0
votes
0answers
1 view

weird dots in vision?

when i look at a white wall i see little colored dots moving in circles filling my whole visual view, just like the static on a tv but then in color. I thought everybody had this but recently i ...
0
votes
0answers
4 views

Is it true that flies are cleaning themselves when they rub their hands together?

Everybody's seen a fly rubbing its hands together like Mr Burns. And almost everybody's heard the standard explanation - that it's cleaning itself. Now, this is certainly a very plausible explanation, ...
0
votes
2answers
26 views

What are most common natural causes of death?

What are most frequently occurring natural causes of death?
5
votes
1answer
785 views

Why do we get 'bags under our eyes'?

Why do these circles form around the eyes if somebody is tired? And why does fatigue express itself around the eyes this way? Can I get eye bags very quickly in another way? ...
0
votes
0answers
5 views

Gut fauna genetics vs epigenetics

During childhood your gut fauna gets populated from the environment and the people you meet. Unlike baby koalas, we do not eat our parent's faeces to populate that fauna. The environment in your gut ...
0
votes
0answers
3 views

Oligomeric states of Phyre model

Is it possible to generate an oligomeric state for a phyre model? As it lacks crystal packing information "Generate>Symmetry_mates" obviously does not work in PyMol. I assume that the fit is not ...
42
votes
4answers
3k views

Why do smaller mammals move intermittently?

I was watching a nice little video on youtube but couldn't help but notice how snappy smaller animals such as rats and chipmunks move. By snappy I mean how the animal moves in almost discrete states ...
0
votes
1answer
16 views

Concentration of a specific promoter in a cell?

I want to simulate transcription activation by a given transcription factor (TF) with known kinetics. The binding rate $k_{on}$ is given in $\mu M^{-1} s^{-1} $, describing a bimolecular reaction ...
5
votes
0answers
171 views

How many ATP are formed?

What is the number of ATP molecules formed during the photosynthetic processes which consume 8 molecules of $\text{H}_2\text{O}$ due to noncyclic electron transport and subsequent ...
6
votes
2answers
179 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 ...
4
votes
3answers
87 views

Why do bacteria die in a high sugar content environment?

I was reading some questions in the test bank. Then in Chapter 27, I wonder why the answer is A. (undergo death by plasmolysis). Is the high concentration of sugar that kills them or the effects of ...
0
votes
0answers
13 views

Adaptation of deciduous trees in tropical climate

I'm planning to plant deciduous trees in my yard, i.e. maple and oaks. Normally, they grow well in cold climate region, such as Japan and Canada. But I lived in tropical climate region, Indonesia, ...
0
votes
0answers
10 views

Difference between genetic adaptability and micro evolution?

Do both occur at individual level? And which among the two is responsible for a species to maintain its specificity?
5
votes
1answer
1k views

What is our skin made up of?

Again, it is a basic question. What is our skin made up of? is it made up of many cells arranged in a systematic way or is it just like any layer say of a book?? what is the difference? where is the ...
8
votes
3answers
9k views

Why is it that cats can jump so high for their size, compared with humans?

My cat is about 1' high at the shoulder, and I am a little over 6', but my cat can easily jump onto something as high as I am. That is 6x it's height. If a cat can do this, then Why can't I jump up ...
0
votes
0answers
10 views

Cloning Stragedy

Recently I am learning about TOPO cloning in a class. I have questions regarding to this: In the TOPO-TA cloning, they use topoisomerase I to cut the backbone of the vector so it will covalently bind ...
0
votes
0answers
7 views

Placental Adherence and Premature Heartbeat

I am studying the placental adherence in premature fetuses i.e. from 22nd week to 38th week of gestational age. About 60% of placental adherences are diagnosed during labour, which increases the risk ...
4
votes
2answers
42 views

What is the definition of a mutation?

There are two alleles that determine the sensitivity of a person to Coumadin (a medicine for blood thinners used to treat a stroke etc). Sometimes you encounter the terminology that one has a mutation ...
0
votes
0answers
16 views

Does the source of caffeine affect the biological impact?

I've recently decided to give up my morning coffee in lieu of a caffeine pill. Both are around 200mg (my Tim Horton's XL 4x4 was 240 mg of caffeine) of caffeine. We were talking about the various ...
0
votes
0answers
26 views

Sexing fish from a tissue sample

How can you tell the gender of a fish from a tissue or blood sample and what equipment do you need (how much magnification in a microscope)? A bit more info: I am a member of a local fish club, we ...
0
votes
1answer
29 views

How and why do skin tags develop?

WebMD writes: Skin tags are small, soft pieces of skin that stick out on a thin stem. They most often appear on the neck, armpits, upper trunk, and body folds. The cause of skin tags is not known. ...
1
vote
2answers
28 views

How does the mechanism which controls blood pressure in the brain work?

I've heard that the blood pressure in the brain is organised by a special mechanism. What is that and how does it work?
0
votes
0answers
14 views

What is the effect of sodium chloride on head lice?

There are a lot of products that claim to kill lice and eggs. The main ingredient is sodium chloride. How does it work? I wonder if it has something to do with osmotic effects?
13
votes
1answer
113 views

How do burrowing animals get enough oxygen?

Tree borers make a small hole in a tree. At the end of it, they chew on wood to elongate the tunnel. They digest food and grow. All this takes oxygen. The entrance to the tunnel is generally small. ...
1
vote
0answers
22 views

Can the activity of bacteria be influenced by magnetism?

Some organisms are tuning their direction on a magnetic field. But are bacteria also reacting on magnetic fields and can it be used in health therapie as a kind of 'antibiotic'?
2
votes
1answer
23 views

What is it that specifically kills ALS patients?

ALS is a fatal motor neuron disease, and even though there are many different articles out there on the topic "How does ALS actually kill you?", none of them really delve deep enough into biology to ...
2
votes
1answer
19 views

What physical or mental actions can be picked up by EEGs?

There certainly seem to be a lot of gadgets and gizmos leveraging EEG technologies to the control of devices. This makes me wonder: what intentions/thoughts can be captured by EEG technology, and ...
1
vote
0answers
11 views

Is the efferent arteriole a pathway for filtrate through the nephron ?

I am studying the urinary system. I have to identify what part of the nephron is not a pathway for filtrate. I believed the collecting duct is not a pathway for filtrate because once the filtrate ...
3
votes
1answer
69 views

Good pipetting technique?

Good pipetting technique is essential for many biologists, but it can be hard to get right. When I take 1 µl of liquid using a micropipette, I seem to always take less than 1 µl, and that amount is ...
3
votes
1answer
80 views

Is the DNA different in each type of cell? What DNA is passed to offspring?

Our body contains many different types of cells and each of those cells have their own DNA (correct me if wrong) like skin cells their own DNA that makes them skin cells instead of muscle cells. So ...
0
votes
1answer
43 views

What causes swelling after impact?

Why does the head swell after getting hit by something hard? What is the liquid that forms after impact?
0
votes
0answers
106 views

Why did multicellular organisms evolve when a single cell can survive on its own? [duplicate]

Since unicellular organisms can survive, why would there be evolution of multicellular organisms?
2
votes
1answer
42 views

What do proton pump inhibitors do?

I know that sodium azide and 2,4-DNPH inhibit proton pumps. The azide is called an inhibitor and 2,4-DNP is called uncoupler. I want to know what's the difference between the mechanisms of action of ...
2
votes
2answers
44 views

Crossing over and exon shuffling?

Campbell Biology 10e, in discussing the functions of introns, writes: The presence of introns in a gene may facilitate the evolution of new and potentially beneficial proteins as a result of a ...
1
vote
1answer
27 views

amount of tRNA and its extra arm

How much of the total RNAs is tRNA? Some say 15% and some 20%. Those percentages came from my different teachers. Which is correct? And what are the functions of the extra arm (variable loop) of tRNA? ...
2
votes
0answers
14 views

Do primate RGCs have overlapping receptive fields?

According to this link, http://hubel.med.harvard.edu/book/b10.htm retinal ganglion cells (RGCs) receive input from overlapping receptive fields (RFs). This is also an idea used in convolutional ...
1
vote
0answers
15 views

Can the human body switch to a “starvation” mode? [migrated]

I've heard on multiple occasions from less than credible sources that dieting by eating less (usually implemented by skipping meals, not smaller meals) will cause the human body to enter some sort of ...
6
votes
1answer
69 views

Primary Productivity of Oceans

80% of the world's photosynthesis takes place in the ocean. Despite this, oceans are also said to have low productivity - they cover 75% of the earth's surface, but out of the annual 170 billion ...
0
votes
0answers
29 views

Why do denatured proteins tend to be less soluble than the native protein?

Why do denatured proteins tend to be less soluble than the native protein? In terms of hydrophobic effects, could anyone explain this phenomenon for me?
2
votes
1answer
28 views

Do only one or both pairs of homologous chromatids exchange genetic material during the process of crossing over?

To be specific: Assume chromosomes A and B are homologous. They've both replicated into A1, A2 and B1, B2 and have formed a tetrad at the equator (synapsis). Most textbooks show either A1 and B1 OR A2 ...
2
votes
0answers
12 views

How would one identify cellular transcription factors associated with a viral protein in a treated cell line?

I've been working as the computer guy for a microbiology lab for the past few months. I've always been interested in bench work, but my wet lab experience is rather limited and thus so is my ...
1
vote
1answer
64 views

Why is heart failure treated as more critical than kidney failure?

The heart pumps the blood to supply tissues and kidney always filters the blood to remove urea,extra water and etc. And all these are vital,so the kidney is as important as heart: and my question is: ...
2
votes
1answer
83 views

In the video, “Inner Life of a Cell”, what's the empty space between the molecules?

In the video, ["Inner Life of a Cell"][1,] there's a lot of empty space between the proteins. Is it just a simplification (i.e. they omit smaller molecules)? If so, what are the smaller molecules ...
0
votes
0answers
7 views

What is the function of the Moderator band?

The moderator band in the right ventricle is a band sorts of muscle which consists of a significant branch of the AV bundle. Does it mean it delivers impulses to the anterior papillary muscle faster? ...
0
votes
0answers
7 views

how to see prefrontal cortex works normally by a test?

Is there a test to see if the Prefrontal cortex of someone works normally? especially a simple test like a questionnaire that you give the individuals to fill out and based on their answer you obtain ...
17
votes
7answers
5k views

Why can't we see in low light if staring long enough?

For me it seems reasonable that if I kept my gaze on a fixed point in a room with low light, a progressively brighter and better picture would appear before my eyes, just like a camera can see in the ...
1
vote
2answers
26 views

Can DNA be denatured at acidic pH?

Some say that DNA is denatured only at basic pH. And some say at both acidic and basic pH. So I want to know clearly why and how if DNA is also denatured by basic pH.
0
votes
0answers
6 views

Energy efficiency of carbohydrate > fat conversion

How efficient is the human body in converting surplus carbohydrate into fat? E.g., if you have 100 calories' worth of carbohydrates at the start of the process, how many calories' worth of fat will ...
0
votes
0answers
22 views

Lifeforms concentrations of the categories of macromolecules, and Lipids

Lifeforms are formed of large, modular, organic molecules called macromolecules, large organic molecules called Lipids, and simpler molecules such as H2O. Macromolecules are commonly grouped into the ...
0
votes
1answer
30 views

Normal cell diffusion in normal organism?

We know, that cancer cell can travel across an organism. Is this ABSOLUTELY impossible for NORMAL cells? For example, is it EXACTLY ZERO probability to find some bone cells inside liver or some skin ...

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