want to try to get some microscope images of them moving, but so far I have only found them stationary.
2
votes
1answer
30 views

Is cell wall and cytoplasm an organelle?

So cell wall is an organelle? Whereas, it is not a membrane-closed organelle? Cytoplasm is an organelle? Whereas, it is not a membrane-closed organelle?
0
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1answer
18 views

Without plant breeding and domestication, would most of the foods consumed by humans evolve to become inedible?

Would this happen? Do species evolve to avoid being consumed, especially the animal species which have no need to leave seeds?
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0answers
15 views

Blushing, stress, red face

N. sympathicus causes vasoconstriction. How is it then possible, that people under stress turn red, rather than pale (in their face)? Redness is normally the symptom of vasodilatation.
1
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0answers
23 views

How to retrieve logical expression (KO based) for reactions from KEGG?

Whether a module is complete or not can easily be checked by evaluating the Definition entry associated with the module; e.g. in module M00010, it is given by ...
0
votes
1answer
20 views

How does an increase in CO2 concentration affect Photosynthesis and Transpiration

I noticed a strange thing in my book. At one place it says that an increase in CO$_2$ concentration in the outside air decreases the rate of transpiration but at the other place it says that an ...
-4
votes
0answers
34 views

Wilting of plants at night?

I have seen that certain plants wilt at night as well! But its quite normal temperature and i tried to figure out the biological reason but in vain . I know that why they wilt during the day since I ...
0
votes
0answers
9 views

What drives male fish to spray their milt?

In mammals the sexdrive of the males is because the intercourse provides a satisfaction where after, the sperm is ejaculated into the female. However, the male sperm doesn't enter the female fish but ...
0
votes
0answers
10 views

Metal and epilepsy [on hold]

How does metal rods or keys help a person in epilepsy? A person with fits is generally given a metal when he is attacked by epilepsy. How does the mechanism work?
3
votes
0answers
26 views

How is a T lymphocyte specific to an antigen but not specific to an epitope?

In my immunology notes, it states that B lymphocytes (and other APCs) capture and present antigens to T lymphocytes that is specific for an antigen, but that the T cells do not necessarily recognise ...
0
votes
1answer
19 views

Resting stage of primary oocytes

In my biology textbook, I read that the primary oocyte gets arrested in the early stages of meiosis in prophase I (diplotene stage). I wanted to know why this is so. I searched google, and this ...
0
votes
0answers
11 views

Similarity between lncRNA and Enhancers

Please read it carefully. Question below is purely based on computational experiments: I have been running an analysis algorithm (pretty new one) on lncRNAs and its showing pretty much the same ...
1
vote
1answer
16 views

Minimal viable EEG equipment for dissertation research on BCI / BMI

I am planning out a dissertation study of Brain-computer Interface (a.k.a. Brain-machine Interface, BCI, BMI, etc) applications. One of the 3 papers in that dissertation will involve collecting ...
0
votes
2answers
17 views

What is the genetic difference between two cone branches?

As we can see on this larch, male and female cones are sometimes directed to grow on the opposite side of the branch. We were told in school that this mechanism works against self-fertilization. Also ...
1
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0answers
11 views

What is the exact percentage of spectral changes that human pinnae introduces into the acoustic input signal?

I read somewhere that amount of spectral changes that human auricula introduces into the input signal is 6%. Now I cannot find that literature. Does anyone know a source that might confirm this, or ...
0
votes
0answers
15 views

What do recessive/dominant alleles actually mean in terms of modern genomics? [duplicate]

In Mendelian genetics, we discuss phenotypes, which are specified by the alternative versions of genes called alleles. In terms of peas, the phenotype "round pea" encoded by one allele of a gene is ...
0
votes
1answer
23 views

short-day facultative plant, abrupt change to photo period

What happens biologically to a short-day facultative plant that is a few weeks into its short day (flowering) photo period and is suddenly given a 24 hour period of light? Does anything change ...
1
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0answers
14 views

Bug ID. Infestation in Pennsylvania

Several of these crawling on the walls. Length ~3-4 mm. Some (adults?) are larger and darker colored.
1
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1answer
36 views

Lifetime of secondary messengers such as Calcium or IP3

Can anyone suggest me literature on the lifetime of secondary messengers such as calcium or IP3? A book would be preferred. What I am specifically looking for is a validation that secondary messengers ...
1
vote
0answers
19 views

Where do plants obtain the metal ions needed for biological processes?

Enzymes employ metal ions (e.g. Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn) for catalysing certain reactions. Let's consider planting a seed. Where will it obtain these metal ions from? Just from water?
4
votes
2answers
25 views

Larvae Identification

Can you help identify this worm? It was found in a cup of water at a restaurant (unpleasant, yes), likely came through the water system. (Location: Texas) Found these images of it online (in which ...
2
votes
1answer
31 views

If crocodiles are k-selected, why do they supposedly “not age,” as in avoid senescence?

I recently saw a few sources stating that Crocodiles do not biologically age, implying negligible senescence. Basically, a 70 year old crocodile is in the same physical/health condition as a 7 year ...
4
votes
0answers
29 views

The Perplexing Trilobite: What is the Evidence Supporting The Hypothesis That They are Not Crustaceans?

In the field of paleontology, one question that's really bugged me (er, no pun intended) of late is why the subphylum/class Trilobitomorpha/Trilobita is off on its own branch of the Arthropoda phylum, ...
0
votes
1answer
11 views

Mesoderm vs Mesenchyme- what's the difference?

My embryology textbook states that mesoderm can exist as Mesenchyme or Epithelium. I'm not sure what 'epithelium' means. Here is a quote for context: Somatic, splanchnic, and somite mesoderm can ...
0
votes
0answers
10 views

Fine permanent fluorescent marker for blue light

I am looking for a fine- (or small-)tipped permanent marker to write on Petri dishes that is visible under a blue light or a transilluminator. It would seem obvious, but it is a nuisance. The ...
2
votes
0answers
30 views

Can we modify plasmids to eliminate antibiotic resistance?

This is a very general question regarding the potential use of artificially modified plasmids to block or modify bacterial evolution in order to prevent development of anti-biotic resistance. For ...
2
votes
1answer
24 views

What are tail currents?

This is a voltage clamp on an ion channel. When the voltage is stopped there is a still a current at the end (the tail current). I understand that the gates aren't completely closed because of which ...
0
votes
1answer
46 views

Current state of Gene Therapy [on hold]

I am interested in learning about attempts to treat adult individuals suffering from a genetic disease in which the underlying changes in the DNA of the gene are understood. (i) Are there approaches ...
-3
votes
0answers
44 views

ants and their super powers [on hold]

I've noticed lots of ants being inside a package with sugar confectionery decorations. How did they get into a completely healthy package ? (P.M they ate its colors, what is left is some boring ...
0
votes
0answers
12 views

How can you tell if there is local adaptation? Non-genetics Methods review

Background Local Adaptation is a famous subject of interest in ecology and evolution. Among ecologists, it is not rare to try to find evidence of local adaptation in absence of genetic data. As a ...
0
votes
0answers
16 views

What happens when mammalian ovum fails to get fertilized? [on hold]

If mammalian ovum fails to get fertilized , which of the following is unlikely ? a) corpus leuteum will disintegrate b) estrogen secretion further decreases c) primary follicles starts developing d) ...
0
votes
1answer
29 views

How to isolate two plasmids from E. Coli strand?

I have an E. coli cell line I use to express a protein using a two plasmid system. One confers AmpR and one KanR. For mutagenesis I would like to separate the plasmids to increase efficiency of the ...
0
votes
1answer
82 views

Is evolution a predictive theory? [on hold]

My feeling is that almost any observation can be explained by current evolutionary theory. Is there any example of someone developing a rigorous framework or mathematical model of how evolution works? ...

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