0
votes
1answer
131 views

While someone's ears pops with pressure, can he/she hear other sound at the same time?

I know that after or before someone's ears pops because of pressure changes, he/she can hear the sound such as laughter. But can these two things ("her ears popped with pressure" and "she can hear the ...
-4
votes
4answers
160 views

Are biological systems engineered? They are often reverse engineered at a molecular level!!

Understanding biological systems, molecular biologists need to “reverse engineer” them. Is this evidence that the systems were engineered to begin with?
3
votes
1answer
37 views

Is there any database with RNA classification?

I am looking for a database that would provide classification of various types of RNA - information about its structure, function, etc.
4
votes
1answer
630 views

What is a “mechanistic study”?

I believe a "mechanistic study" means a study where a medicinal product is being used but the purpose of the study is to investigate the patient or disease, not the medicinal product. How does this ...
2
votes
0answers
127 views

What tests can be performed to test the purity and quality of the raw peptide HCG (Human Chorionic Gonadotropin)

What tests could be run to test the purity and type of HCG? We are looking to purchase HCG from China but the purity and quality varies between labs, we are able to receive samples of the raw peptide ...
3
votes
1answer
73 views

Hibernation, Metabolism and Aging

People are beginning to seriously research space travel applications of therapeutic hypothermia, specifically for reducing metabolism and stress on humans traveling to Mars. It seems that as you ...
7
votes
1answer
118 views

Do invasive species cause long-term damage to ecosystems they invade?

Growing up in the U.S., I was warned at various times of the dire consequences of a variety of introduced pests (usually insects). Japanese beetles, gypsy moths, and most recently the brown ...
5
votes
1answer
196 views

What is the lowest intensity threshold of light for photosynthesis in any species?

Recently, I was reading the question "Photosynthesis - light intensity, particularly the answer, that states that different species require different intensity of light. My question is what is the ...
-1
votes
1answer
62 views

Is there any definition of complexity about gene and protein according their function?

Sorry for such a question,if it is too naive. Is there any definition of complexity about gene and protein according their function?If so,what is the relation between them?
6
votes
1answer
221 views

Does a blood transfusion cure disease?

Does transferring blood between two people also transfer all the white blood cells? Why can't AIDS victims with low t-cell count just get blood transfusions till they have more t-cells? Why can't ...
1
vote
1answer
57 views

Telomere elongation methods?

What sort of telomere elongation methods are there currently? Would this stop aging? (edit: No, probably) I couldn't turn up anything good on google. I was thinking that maybe you could sequence ...
3
votes
2answers
142 views

Why do our eyes “wrap” hue from UV to IR?

On the high-wavelength side of things, we see almost-infrared as reddish, with a slight tinge of magenta. On the low side, we see violet fading into the same magenta color. Why is that? You can see ...
6
votes
4answers
467 views

Does RNA polymerase move around DNA or does DNA rotate benath the polymerase?

I'm thinking of the human genome specfically, but more general answers are welcome. As RNA polymerase moves along the DNA helix it follows a single strand. The two DNA strands are unwound locally ...
6
votes
2answers
113 views

Examples of references for mathematical approaches in bioinformatics that are applicable to linguistics?

Do you have any classic references for mathematical approaches in bioinformatics that are applicable to linguistics (or vice versa)? EDIT I am mainly interested in approaches to reconstruct the ...
1
vote
1answer
232 views

Why do rodents' teeth continue to grow?

Why do rodents' teeth continue to grow? Enamel formation and/or root formation continue throughout rodents' lives. What's the mechanism that causes this?
3
votes
1answer
58 views

What is an explanation of the dual role of calcium hydroxide in teeth?

Calcium hydroxide induces dentine formation in permanent teeth, while it causes resorption of tooth in deciduous teeth. How is this dual role explained?
2
votes
1answer
74 views

When DNA is at its uncondensed form, what can it do?

I think it can do two things: The cell may be duplicating the genome during S phase. The cell may be transcribing the DNA into mRNA. Question: Can the two activities occur at the same time or one ...
2
votes
2answers
57 views

Can we identify an individual from their palm lines

Can we identify an individual from their palm lines. Is there any uniqueness for palm lines among family members ?
2
votes
2answers
109 views

Can retroviral delivery systems “overwrite” genes?

As the question states, what are the limits of retroviral genetic delivery systems? Are they limited to adding additional gene sequences to a cell, or can they actually overwrite specified segments ...
2
votes
2answers
81 views

Can the colour of skin change with age

Can the colour of skin change with age? Can a dark skinned person become fair or vice versa? Can Melanocyte production vary?
0
votes
1answer
47 views

What is it the most common reason for community acquired pneumonia?

This is a difficult question because there are many types of community-acquired pneumonia (CAP): typical acute, atypical acute and chronic. Most common microorganisms are also different among ...
3
votes
1answer
39 views

Estimation of number of species at an earlier time

The estimated number of species on Earth, as reported in this article is around 8.7 million. I am fascinated by how nature produces such a wide variety of species. As per my understanding, many ...
2
votes
1answer
58 views

The difference between “Hunger” and “Appetite”

When I am "hungry", I need something to eat physically. But what about "appetite"? I think it is a psychological phenomenon. Is that correct?
2
votes
1answer
137 views

Does Blood Loss Shorten Telomeres?

If blood loss necessitates immediate cell division to replace lost cells, does the increase in cell division correlate to shortening of telomeres? Does it further cause the Hayflick Limit to be ...
1
vote
1answer
95 views

How are the correct tRNAs transported to the ribosome?

I have been trying to understand how the tRNA transporting the correct amino acid required by the ribosome reaches the ribosome. The only way I can imagine this happening is that all types of ...
2
votes
2answers
77 views

Why does the mixture of infant formula with saliva provide an ideal breeding ground for disease-causing micro-organisms?

From: http://www.nal.usda.gov/wicworks/Topics/FG/Chapter4_InfantFormulaFeeding.pdf Discard any infant formula remaining after a feeding. The mixture of infant formula with saliva provides an ideal ...
0
votes
1answer
193 views

Why is the liver the only internal organ of the human body to regrow?

Related to my earlier question, "How does the human liver regrow?", am curious as to why the liver is the only major organ that has this capability? Why is it that other major organs, such as the ...
3
votes
1answer
94 views

When was the purpose of bone marrow discovered?

I'm currently reading William Cheselden's book Osteographia or The Anatomy of the Bones, which was published in 1733 (for the pretty pictures, naturally; not up to date anatomy). When he addresses the ...
5
votes
1answer
505 views

Smallest unit on which selection can act

Traditionally, the individual was considered to be the smallest unit on which Natural Selection (NS) acts. Today, we usually consider the gene as being the unit of NS. Of course, we should also ...
3
votes
3answers
324 views

Is there variation of AT/CG ratio along species?

Chargaff's rules say that the number of Adenine of the number of Thymine in a genome are equal (nA=nT) and similarly nC=nG. This makes obvious sense knowing that C binds to G and A to T. But what ...
3
votes
3answers
412 views

What species have had their genomes sequenced/are being sequenced?

The human genome project released it's first complete genome nearly ten years ago. Since then many species have also been sequenced. I am trying to find a list of completed (and possibly ...
0
votes
1answer
210 views

Why are human eye colours limited?

Related to the question What causes the colors we see in eyes?, I am wondering why human eyes are restricted in colour. Most common eye colours are blue, green and brown. Why not yellow, orange, ...
2
votes
1answer
28 views

potency in preformed germ-line

In organism that have a preformed germ-line like Drosophila where germ cells are pre-allocated in the oocyte, are there technically no adult pluripotent stem cells since germ line cells can't be ...
2
votes
2answers
73 views

Tree census data for Sweden/Scandinavia?

Is anyone aware of any attempts to count or approximate the number of trees there are in Sweden or Scandinavia? I have a small popular science side project for which this would be useful
1
vote
1answer
582 views

What determines the size and shape of a cell

What determines the size and shape of a cell? They differ at different tissues / organs/ species
0
votes
1answer
38 views

What determines the strength of a tree

What determines the strength of a tree. A morphologically strong looking tree found broken down at trunk. can we determine the strength/ life of a plant
4
votes
1answer
60 views

Is there differences in components of saliva among species

Are there differences in the components of saliva among species? Also, do the functions of saliva differ between species?
1
vote
1answer
31 views

Is it possible to suffer from hyperthermia by spending too much of time in the hot springs?

People may tend to spend time in a hot water spring. Is it possible to get hyperthermia (like a sun stroke) due to this?
4
votes
1answer
82 views

Why is there sperm mitochondrial suicide?

The mitochondria in the sperm are digested upon entry into the egg, making mDNA inheritance exclusively female. What is the advantage of this? Wouldn't some male mDNA be beneficial because of the ...
0
votes
1answer
627 views

Is there any natural blue rose?

I had recently read an article that the possibility of having natural blue rose is extremely rare because of the absence of delphinidin in most roses. Are all blue roses just a product of ...
0
votes
3answers
109 views

What type of insect is this?

I'm naturally thinking this is a bee, but I cannot find it anywhere in any insect identifiers. I caught this picture on top of my doorway, it's about 1 1/2 inches in length, and its torso seems to be ...
2
votes
1answer
144 views

How does electroporation mediated recombination work?

For yeast and other organisms, DNA can be readily taken up into the cell naturally or through membrane disruption. What does applying a voltage to cells do exactly that allows more recombination to ...
0
votes
1answer
64 views

Creating expression template from PCR: What annealing temperature to use?

I am creating a transcription template for expression in PURExpress and was confused about the annealing temperature to use. I have two primers with the T7 promoter and an RBS on the forward primer ...
2
votes
0answers
350 views

What is the difference between “lineage restriction” and “differentiated” in terms of stem cell biology

Is there a subtle difference between these two concepts or are they basically the same thing? When I mean differentiated, I don't mean terminally differentiated.
-1
votes
1answer
42 views

Axial skeletal system

I was curious about a fact given in my biology textbook as to why the Japanese have 3 pairs o floating ribs unlike the rest who have just two?
9
votes
2answers
356 views

How does the genetic code evolve?

After looking at this question, some other questions poped in my mind. The DNA code is redundant, there are 20 amino acids for 64 possible nucleotide combinations. Therefore some amino acid are coded ...
3
votes
2answers
98 views

Why ducklings are yellow?

Why ducklings are yellow, what the evolutionary background for this? How could it help to survive? UPDATE I agree with comment below, I did remember then that ducks are wild animals too (when I ...
0
votes
1answer
34 views

Can we remove impacted teeth by key hole surgery?

Can we remove impacted teeth by key hole surgery, rather than an open technique, like lithotripsy?
1
vote
1answer
111 views

What is Growing on These Tree Leaves?(Image)

I found a seemingly diseased tree when I was out playing tennis yesterday... What is growing on this tree leaf? Is this a disease? If so, is it contagious? I have zero knowledge in botany, but I'm ...
0
votes
1answer
34 views

How to Diagnose this hepatitis A, B and C case?

Male patient who is working in the hospital and may be infected with contaminated blood had hepatitis with genome IA 5 years ago. His hepatitis A at that time was confirmed with the rise of anti.HAV ...

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