5
votes
1answer
167 views

High frequency human genetic oscillators?

The most well studied genetic oscillators in human genomes are involved in regulating the circadian clock (which operates on an approximately 24-hour cycle) and cell cycle activity (with single cycles ...
3
votes
1answer
254 views

Identify this Harvestman

I spotted this guy in Switzerland. It's clearly an Opilione (Harvestman), but I really know nearly enough about this diverse group to be able to identify the species. Sorry, I didn't think to ...
9
votes
1answer
209 views

First RNA polymerase-mRNA

We know that RNA polymerase produces mRNA by reading DNA strand. Which enzyme produces the first RNA polymerase if other RNA polymerases are synthesized in the same way like other enzymes(proteins) ?
2
votes
1answer
147 views

tetrads in meiosis are held together by what

This is from SAT subject biology test practice question. The answer it gave me was both chiasmata and centromeres. I can understand they are held by chiasmata but why also centromeres? I looked it up, ...
3
votes
1answer
36 views

In chromatin, what are the differences among states, interactions, and structures?

I am new to the study of chromatin, and I am trying to understand what people mean when they write about chromatin states, chromatin interactions, and chromatin structures. What are the difference ...
8
votes
1answer
340 views

How should I feed and keep an ant queen?

I have captured wandering ant queen. I guess she was just fertilised and was looking for a place to start a hive. I'd like to create my own ant hive in artificial environment. I unfortunately only ...
5
votes
1answer
189 views

Lost Ability to Regenerate Body Parts during the Transition from Amphibians to Mammals

Why have higher-order animals lost the ability to regenerate body parts during evolution? Wouldn't it be better for survival? What is the evolutionary theory behind it?
2
votes
2answers
395 views

By what mechanism does elevated homocysteine level cause endothelial dysfunction and damage?

It has been stated that elevated homocysteine level causes endothelial dysfunction and damage. By what mechanism does this happen? Why is it the endothel where elevated homocysteine causes problems? ...
1
vote
1answer
128 views

Question about the DNA glycosylase enzyme assay/formamide gel loading buffer

Often for the DNA glycosylase enzyme assay we can see that the DNA glycosylase is incubated with oligonucleotide in 37C and then reaction is stopped by addition of formamide gel loading buffer (80% ...
2
votes
0answers
80 views

Why Mammals are unable to produce Essential Fatty Acids?

While we have to get them from our diet and if they aren't taken in our diet we will face disease.Then why we don't have the enzymes which are require for EFA synthesis???
5
votes
1answer
89 views

Why might you NOT observe a tradeoff between two life-history traits?

I have traditionally thought of and heard about life-history traits (e.g., size at first reproduction, number of offspring, size of offspring, survival, etc., etc.) as drawing from a finite pool of ...
12
votes
3answers
258 views

Why do some fruits have a much wider range of acceptable sizes than others?

Some fruits such as pumpkins can grow to be 100 lbs. Under different conditions, the same variety of pumpkin can produce a 15 lb. fruit. Both plants are healthy, and look the same except for their ...
0
votes
1answer
152 views

Schedules of mating for men

It’s simple deductive logic to follow that for a species to survive it must provide it’s offspring with the best possible conditions to ensure it’s survival – either that or to reproduce in such ...
0
votes
2answers
115 views

How can you explain the origin of life out of nonliving matter (abiogenesis)? [closed]

According to biochemist Robert Shapiro, the "primordial soup" theory is as follows: Early Earth had a chemically reducing atmosphere. This atmosphere, exposed to energy in various forms, produced ...
3
votes
2answers
4k views

Cranial Nerve Decussation

I want to get my head round this once and for all so if you guys could help me would really appreciate it! I understand lesions to the optic nerve. It is the other nerves that I find difficult. So ...
3
votes
3answers
137 views

More entropy: Atom or Macromolecule? [closed]

A question that appeared on my last exam was : Which of the following has greater entropy A) An atom B) A macromolecule The question doesn't specify anything else(i.e. type/size of atom or ...
7
votes
1answer
1k views

Does the human ear adapt to noise levels?

I have noticed lately that if I go to sleep, when I have my radio running, it is on lowest volume, I still consider it kind of loud. In the morning, when being on the edge of waking up, I hear the ...
6
votes
1answer
103 views

Absorption rate of Infrequently eating animals?

Clearly, creatures such as us humans, after vastly increasing the entropy of our food, expel most of the mass that we consume. Some creatures, however, do NOT get the opportunity to eat nearly as ...
6
votes
1answer
89 views

Can NSAIDs impact negatively the healing of tendons?

There are a number of articles regarding NSAIDs having a negative effect on healing conditions like tendonosis and tendinitis. From what I understand the channel through which they reduce inflammation ...
2
votes
1answer
89 views

Source of hydrogen in reduction of oxygen in electron transport?

What's the source of hydrogen in the reduction of oxygen to water in metabolism? Is this implying that half the hydrogen comes from NADH and the other half from lone protons?
1
vote
1answer
302 views

What is the recommended PPM when foliar feeding L-amino acids

It is said that L-amino acids such as histidine, methionine, aspartic acid, glutamic acid, asparagine and glutamine can revert plant stomata closure, increase quality of fruits and assist maturity. It ...
2
votes
3answers
277 views

Where are the evolutionary “inbetweeners”? [closed]

The problem I've always had with evolution is the actual lack of variation between animals. More specifically, the lack of observable gradual change between species. Take for example the hammerhead ...
5
votes
1answer
63 views

Does fasting improves immunity?

I have heard that fasting causes regeneration of memory cells(B- and T-lymphocytes) thereby improving immunity.Is this true? If yes, how?
4
votes
1answer
104 views

How Behind is the Human Mind (Latency of the Senses)

I would like to know if there is any research into the latency of human perception. Particulary: What is the minimum time for various inputs (vision, touch, sound) to be recognized by the conscious ...
5
votes
1answer
70 views

How can I tell if regulation is at the transcriptional or translational level?

I was reading a paper, http://www.pnas.org/content/109/8/E471.short, where the authors claim that (e475) Translation of the TfR (Transferrin Receptor) is regulated through sequences in the 3′ and ...
3
votes
1answer
497 views

How big can cold-blooded animals get?

It seems impossible to have reptiles the size of dinosaurs, just because they are really big! Did they have different systems of maintaining body temperature or maybe they weren't the exact type of ...
2
votes
1answer
63 views

What is the role of lamellar bodies in lung cells?

Lamellar bodies have been found to be secreted in lung cells many of their associated proteins have been identified. What is the current consensus or research on the function that these lamellar ...
2
votes
0answers
1k views

Why does skin sometimes suddenly itch when you stretch it? [closed]

Sometimes, when I bend over, areas of my skin like my back can suddenly itch quite intensely. Sometimes it may be another part of my body and the pattern seems to be a part of the skin organ that is ...
7
votes
1answer
252 views

How did these apples grow together?

I came through this pic while scrolling through facebook, and it was a bit strange to me. As far as I know apples have a corymbose type of inflorescence, in which a single pedicel ends in a single ...
6
votes
1answer
125 views

Sugar as a defence against bacteria?

An answer on another SE site mentions that sugar "at a certain level acts as a preservative". I've always been taught that microorganisms eat sugar and expel acids, that is why sugary food are ...
15
votes
3answers
1k views

Do probiotics survive digestion?

Pretty much this. I've been wondering if any of the yogourt and other "health" foods containing living probiotic cultures survive digestion to populate our intestines? If so, is there peer-reviewed ...
4
votes
1answer
182 views

Start studying mathematical biology from basics

I am really passionate about theoretical and quantitative biology and I would like to build my future career around this topic. I've just got my bachelor's degree in biology (ecology) but scince I've ...
3
votes
0answers
31 views

Division of Polar Body

The first polar body formed after meiosis-I is completed in oocyte, may or may not divide. Why is the statement that "it may or may not divide"? Is it random ?
4
votes
1answer
184 views

Beetroot white skin mould

Does a mould make a beetroot poisonous or inedible ? Lemon's mould for instance, makes penicillin, but it's green there, and I'm allergic to penicillin, would the white mould produce penicillin too? ...
2
votes
1answer
1k views

what is the difference between early blight of potato and late blight of potato?

apart from different fungus causing these diseases in potato, how are Early Blight of potato and Late blight of potato different?
3
votes
2answers
530 views

Is there a durable surface that ants can't pass?

I'm looking for a surface, that will be impassable for ant's yet not poisonous or easily decaying. One idea is water - they really can't cross that. But water easily dries and is quite uncomfortable. ...
1
vote
1answer
826 views

RNeasy Mini Kit low 260/230 ratio — can I purify this RNA for further use?

I used Qiagen's RNeasy Mini Kit to isolate RNA from 5*10^5 C28/I2 (immortalized human chondrocytes). However, my yield is low (~25 ng/ul), but my 260/280 ratio is great (~2.3), and my 260/230 ratio is ...
5
votes
1answer
254 views

How does someone with red-green colorblindness see yellow on a monitor/television?

I recently watched the video This Is Not Yellow explaining how red, green, and blue pixels can be used to create images of all other colors. Since yellow is created with red and green pixels, how is a ...
3
votes
1answer
49 views

Preventing paracetamol overdose

Paracetamol overdose is one of the most common drug toxicities. It may be treated by intravenous N-acetylcysteine which replaces the glutathione that is used up in paracetamol metabolism to prevent ...
1
vote
1answer
73 views

What I can do in order to improve the folding of the protein?

I am struggling with the expression of the certain protein. It seems that it is not properly folded and thus, it is not active. I tried to express it at the lower temperature and for the longer time, ...
2
votes
1answer
43 views

Muscle force/energy relationship

I found the Hill muscle model, which helps relate the force a muscle can generate to its change in length over time (its "contraction velocity"). Is there a similar model to get an idea of the energy ...
7
votes
1answer
140 views

Pharmacologically, can tricyclic antidepressants have a side-effect profile similar to neuroleptics?

Torticollis (wryneck, cervical dystonia) is a neurologic movement disorder causing involuntary muscle spasms in the neck. Often, neuroleptics can cause such a side effect. I'm wondering if this ...
0
votes
2answers
61 views

Is there any possible way that hybrids can mate?

I'm writing a book, and a a portion of it involves a society of humanzees. Now, is there any plausible way that a hybrid (such as a humanzee) could procreate either with one another, or with their ...
4
votes
1answer
123 views

Can you measure ECG from a single location?

I want to make a DIY bracelet to measure my ECG. All I need is the interbeat interval. Can I design a bracelet on one arm only, with two electrodes slightly spaced from one another, and figure out ...
7
votes
1answer
57 views

Is the number of legs in myriapoda determined entirely by the genome?

Myriapoda (comprising, among others, millipedes and centipedes) can have hundreds of legs (Illacme plenipes having up to 750 legs). Interestingly, the number of legs (or leg pairs) appears to differ ...
3
votes
1answer
72 views

Master Catalog of all Fossils / Literal Fossil Record?

Is there a website or other resource that catalogs all fossils ever found? Basically, is there a literal "Fossil Record"? Where do scientists gather their results from excavations? Are they just ...
3
votes
1answer
80 views

How to recognize a conserved motifs of the protein

I would like ensure that my reasoning is correct. Assuming that I know the aminoacids sequence of the protein of interest. I can't say anything about the structure looking only at the aminoacids ...
2
votes
1answer
82 views

Comparing Shine Dalgarno scores, creating a distribution

I am in the process of creating a poster for the phage that I recently annotated. The phage is an A4 and the portion of the poster I am working on is analyzing the data that we have collected. I have ...
2
votes
2answers
119 views

Does neuroeconomics study the brain or study economics?

I'm trying to understand what neuroeconomics is. There are two possibilities for what it might mean. (1) The study of cognitive processes in the brain by applying basic principles of economic theory ...
4
votes
1answer
139 views

Identification of this spider?

I find these in forests in Oregon, western half, though they're probably on the eastern half as well. They live under pieces of wood and bark, and have a small web across the ground. Mine will eat ...

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