All Questions
28,576
questions
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Why can't syphilis pass from sharing food?
According to WHO:
Many STIs—including chlamydia, gonorrhoea, primarily hepatitis B, HIV, and syphilis—can also be transmitted from mother to child during pregnancy and childbirth. They cannot be ...
0
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0
answers
5
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Does the small ribosomal subunit read the mRNA?
During translation, what is the purpose of the ribosome?
I realise that the ribosome helps to catalyse the peptide bonds which makes sense. But I also read that the small ribosomal subunit reads the ...
1
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0
answers
20
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Can Gravity convection incubators negatively affect the growth of strict aerobic bacteria?
Background
Gravity incubators rely on natural convection for heat distribution. There is no fan or blower system, and the heat rises from the heating element at the bottom of the incubator.
https://...
- 197
0
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0
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14
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Is the amount of pigment in one feature (e.g. hair, eyes, skin) connected to the amount of pigment in another?
Let's say, genes allowing it, you have a red-haired child with hazel eyes. The hair is a darker/deeper orange color, so (if I recall correctly) having some degree of eumelanin—not much compared to ...
- 101
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0
answers
13
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How would a denser atmosphere affect plant life? [closed]
In a hypothetical scenario if the atmosphere got denser(assuming it doesn't become toxic for life & it let's light through) how would it affect plant life? What changes can you expect in plants ...
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0
answers
17
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histology books/ exam test banks/ resources [closed]
Would just like to ask if anyone has or knows any resources (may it be books, website, flashcards, testbanks) for histology?
Thank you in advance!
3
votes
0
answers
59
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What's this aquatic bug?
I have a small freshwater aquarium at home with only some aquatic plants at the moment. In the summer, I put some mud and sand from a local pond into the tank. At some point, I noticed a strange ...
- 131
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0
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19
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Why are the ducts of pancreas lined with compound epithelium?
Most other places with compound epithelium are in contact with the outside world, and that of course makes sense. So why would a duct snugly placed inside our body need stratified epithelium? Is it to ...
-5
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0
answers
18
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DNA Codons, Are $3$ and $4$ Life's Magic Numbers? [closed]
DNA has 4 alphabets, Adenine (A), Guanine (A), Cytosine (C), Tyrosine (T).
Genetic "words" are 3-lettered (triplet codons).
So, there are $4^3 = 64$ words.
There are $20$ amino acids and let'...
- 172
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answers
64
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Hardy-Weinberg Equilibrium Test Result for Merged Genotypes
I was curious if two populations are in Hardy-Weinberg Equilibrium (HWE), and if they are merged, then what happens? To find out, I considered populations from the 1000 genome project data. For ...
- 1
-2
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0
answers
25
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what is the number of chromosmes after a meiosis division of a cell with 12 chromosomes [closed]
what is the number of chromosomes after the meiosis division of a cell which has 12 chromosomes ?
well if we have a cell and the divison is meiosis then the 2 cells formated have 6 chromosomes each(...
- 9
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0
answers
66
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What are Palomena prasina doing in my home?
I live in eastern Europe, and every autumn, ever so often a Palomena prasina flies inside my home.
I have an avocado plant that I put them on to live - I currently have 5 of these on my plant
However, ...
- 117
0
votes
1
answer
29
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What happens if a lysosome is pierced and it's enzymes are made to get released
I am confused the results be same as it happens when lysosome gets damaged during some metabolic activity or different . If same the cell will die by the actions of those hydrolytic enzymes slowly or ...
-6
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0
answers
18
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Could a "bomber spider" exist?
Via the behavior in spiders known as ballooning, spiders can already fly. The next step may be to gain the ability to attack enemies while still airborne. Could a spider use a projectile, such as ...
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-4
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0
answers
81
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Do africans develop earlier than non african people?
In soccer, in the under 17 and under 20 categories, african countries (actually only Nigeria and Ghana) have won 8 world cups. In the senior category, they have won zero.
When you watch a match ...
- 2,787
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26
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I have written a simple algorithm using Maplesoft development system. It can in theory generate all possible DNA sequences [closed]
Here are the first 26 DNA chains. As a matter of fact, for every single positive integer I can
generate the corresponding DNA chain. I just have no idea to what creature it belongs to.
Supposedly ...
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0
answers
23
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How many GTPs are used in prokaryotic translation?
Here is the question: How many GTP are necessary to synthesize 2 linear peptides of 11 amino acids each using an in vitro prokaryotic system? Assume the tRNAs provided are already loaded with their ...
17
votes
3
answers
2k
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Are stable isotopes ever used in pharmaceuticals?
Carbon has two stable isotopes, C-12 and C-13. Since they both have the same electronic structure they can both make up the same molecules, but presumably they may perform different functions in ...
- 522
1
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0
answers
37
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What are the functions of coenzymes as substrate shuttles?
In my biochemistry textbook "Harper's illustrated biochemistry" it is written that
"Coenzymes serve as recyclable shuttles that transport many
substrates from one point within the cell ...
0
votes
1
answer
37
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BLASTN in NCBI strand Plus/Minus
I am a newbie in Bioinformatics. I am trying to understand terminologies used in NCBI BLAST system. Here is what I am trying to align:
So effectively I am trying to align two sequences with the ...
-3
votes
1
answer
88
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If split peas are good for health, why didn't evolution favour humans liking split peas?
Split peas, being legumes, are a source of food unanimously considered as healthy. My question is why didn't evolution favour humans that liked the taste of split peas? And/or maybe that could eat ...
0
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0
answers
44
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it is possible that a rabies dog barking transmission rabies [closed]
It is possible that a rabies dog barking transmission rabies tiny droplets of saliva on the wound，near to me，while i walking on the street.this there any medical case in the word？ Or we just need to ...
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0
answers
47
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How could an aquatic animals organ evolve so it could live outside water?
How could a fishes organs evolve so that it could one day live outside of water.
I mean did it one day fully evolve then stick it's head out of the water. That would mean that all the evolution of ...
- 11
0
votes
1
answer
33
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What species are these, beetle eggs?
I posted a thread the other day and identified I have carpet beetles larvae. I have a pest control company booked to treat the place on Monday but in the meantime I’ve found these little things on the ...
0
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0
answers
35
views
Where does water go in glycolysis?
One of the products in glycolysis is water. The muscle consumes the energy, the waste products along with the water are carried through the bloodstream?
Independently, if the core body temperature is ...
- 11
1
vote
0
answers
21
views
Strange Mitotic phase of oocytes in primary follicles
In the process of learning about the reproductive system, I find an oocyte enveloped by a single layer of follicular cells appears to be undergoing equal division, resembling a primary follicle ...
- 11
3
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0
answers
47
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Identifying a bone I found in Central France
I found this bone in Auvergne as a child. This specific area is apparently well-known to paleontologists and I found the bone in a field very close to scientific excavations (literally meters away ...
- 213
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0
answers
12
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How to pit viper pits maintain high sensitivity across a wide temperature range?
Pit viper infrared vision works nothing like our photochemical rods and cones. It would be blinded by its own thermal noise it if did. Instead, they are sensitive to changes of temperature [of only ...
- 1,266
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votes
1
answer
138
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Why can't fish extract oxygen from air?
I've read many posts here and elsewhere for example:
Wikipedia where breathing is well described, but does not answer the question (or anything close.)#
Wikipedia Gills, more specific, but still ...
- 17
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0
answers
12
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Is repeated exposure to near/mid/far infrared safe for skin and eyes?
I've been doing a lot of research into infrared saunas as they've risen in popularity. I've come across a fair amount of information about how harmful near infrared exposure can be to the eyes.
This ...
0
votes
1
answer
28
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How frequently does recombination occur, and how long are the recombinated fragments?
I understand the mechanics of recombination, but am struggling with the 'scale'.
When two homologous chromosomes pair, roughly how many recombination events occur on average? I understand there will ...
- 61
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votes
2
answers
66
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Insect Identification Request -- brown and white flea-like bug
So for context, this is a bug I found on the leaf of one of my young ginger plants, which I found a few days after watering. I have a few other tropical plants next to it, like a vanilla bean orchid --...
-1
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0
answers
28
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How similar are mouse proteins (EGFR, KRAS, etc.) to humans’?
Mouse models are widely used to evaluate anticancer drugs. There are two types of mouse models: immunodeficient mice engrafted with human cancer cells (xenografts) and immunocompetent mice bearing ...
- 515
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votes
1
answer
68
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Is this woodlouse or bed bug?
I have found 3 of these things in the main bedroom within 4 days of each other. A little freaked out, can someone advise if these are woodlouse or bed bugs? and now just added another pic (first pic?) ...
2
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0
answers
29
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Why is coconut a fleshy fruit?
Firstly, I understand that it is classified as a drupe and its mesocarp is fibrous hence its hardness. However, how did botanists conclude such? Putting both mango and coconut side by side, we can at ...
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0
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49
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Was there a time in the development of the field of biology that a lynx was considered a hybrid of a deer and a wolf? [closed]
Cornelius à Lapide, S.J. (✝1637), Commentary on Genesis 1-3, p. 74 gives a list of hybrids:
[…] animals that are engendered out of the union of different species, as the mule is from a mare and a ...
- 358
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votes
1
answer
81
views
What kind of insect appears in this photo?
For months my wife has been commenting about a white substance spontaneously appearing on black clothes. Under magnification, the substance appears to possibly be eggs. As you can see, the image shows ...
- 23
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votes
1
answer
22
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Why doesn't treating neurons with a high sodium solution depolarize their membranes?
I am reading a journal paper, and in one of their experiments they treated organotypic hippocampal slice cultures with a high potassium solution to depolarize the neuronal membranes:
We found that ...
- 1,647
0
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0
answers
22
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Plant (lamp) identification
I recently came across this lamp part and wanted to get a lamp shade in the shape of the matching blossom.
Does someone recognize the leaves?
2
votes
1
answer
98
views
Can a person have different sex at cellular level?
I mean like every cell has a sex chromosome.So does a male with XY chromosomes has all the cells in all the organs inside his body of XY chromosomes only? And vice versa.....
- 29
0
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0
answers
39
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Was there a first biological cell on earth? or a similar cell originated simultaneously around the world?
It logically follows that if life began on earth and life is cellular, then either that life began singularly or began simultaneously around the world?
What is the evidence or argument for either ...
- 101
12
votes
2
answers
2k
views
Do the foldings in the brain vary person to person?
Can the gyri and sulcus, which are the foldings of the cerebrum, vary from person to person? If that is true, then can we say different people have different types of thinking skills? I believed that ...
- 354
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0
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25
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Introduction of critically endangered South Asian species to South America
I have in mind in particular orangutans but don't want the question to be that specific, so the answers about other species will be equally welcome.
Orangutans are endangered or critically endangered ...
0
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0
answers
14
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Can co-mutations be potential expression quantitative trait loci (eQTLs)?
I'm wondering if it is possible to test this and how? Usually we do this for single SNPs, I wanted to know if it was plausible for pairs of SNPs. Which method would you suggest?
I want to test whether ...
- 109
1
vote
1
answer
66
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What plants are these
These are aquatic plants. Anyone knows the name please? Well. For a week more and most of them stems rotted. So, wondering if its planted by submerged in the soil or what.
- 119
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29
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Calculate expected heterozygocity using Wright's F statistics (here, FIS)
I try to better understand Wright's F statistics. In general, there are many derivations and many interpretations, and in books, the parameters are called differently, that's why I am struggling.
More ...
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votes
1
answer
32
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Can an axon recieve signal from other neuron or axon of other neuron?
As there is a very complex network of neurons in our brain so could it happen that an axon can recieves a signal from another parallel axon ?
- 354
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0
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38
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Are there any plants that retrieve energy from the wind?
Many trees grow in windy places, but appear to have adapted to this by developing characteristics that provide resistance to wind.
Are there any plants that appear to have been selected for the ...
- 3,006
1
vote
1
answer
33
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Are all unicellular eukaryotic organisms protists?
I know that the Protists are in Domain Eukarya, and that some protists are unicellular. Are there any other eukaryotic group of creatures that are not protists that are unicellular?
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11
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Does aerobic exercise increase the incidence of disease via free radicals?
Aerobic respiration produces ROS, atleast one of which (the hydroxyl radical) cannot be neutralized by any known antioxidant and is always damaging surrounding tissue. I know ROS plays a role in ...
- 307