2
votes
0answers
39 views

Vitamin and mineral contents of common fruits

I'm looking for nutritional data, mostly vitamin and mineral contents of common fruits, such as apples, bananas, oranges, kiwis etc. Are there scientific (published and peer-reviewed) sources that ...
3
votes
2answers
121 views

High sequence similarity but start codon isn't methionine

I have noticed in a particular genome sequence of a prokaryote that various regions in a sequence share similarity which is high(>80%) with known proteins. However, the start is not a methionine. Is ...
10
votes
1answer
152 views

Does sleep in humans re-structure based on the expected sleep time?

I've read about anecdotal evidence that human brain has a fairly good internal clock that can be used to judge the amount of time that has passed. I'm wandering if there are any mechanisms in the ...
1
vote
1answer
151 views

Are there any viruses or bacteria which have evolved to withstand higher temperatures due to fever

My question was raised after receiving this information: The primary reason the body raises its temperature (via the Hypothalamus in this case) is that bacteria and viruses tend to optimally ...
2
votes
1answer
61 views

Indestructible Super Shrimp

How are shrimp and other animals able to not be crushed by the 1000x greater pressure at the bottom on the Mariana trench? Wiki says the trench is home to "large living creatures such as a sole or ...
1
vote
2answers
614 views

How do animals decide what to eat and what not?

I want to know this in particular about animals that no longer eat what they used to eat. The best example in my opinion are chickens. Chickens are often held to eat all kinds of food we would ...
1
vote
0answers
97 views

Why aren't antheridia and archegonia touching?

Antheridia and archegonia are the two male and female gametangia, respectively, and they are found in bryophytes. To cause fertilization, usually a thin film of water must be present for the sperm ...
1
vote
0answers
34 views

If a receptor is inhibited throughout embryogenesis, could there be observable phenotypic differences in the adult?

So I read a journal article entitled "Maternal hypoxia and caffeine exposure depress fetal CV function during primary organogenesis" (Momoi, et al., 2012) and in essence the article speaks of the ...
5
votes
1answer
494 views

If fever is a natural immune defense, why do people take drugs to lower it?

If fever is a natural defense against pathogens, why do sick people take NSAIDs to reduce the fever?
-3
votes
1answer
116 views

How much can be said about behaviour (future) based on bloodgroup?

My bloodgroup for example is A+. How much information is knowing my bloodgroup? How much information can be known from a blood sample? I expect you to be able to clone if known a complete DNA sequence ...
3
votes
0answers
59 views

Sequencing rtPCR product

So I have a validated set of primers for rtPCR from Biorad that contains SYBR green. If I do rtPCR, can I use the rtPCR product after purifying it with a Qiagen PCR purification kit? Also, I'm under ...
2
votes
0answers
60 views

Might a previously administered MPSV4 vaccine react with a newly administered MCV-4 vaccine?

This is a hypothetical situation. Meningococcal polysaccharide vaccine (MPSV4) is a vaccine against Neisseria meningitidis. MCV4 is a conjugate vaccine. I would like to know if the polysaccharide ...
5
votes
1answer
97 views

Can cirrhosis be caused by physical compression of the body?

On a random forum, a member speculated that their cirrhosis was caused by wearing tight-fitting clothing such as a girdle or corset. This leads me to the following question: Question: Can ...
6
votes
1answer
230 views

How selfish is Dictyostelium slug formation?

Dictyostelium is a slime mold which is well known for having a single cell free living phase and other some conditions (e.g. when food is scarce) for forming communal piles of cells called 'slugs' ...
7
votes
2answers
222 views

Does becoming martyr have an evolutionary advantage?

This is related to How does "be altruist to those who are similar to you" evolve? Altruism that is Not reciprocal Not familiar has little explanation. One possible explanation is that ...
6
votes
3answers
661 views

How exactly are game theoretical evolutionary models described during implementation for computer simulations?

When a biologist or a layman tries to reason the evolutionary explanation for something, they would simply use English with some math thrown in (for a random example, pick any explanation out of "The ...
1
vote
1answer
58 views

Is there an animal which, when eaten by other animal, poisons the predator and gets out of it's stomach?

It was a question in one competition, but it remained unanswered and i am curious about an answer. There was a hint: American bullfrog but i can not find any example of this behaviour on the web.
1
vote
0answers
84 views

Cereal Alpha and Beta Amylase temperature range and reaction rate

This question is motivated by a practical application in bread making. While it is well known which are the optimal (highest reaction rate) temperatures for both alpha and beta amylase, I am not able ...
1
vote
1answer
135 views

What part of the cactus photosynthesizes?

In general, plants photosynthesize through their leaves and, to a much lesser extent, through their stems. Cacti, however, have no visible leaves, but instead spines. In what part of the cactus does ...
2
votes
1answer
2k views

Speciation by polyploidy

Speciation can occur by polyploidy. My understanding of the process is as follows: 'polyploidy is when the number of chromosomes in an organism's cell doubles. This means that the organism has more ...
1
vote
2answers
562 views

Batch convert miRNA names to Accession IDs?

Does anyone know of tools to convert lists of miR names to their miRBase Accession IDs? I know they exist, but my search keeps pulling up gene ID converters. EDIT: both @rg255 and @shigeta have ...
0
votes
0answers
139 views

Growth kinetics of E.coli on media containing lactose and casein

I did this experiment last month using E.coli isolated from raw milk and have following data via uv-spec: ...
5
votes
1answer
200 views

Are descriptive statistics sometimes more useful than tests of significance?

How does the biology community currently feel with regards to publishing descriptive and effect size statistics rather than significance stats? Almost every journal article I read in the cell biology ...
2
votes
0answers
69 views

What determines the (perceived) frequency of tinnitus?

I noticed that every time I suffer temporary tinnitus after going to a very loud concert, the frequency I perceive is identical. I'd put it somewhere around 17KHz, but it's difficult to pin down with ...
3
votes
1answer
79 views

Regeneration capabilities in humans?

To what extent can humans, (mammals in general), theoretically regenerate, and is their a way to speed up and/or exceed this original extent.
1
vote
1answer
61 views

What Conditions must Drugs satisfy for them to be Deliverable via the Transdermal route?

What Conditions must Drugs satisfy for them to be Deliverable via the Transdermal route? I assume a high $\log{P}$ (lipophilicity) would be one, are there any others?
8
votes
1answer
198 views

Are animals that live in areas where avalanches happen equipped to deal with that?

Humans take courses to learn how to assess the risk of avalanches and how to deal with it. Additionally, they often use special gear to survive avalanches if they got caught in the middle of one. ...
0
votes
2answers
70 views

What is a “tool strain”?

When a biologist is talking about a genetically engineered mouse strain which is a "tool strain", what does that mean? What is the exact definition of a tool strain? What is the difference between a ...
0
votes
1answer
1k views

How many nucleotide pairs code one gene?

As I know three nucleotide pairs (triplus) code one gene. But I have found next information in the "Molecular biology of the cell" by Bruce Alberts: Mycoplasma genitalium: it has only about 480 ...
1
vote
1answer
1k views

What is the appropriate blender speed to maximize nutrition and digestion of fruits and vegetables?

Blender companies state that a blender for smoothies should have speeds of at least 30000 rpm. They argue that only at 30000 rpm are cells of fruits and vegetables sheared enough to maximize nutrition ...
11
votes
2answers
2k views

Will humans and animals be harmed by frequencies outside their hearing range?

The human ear (for example) is sensitive to frequencies from 20Hz to 20kHz. Any sound beyond that limit would not be heard by us naturally. Will it harm us (effect our ability to hear) when we hear ...
2
votes
2answers
333 views

What exothermic reaction distinguishes warm blooded animals?

I would appreciate an answer specifically in the form of an exothermic chemical reaction. Namely, the one primarily responsible for generating heat in warm blooded animals that does not take place in ...
3
votes
0answers
36 views

Can a sound frequency 'not' within human hearing (20 Hz - 20 kHz) damage hearing when it is of high volume? [duplicate]

We can't hear sounds outside the range of 20 Hz - 20 kHz. However, if an inaudible sound is played at high volume, will one's hearing be affected?
3
votes
1answer
97 views

Antibody-antigen database

Is there a database where I can find an affinity estimate if I provide a given antibody and a given antigen sequence ? Input : antibody + antigen sequence Output : quantitative binding/affinity ...
1
vote
1answer
435 views

What is Chronic immobilization stress (CIS)?

I am trying to self study BNDF a little bit when I found this article: Abstract Stress impacts multiple systems within the CNS, including the hippocampus. A key molecular mediator in hippocampal ...
1
vote
1answer
80 views

Can IVF decrease the probability of trisomy in the fetuses of older mothers?

Is trisomy mostly due to complications with fertilization? If so, does in vitro fertilization reduce the probability of trisomy for the fetuses of older mothers? If not, can zygotes be screened ...
1
vote
1answer
83 views

What in soy are people allergic to and will these allergens be passed along if an animal that has eaten soy is consumed?

I have two related questions about soy allergies and possible reactions. What is it that are humans who have soy allergies actually allergic to? What is the allergen? If an animal eats soy, are ...
4
votes
2answers
90 views

Combining gene expression data from two species

I currently have two sets of gene expression data. The first is a dataframe of genes identified by Annotation id CG numbers (for example "CG10005") in one column and a numerical variable of interest ...
6
votes
1answer
148 views

Are all chromosomes equally susceptible to mutation?

The humans have been around for a few million years, other organisms longer yet. Changes that occur in the genome and propagate (may) eventually throw a new species ... or atleast branch off the old ...
14
votes
1answer
330 views

Fibonacci sequence in nature, truth or just wishful thinking?

I'm reading a bit on the Fibonacci sequence in nature, be it the golden ratio or the golden spiral forming over and over again in biological structures, and then I came across this online article by ...
0
votes
1answer
38 views

Does the Enzyme Monoamine Oxidase, Isoenzyme A have an allosteric modulatory site?

Does the Enzyme Monoamine Oxidase, Isoenzyme A (MAO-A) have an allosteric modulatory site? I ask because I would like to know if it is possible, in theory at least, for a positive allosteric modulator ...
0
votes
2answers
99 views

Is there any evolutionary/physiological advantage to multi-lateral symmetry?

Just wondering ; I get the impression a large number of multicellular organisms are multi-lateral in their physical structure. Why would evolution/mutation have retained multi-lateral symmetry in an ...
2
votes
2answers
157 views

What chemicals can be detected from one's sweat?

This question came to mind after reading this article. The article speaks of inducing sweating to determine by a roundabout fashion the amount of salt therein. I'm no medic but I find myself wondering ...
8
votes
1answer
665 views

How is instinctual information encoded?

If instincts are passed on through genetics, how is that information encoded in DNA? For example, spiders instinctively know how to spin webs. Does that imply that the algorithm for web spinning is ...
1
vote
0answers
31 views

Are anti-inflammatories useful for tendinosis?

I am wondering why some doctors prescribe anti-inflammatory treatments for conditions that are supposedly not inflammatory such as tendinosis. From my understanding, only tendinitis a swollen tendon ...
2
votes
1answer
856 views

Perception of artificial light - flickering

I noticed something strange a couple of years ago. I was walking down the street at night, when it struck me that the street lights were flickering. But, when I turned to take a direct look at the ...
2
votes
1answer
2k views

How does a thymidine block halt DNA synthesis?

The best I've been able to find is that there's a feedback mechanism, but what is this feedback, and how does the mechanism work? If it's just that the concentration of thymidine is too high, why ...
1
vote
2answers
309 views

By what mechanism does penicillin resistance usually develop in Streptococcus pneumoniae?

There are three mechanisms: prevention of the interaction between antibiotic and the target PBP; modification of the binding of the antibiotic to the PBP; hydrolysis of the antibiotic by a ...
2
votes
1answer
229 views

How does this diagram illustrate carbon cycling in lakes?

Could someone please explain the following process to me: This process refers to carbon cycling in lakes and is described in the context of $CO_2$ flux from lakes into the atmosphere. GPP is gross ...
0
votes
1answer
341 views

Does one neurotransmitter travel all the way through the nervous system?

Nerve impulses of course go really fast, but the neurotransmitters have to travel through millions of nerves, so how can it go that fast? Is it a sort of relay with lots of neurotransmitters taking ...

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