9
votes
2answers
345 views

Why do women live longer than men?

According to Wikipedia and many other sources, women live substancially longer than men (over 5 years in the U.S.). Men can reproduce for much longer than women. So longer living men would have the ...
1
vote
1answer
97 views

Alcohol and athletes? [closed]

I've seen a lot of articles claiming that alcohol has a very bad impact on athletic performance. Examples include, but are by far not limited to: http://oade.nd.edu/educate-yourself-alcohol/alcohol-...
0
votes
1answer
894 views

What is the function of dendritic cell in immunity?

I'm interested in how dendritic cells present antigens to helper T-cells? I'm also interested in the molecular actions between a dendritic cell and a helper T-cell during the activation of the helper ...
5
votes
1answer
249 views

Where to find E.coli gene expression data?

I am searching E.coli whole genome expression data with different conditions, any suggestion is appreciated. Condition could be for example different growth temperature, different medias, etc. I have ...
4
votes
1answer
121 views

Do sweat pores change diameter?

In Cholinergic Urticaria, some people believe that the itching which is generally more in winters might be because that the diameter of sweat pores is less due to less activity(less sweat production) ...
1
vote
1answer
413 views

How do the homologous chromosomes pair up and position themselves along the center of the cell? [closed]

I am not sure... Most textbooks just state "they line up" but I don't know how... Something to do with the cytoskeleton or microtubules? Thanks for any help
0
votes
2answers
125 views

Difficulties understanding a pathway [closed]

I am not a biologist and I would love to understand what is going on with this pathway. I went to the description but it's still complicated, and I couldn't follow. Can someone please help me with it? ...
2
votes
6answers
163 views

Which information can be obtained from a list of gene names?

Lets say I only have a list of gene names. I know they are up regulated and I know they are related to cancer. What information can I obtain from having only the names of genes? For example is there ...
2
votes
1answer
1k views

What is the difference between sinew and tendon?

I wonder what the difference between sinew and tendon is. I searched for it but didn't get any clear answer: https://www.quora.com/Whats-the-difference-between-sinew-and-tendon: They are often ...
3
votes
1answer
127 views

Why we have just 2 teeth cycles, primary and secondary not more?

After baby teeth go, secondary teeth grow, is there a scientific reason why they are just 2 sets not more?
1
vote
2answers
402 views

Why can newborns swim?

I am wondering for someone to discuss the phenomena that newborn babies (humans) are able to submerge underwater up until a few months where that ability is lost again? What is the explanation for ...
5
votes
1answer
596 views

How precisely can we sense temperature differences?

We have thermoreceptors, thus we can sense temperature (both warm and cold). I'm interested in the sensitivity of our thermoreceptors - What is the smallest temperature difference that we can sense? ...
10
votes
2answers
612 views

Why did humans evolved the scratch reflex?

I've been wondering about this for some time, and I can't come to an answer... Everybody keeps telling me that scratching one's own skin is bad. It damages the epidermis, creates the hazard of ...
1
vote
1answer
312 views

Pasteurization and Bioavailability of Antioxidants in Beet Juice

What are the effects of pasteurization on the antioxidants found in beet juice ? Does the process render most of the beneficial nutrients (betaine) useless and make them unable for the body to process ...
4
votes
1answer
126 views

What is the impact of stress on the human body?

Can stress trigger any changes in the human body? I'd like to know more about things less commonly known than, for example: sweating and tiredness. What are the long term risks of chronic stress? Do ...
4
votes
2answers
160 views

SNPs in DNase hypersensitive and histone marks sites

I am investigating a role of SNPs in DNase hypersensitive sites and in the DNA regions of histone marks and have some questions about it. SNPs in DNase hypersensitive sites might mean that those SNPs ...
1
vote
0answers
204 views

Measuring a plant's electric activity any instructions where to place electrodes?

I would like to measure a plant's electric activity / voltage, I've looked online to find out where to place the electrodes and what type of electrodes to use but they seem to very wildly. Any ideas? ...
2
votes
1answer
1k views

Why do humans stop growing? [closed]

Humans grow most quickly when young, and to a lesser extent in preadolescence and early adolescence. However an equilibrium is then reached in adulthood, typically at around 1.6/1.7 meters tall. I ...
1
vote
1answer
26 views

Ways to cause membrane damage to microalgae and yeast?

I am researching a way to monitor the membrane damage of cells. To do that I fist have to have reference points, namely, cells with damaged membranes. I am working with Dunalliela, Hematococcus (both ...
12
votes
3answers
2k views

Does taking a shower have the same effect on muscles as warming up?

When playing sports, coaches and trainers are always very clear that it is necessary to warm up and stretch. But sometimes athletes sometimes want to get an extra stretch in and don't want to go ...
2
votes
1answer
32 views

Which is the guideline to choose a molecular target to identify vertebrate hosts from arthropod bloodmeals?

There are some molecular targets to identify vertebrate hosts from arthropod bloodmeals including the Cyt b gene and the COI gene. Which are the standards or characteristics that I have to bear in ...
2
votes
1answer
76 views

Which sources can I use to study botany and horticulture?

I refer with this question to those among you who have a strong background and work in fields like: botanics, horticulture, dendrology, etc. I would like to start building a solid preparation, both ...
3
votes
1answer
2k views

Differences between Gradualism and Uniformitarianism

From what I understand, gradualism is the idea that small changes affect species over time. Uniformitarianism argues that the same processes that occurred in the past are the same as those in the ...
5
votes
1answer
560 views

Why do apples taste sweeter at the bottom?

Sometimes when eating an apple, I notice that the bottom (blossom) end of the apple has a lot more sweetness and flavour to it, whereas the top half (stem) is often more watery, crispier and feels ...
2
votes
1answer
57 views

Do all kind of unicellular asexual reproductions let mutations happen, resulting in evolution?

I know about fission, an unicellular asexual reproduction method, where the mother cell splits into two daughter cells. Does this kind of asexual reproductions let mutations happen, leading to much ...
9
votes
1answer
658 views

What is this pink-flowering plant found in Shanghai, China in March?

This plant appears to have fleshy protrusions resembling flowers growing out of its stem (although I am unable to identify them as such). Does anyone know the identity of these plants?
3
votes
1answer
542 views

How is excretion of metabolic wastes from a cell related to its size?

As with anything that is taking place within a cell, the metabolic waste too must be proportional to the size of the cell. In particular the surface area to volume ratio. But how is the waste ...
6
votes
1answer
168 views

Are there any mutagens that can undo the mutations they cause?

I was reading a section from my textbook about tautomeric shifts, and it seems to suggest that there are some mutagens that can be directly responsible for the phenomenon. The section is mainly ...
8
votes
2answers
200 views

Is it possible for a human to wake up in a wrong way?

There's an old folk saying that goes like "He got out of bed on a wrong foot" - to indicate that the person's day is going poorly because of the way that person woke up. Is it is possible for a human ...
5
votes
1answer
325 views

Ethanol production by fermentation?

As bacteria are involved in the production of ethanol through fermentation and ethanol is also used as antiseptic that kills bacteria, so how and why bacteria are involved in the synthesis of such ...
5
votes
1answer
375 views

Understanding recombination scoring in family pedigrees

I am having some problems understanding recombination, and I am not sure what element I am missing here. This figure is an example from my text book. The pedigree belongs to a family with an autosomal ...
5
votes
1answer
83 views

Location of TFBS in genome

I have an annotated set of SNPs and I would like to explore the difference in the binding affinity of the transcription factor (TF) if I have a SNP in my locus. As my SNPs are annotated (I know wether ...
8
votes
3answers
374 views

Why are triacylglycerols broken down before being absorbed?

So when dietary fats are in the small intestine, they are emulsified by bile salts in order for action by lipases to occur. Lipases degrade the triacylglycerols into monoacylglycerols, ...
6
votes
1answer
54 views

Are there mechanisms that limit the amounts of time conjugation and F-plasmid transfer can happen? If yes, what are they?

Not all bacteria have acquired F-plasmids through conjugation. Some of the mechanisms for this are unsuccesful conjugation events (mechanical disruption), no transfer due to integration in bacterial ...
0
votes
1answer
94 views

What are iPSC cells, and what are their applications? [closed]

I also searched it on internet, and just basically know it's related to the Stem Cells, but there are too many resources, can anyone help me find out more about them, like their applications? They ...
3
votes
2answers
90 views

RNA polymerase question

In this question we are examining a bacterial RNA polymerase that elongates at 20 codons per second. Question 1: How long will this RNA polymerase take to transcribe the Lac Z gene at 3510 base pairs? ...
2
votes
1answer
183 views

What exactly is neuroplasticity, and can it be demonstrated with a simple experiment?

As far as I know, neuroplasticity is about restoring brain functions by moving some functions to other still functional. Neuroplasticity is more prominent in children than in adults. What are other ...
6
votes
1answer
357 views

Is there a formula for determining the % of ligand bound to a given receptor in a mixture with multiple ligands and receptors?

When a ligand and receptor interact with a given kd, one can easily determine % of ligand bound to the receptor when the kd, total concentration of ligand, and total concentration of receptor are ...
5
votes
2answers
209 views

Why is living muscle tissue seemingly able to restore its shape under force, while dead tissue is not?

When I press my finger, even with relatively little force, into beef or chicken (say, at a grocery store), the indentation remains. When I poke a cow with my finger, the indentation does not remain. ...
4
votes
1answer
2k views

Does the human hand have 27 degrees of freedom?

I have counted the degrees of freedom in my hand over and over and I keep getting the number 19. Suppose each finger has 3 degrees of freedom. Then 5 * 3 = 15. The wrist can rotate around or back and ...
11
votes
1answer
379 views

Is there a significant difference in sedentary calorie-burn between a thinker and non-thinker?

I've read that, on average, a sedentary female burns between 1,600 - 2,000 calories and a sedentary male burns between 2,000 and 2,500 calories. I've also read that the brain itself burns quite a few ...
4
votes
2answers
121 views

Evolution theory - roses spikes - being more bulgy doesn't give you advantage

I've seen spike, huge spike. And I thought that development of such spikes could be contrary to the evolution theory. Being „little more” spiky doesn’t give you any advantage... So those ...
4
votes
2answers
1k views

Are nucleic acids found in cell membranes?

I've found various results online and I was recently marked in on an important test as wrong when I made the assumption they were not found in the cell membrane. Does anyone know what the correct ...
3
votes
1answer
91 views

Why are killer whales found in the Gulf of Mexico smaller than ones found in the Pacific?

I recently found out that there are killer whales that live in the Gulf of Mexico, but they are smaller than killer whales that are commonly found in the Pacific Ocean. Why is it they are smaller in ...
0
votes
1answer
68 views

What would happen if we had a device that produced oxygen inside of our lungs? [closed]

Hypothetically speaking, suppose there is a device that produces a limitless supply of oxygen. The device is inhaled by a human and is resting inside the (a) lung. What would hypothetically happen if ...
3
votes
1answer
122 views

Safe parameters for external nerve stimulation using electrical impulses

Introduction I've recently stumbled upon David Eagleman's TED talk on the concept of sensory substitution and addition. Being the most inspiring thing I've seen on the internet for the last few ...
2
votes
1answer
49 views

Cysticercoids of Eucestoda

I have found the following pictures representing cysticercoids of Eucestoda. If I correctly understand the right part of the picture, I would say that the development of the scolex is portrayed on ...
9
votes
3answers
338 views

Splice in with CRISPR/Cas

I need to splice a gene into a human cell genome, with highest rate possible. I mean, doesn't really matter where the gene enters, nor does it matter if some cells die as a result of this. CRISPR ...
9
votes
1answer
220 views

Why does polyploidy give an evolutionary advantage?

I would like to know what advantages polyploidy holds. I have come across a few examples during my research of polyploidy, for example human adults' hearts contain 27% diploid, 71% tetraploid and 2% ...
1
vote
0answers
18 views

Can I use my extech pH60 meter to measure soil pH if so how? I included a link to the meter [closed]

Can I use my extech pH60 meter to measure soil pH if so how? I included a link to the meter. Extech pH 60

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