-1
votes
1answer
7 views

mRNA Transcription from Nuclear DNA

How does a cell "know" the coding strand vs. the non-coding strand of DNA during transcription of mRNA?
0
votes
0answers
9 views

Genetic Code Question [on hold]

The following template strand contains codons encoding the beginning part of a polypeptide. Which of the following amino acids is the fourth amino acid found encoded from the beginning/start of the ...
-1
votes
0answers
7 views

A lifeform similar to known lifeforms, with one difference

What would the feasibility be of a lifeform where sucrose serves the purpose of glucose, and what other differences might be necessary? Perhaps some way to get around spontaneous glycation issues?
4
votes
1answer
34 views

After how many generations descendant is not more related to ancestor, than to a random individual in an ancestral population?

Descendant of n generation has on average 1/2n DNA of ancestor. (For example children have 1/2 DNA of parents and 1/4 DNA of Grandparents, After 10 Generation 1/1024 DNA and after 100 Generations ...
0
votes
0answers
7 views

How does menstruation proceed during one period?

I'm simplifying things here: A. Does a woman bleed constantly, like a drop every 10 minutes? Two hours without pad or tampon and your underwear is dirty? or B. Does a woman bleed suddenly a ...
2
votes
1answer
210 views

What are hot spots on human body?

Recently I have just discovered that a certain amount of the mobile phone frequency can be absorbed by human tissues. For example, this is the SAR info of iPhone 4s: Head: 1.180 W/kg 1 g Body: ...
1
vote
1answer
15 views

Dehydration by a tea, coffee, beer etc

For the long time I am trying to find out if the following is truth: They say that some beverages dehydrates. I heard that about tea (sometimes green, sometimes black, sometimes both), coffee, beer ...
3
votes
1answer
45 views

How long does it take to form a peptide bond?

What is the time taken to form a peptide bond in vivo or in vitro? It isn't mentioned in my course on protein structures. I was just curious to find out if any time scale is known? Given that ...
0
votes
0answers
27 views

Phenotype choice for one of a MZ twin pair in a genetic association study

I was having a discussion with a colleague and this question came up... It is commonplace in molecular genetics studies to only genotype one of a pair of monozygotic twins (and then implicitly impute ...
4
votes
1answer
61 views

How can we calculate the minimum sustainable number of the panda population?

I have a degree in Biology so I'm a little embarrassed that I never learned this, but... How do we know 1600 Pandas isn't enough? I know that we have historical numbers (although I couldn't find ...
2
votes
1answer
38 views

How do C. elegans manage nutrition?

If there is ample amount of food, do C. elegans worms know when to stop eating or do they store extra energy? Could they put this extra energy to use by moving faster or putting more eggs?
0
votes
0answers
18 views

What are the differences between a benign tumor and swelling? [on hold]

What are the differences between a benign tumor and an injury related swelling? And can swellings due to injury turn into a benign tumor?
4
votes
2answers
1k views

Is there an organism which has a common English name which overlaps with another organism's scientific name (or vice versa?)

Many organisms have their common names identical to their scientific names. For example, there exist apes of the genus Gorilla known commonly as gorillas, and plants of the genus Delphinium known as ...
2
votes
1answer
15 views

Can an upper forearm amputee correctly control the Median and Ulnar nerves

I'm an engineer who is looking to build a robotic hand for people without their upper forearm(from center of forearm in direction of hand), controlled by the Thalmic Myo(an EMG sensor). I am first ...
3
votes
0answers
18 views

Non-harmful bacterial invasion of cells

There are bacteria that can enter body cells as parasites. Could it be that some of these are benign, such that the guest will not kill the host cell it lives in (in human)?
2
votes
0answers
29 views

eradicating h.pylori naturally

This question is not to discuss whether substances with anti-h.pylori agents works or not, or the pros and cons of such but from a medical perspective. Assuming that one manage to control, reduce, or ...
3
votes
1answer
192 views

RNA isolation from Drosophila head

I need to isolate RNA from Drosophila head. I basically chop the head off and first homogenize it with a homogenizer (similar to this: ...
3
votes
0answers
10 views

How much total RNA can be extracted from Drosophila brain

I am wondering how much total RNA could be extracted from a single D. melanogaster brain. I could not find this information from the literature. The closest hit was this paper: ...
2
votes
2answers
50 views

Converting fmri data to association matrix

I am currently working on a new tool for the analysis of (large) weighted networks. Association matrices (correlation matrices) as obtained from fMRI data are perfect examples of the kind of data I am ...
0
votes
0answers
10 views

More general usage of the term 'congener'

In taxonomy the term 'congener' refers to two species within the same genus. In more colloquial usage, it can refer to any two objects within the same category. Is there a way to refer to related ...
8
votes
3answers
356 views

Organism identification, what is this?

Im trying to find out what this is, see image below. Im thinking these are either some insect eggs or some sort of mosslike plant. The substance is stuck to a steel pillar, outside, about 5 feet ...
3
votes
2answers
53 views

Are nutrients absorbed in human esophagus?

Following this question regarding absorption in human oral cavity (sadly not yet fully answered), I'm curious if any nutrient absorption occurs during the descent of food through the esophagus. And ...
1
vote
2answers
102 views

How does DNA damage cause ageing in yeast?

As I understand it, in yeast ageing there is daughter cell and mother cell. The daughter cell is has newly "fresh" DNA and mother cell dies after some counts of replication. What happens to the ...
3
votes
3answers
21 views

Kinetic Vs Potential Energy in Biochemical Contexts

This question is causing great confusion in my head. Which of the following is an example of potential rather than kinetic energy? A) the muscle contractions of a person mowing grass B) water ...
2
votes
2answers
33 views

Conversion of glucose to glycogen

Why is excess glucose, as a glycogen, stored in only a limited amount as compared to the lipid in our body? Why is mature glycogen arranged (polymerized) in 12 tiers polymer?
-1
votes
0answers
36 views

What is it a swell in the body? [on hold]

When I get hurt, for example injuries to a bony part causes it to swell...like a little mountain. What is it actually? Does it happen in other places on the body?
-1
votes
0answers
16 views

Microscopic Organism [on hold]

I was looking under my microscope and saw this... I asking about the long organism with a circular head... I observed it moving and wanted to find out what this was. Thank You
6
votes
5answers
421 views

Relationship Between Evolution and the Increase of Entropy of Earth

I was confronted by this question: Biological evolution of life on Earth, from simple prokaryote-like cells to large, multicellar eukaryotic organisms, A) has occurred in accordance with the laws ...
4
votes
1answer
27 views

Plural of “dibamus”

Migrated from English site. Dibamus is a genus of legless lizards in the family Dibamidae, of the infraorder Dibamia. Genera are usually given in singular, so what is the correct plural of ...
4
votes
1answer
26 views

Mechanism of Decorticate & Decerebrate Posturing? Also why is only Decorticate Rigidity a misnomer?

I read these two from various books, and got confused. The confusion is - Reticulospinal tracts control gamma motor neurons. Gamma motor neurons control tone of muscle. In decerebrate rigidity, the ...
5
votes
1answer
39 views

Repair wrong DNA pair after ending replication?

If there are wrong DNA pair, for example A=G, is there mechanism that could repair such things - after the replication was finished? Or it happens only during replication?
10
votes
4answers
2k views

Why can cones detect color but rods can't?

I don't know if this question applies to only humans but why can cones see much greater detail than rods? Is it possible to have a rod that can detect light intensity and color?
2
votes
0answers
18 views

How long can a human neuron cell live outside the body in a controlled environment?

Have there any experiments been to keep neurons alive (stationary) without preserving methods such as freezing? If yes, for how long?
4
votes
1answer
39 views

Why do the proportion of predators increase at mass extinction events?

Why does predation surge with mass extinction? It is caused by extreme selective pressures over resource competition that forces certain species to adapt to predatory niches?
2
votes
1answer
36 views

What equipment is needed to perform simple plant electrophysiology?

What is the minimum needed equipment to perform simple plant electrophysiology? I am looking for some simple experiments that I could run at home for learning. Ideally, I would transfer the skills to ...
4
votes
1answer
48 views

Are some facial features more important than others in human facial recognition?

I'm often surprised by the human ability to correctly identify other individuals despite significant modifications due to ageing, hairstyle, injury etc. But, sometimes the addition of a beard and a ...
0
votes
0answers
20 views

How was the origin of CTVT parasitic cancer determined?

The wikipedia article on CTVT says that the tumor cell has 57-64 chromosome while a normal dog has 78 chromosomes. Similarly while all chromosomes in dogs except the X and Y chromosomes are ...
8
votes
1answer
2k views

What is the female equivalent of the morning erection that some men experience?

There was question about what causes "morning wood." It was answered that the erection in the morning is caused by decline of norepinephrine during REM sleep. Which in part allows to prevent ...
-1
votes
0answers
26 views

Why Muscle Popups? [on hold]

I am a swimmer, I swim 6 times a week 3 hours every time. After almost every train when I get to absolute rest, my hand muscle popup... and just lately I have noticed that once in a while my ...
5
votes
1answer
556 views

Have there been studies done to test Immortality of Cancer Cells on culture?

The article here says cancer cells may be immortal. I am wondering if there has been any research done to find if cancer cells are really immortal. How old is the still maintained living oldest ...
4
votes
1answer
24 views

Why is hyper pigmentation the common aftermath of skin lesions and abrasions?

I'm aware that melanocytes produce melanin, giving color to the skin, but why are these cells recruited or overactive when healing skin abrasions, lesions and sores when T-cells and inflammatory ...
4
votes
1answer
17 views

Can methylation of a promoter induce gene expression in some rare cases?

Can methylation of a promoter induce gene expression in some rare cases? I've read somewhere that methylation of an intron can induce gene expression (eg. Igf2). How is that even possible? Thank ...
2
votes
1answer
63 views

Why do moths not die when they fly into a window?

Sometimes at night when I'm inside with a light on, I can hear (I'm sure) moths fly into the window, and it's so loud I can sometimes hear it over the TV from the other side of the room. Since ...
4
votes
1answer
55 views

How often does bacterial transformation happen?

I have been reading: M. Dröge, A. Pühler, W. Selbitschka, "Horizontal gene transfer among bacteria in terrestrial and aquatic habitats as assessed by microcosm and field studies", Biol. Fertil. ...
5
votes
1answer
87 views

Which of the two mitochondorial membranes relate to bacteria according to the endosymbiotic theory?

I seached for endosymbiotic theory in Wiki and I found this about endosymbiotic theory: Symbiogenesis, or endosymbiotic theory, is an evolutionary theory which explains the origin of eukaryotic ...
0
votes
0answers
16 views
7
votes
3answers
15k views

Does Human Female Meiosis II occur after fertilization with sperm?

I am reading the answer and I am getting confused by the sentence: At the end of meiosis I females have two daughter cells and meiosis II only occurs if and when fertilization occurs by a sperm ...
2
votes
1answer
19 views

Does enzyme Km comparisons make sense?

I have encountered comparisons of the Michaelis-menton constant (Km) a few times. They say if Km of an enzyme is higher, then it's affinity to its substrate is lower. How does this make sense? Maybe ...
-1
votes
0answers
23 views

Why the dirt of human ear is yellowish? [on hold]

The answer to this questions would help also the people seeking for the natural facts.

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