2
votes
1answer
35 views

Why is there no U3 snRNP in the spliceosome complex of transcription initiation?

snRNP U1,U2,U4,U5,U6 are present in the spliceosome but there is no mention of U3.
2
votes
3answers
6k views

Why do our eyes close when we sleep?

Why do our eyes close when we sleep? Is it to relax our eye muscles? How can it be explained from an evolutionary point of view?
1
vote
1answer
71 views

Evidence of species transitions [closed]

I had a debate with a person who believes in some kind of creativism, let's call it that way. And in the middle of the "debate", an interesting question popped up. What are evidences of ...
0
votes
1answer
25 views

Lack of yolk in mammalian oocytes as compared to other vertebrates?

Why do mammalian oocytes have little to no yolk? How does it compare to other vertebrates such as frogs, fish, and birds?
4
votes
0answers
32 views

How do disulphide bonds in hair cause curling?

I understand that the asymmetrical distribution of disulphide bonds in hair cause curling, but do not completely understand why this causes an inherent curl on the macroscopic level, for several ...
1
vote
1answer
36 views

Was the frequency of mutations more during primitive earth due to radioactivity?

Primitive earth was more radioactive (or was it really?) according to radiometric analysis of C14 which suddenly appeared at 4250 million years in the Hadeon eon. Is it possible that ancient high ...
3
votes
1answer
126 views

Why are cancer rates low in large animals?

Large animals generally have more cells and live longer than smaller animals. For example, bowhead whales live up to 200 years and weigh up to 100 tonnes, as opposed to humans (living ~71 years and ...
0
votes
1answer
46 views

Can memory be improved with mental training? [closed]

I am a man in his mid thirties, but I already have a pretty bad memory. (I have always had a bad memory.) I can remember certain kinds of facts and music very well, but when it comes to words or even ...
0
votes
1answer
36 views

Are scientist able to correct mutiple gene defect in our body by using CRISPR

Are scientist able to correct mutiple gene defect in whole body by using CRISPR recently? AS i know, it is in a beginning stage
2
votes
0answers
39 views

Why are eye defects so common? [duplicate]

The title says it all, what makes eye defects so common in the world? Whereas defects of any other body part is quite uncommon, I searched online and one of the articles said that 6 out of 10 people ...
2
votes
3answers
158 views

Swapping genes?

So, gene therapy is to take out a gene, correct its mutation, and put the corrected one back into the organism, right? Is it also possible to take out a gene from an organism and put in a totally ...
4
votes
1answer
54 views

What is the purpose of THC for a Cannabis plant?

Why does a Cannabis plant produce THC? This question is brought up drawing an analogy to nicotine in tobacco, where nicotine is developed by tobacco plants as a pesticide. Is THC a pesticide as well? ...
0
votes
1answer
25 views

Polar bodies fertilization

Suppose a sperm fertilized a 2nd polar body( haploid) is there a chance of somewhat normal development?
3
votes
1answer
17 views

Do fish increase or decrease pH of aquarium water?

If I understand it correctly, aquarium fish produce NH3 as their waste product and CO2 due to respiration. Producing NH3 increases water pH due to its equilibrium with NH4+. Producing CO2 decreases pH ...
0
votes
1answer
19 views

Influence of artificial sunlight on the human body

In a hypothetical scenario, where a large, permanently manned craft is in a continual orbit, and natural sunlight cannot be used as the craft may keep moving and turning, artificial sunlight is used ...
4
votes
0answers
84 views

Why do mammals produce more carbon dioxide than insects?

I understand that mammals produce more carbon dioxide than insects on a gram per gram basis, but why is that? I'm thinking it might be because mammals are warm-blooded, which require more energy ...
10
votes
1answer
99 views

Unilateral damage to vagus nerve

Context: The vagus nerves supply the neck viscera, heart, lungs and gastrointestinal tract. They join around the oesophagus to form the oesophageal plexus. Question: Would damage to one vagus nerve ...
1
vote
1answer
69 views
1
vote
2answers
90 views

Extending a small fragment of DNA

Is there a way to extend a small fragment of DNA, say 150 bp, by making copies of itself and attaching each copy of that small fragment to the end of that 150 bp sequence? For example, I want a ...
0
votes
0answers
16 views

How fast could a Deinonychus run?

My 4-year-old demands to know, and we couldn't find it stated anywhere on the Web. Thanks!
7
votes
1answer
63 views

Why does the proportion of transposable elements vary so much across species?

Intuitively, transposable elements (TEs) are harmful as they may cause genome instability. However, some people argue that TEs are also sources of variations, especially regulatory sequences[1]. If ...
1
vote
1answer
51 views

How does heat generated by metabolism differ compared with heat generated through exercise?

I am from a mathematical background so I don't have much knowledge on biology. I'm building a mathematical model to predict heat generation with parameters of metabolic heat generation and exercise ...
3
votes
0answers
30 views

RAD sequencing: choosing the appropriate enzyme?

I’m studying Darwin’s finches genome and I say in some articles that the researchers used restriction enzymes to cut the DNA in their double digest RAD protocol. They are using EcoRI and MseI (GAATTC ...
0
votes
1answer
54 views

Interpretation of faint band for Linear Array HPV Genotyping Test

After having used the test for research it would appear as if it is very specific. What is one to make of bands that are there but faint? Or what if there are two bands and one is big and bold and the ...
1
vote
1answer
19 views

What would be “Sternum-Intermediate” distance?

I've asked this question on the English Language & Usage board, not being entirely sure whether this question is strictly medical, or just English knowledge suffices to answer. Do note I am no ...
1
vote
1answer
19 views

Advantage of GCPRs over RTKs or other receptor protein kinases

My book lists two important differences between GCPRs and receptor protein kinases: GCPRs do not directly activate a signal transduction pathway. It only does so indirectly, via a G protein. On the ...
1
vote
0answers
11 views

Can we take advantage of nanopore sequencing systematic errors to predict secondary structure motifs?

One of the methods of single-molecule sequencing, Nanopore sequencing, is based on traversal of DNA strand through a nanopore. Nucleotide is determined by measurement of ion current (when nucleotide ...
1
vote
0answers
34 views

Incomplete dominance with gain-of-function allele

Can somebody site an example of incomplete dominance with gain-of-function mutation?
0
votes
0answers
23 views

Does human body have a centre of mass? [migrated]

According to this site, The center of mass of the human body depends on the gender and the position of the limbs. In a standing posture, it is typically about 10 cm lower than the navel, near the ...
1
vote
2answers
34 views

Growth factors vs. mitogens

According to Campbell Biology, A growth factor is a protein released by certain cells that stimulates other cells to divide. and according to Wikipedia, A mitogen is a chemical substance ...
2
votes
3answers
232 views

Amplification technique for proteins similar to PCR for DNA?

I know PCR can be used to amplify a tiny sample of DNA in order to perform experiments. Is there a similar technique to use on a protein sample? More specifically, I'm not interested in "cutting" up ...
1
vote
0answers
127 views

How does geography affect morphological features of the human body

I've seen many times how a person born in one place, goes to another country for a long time, and then they start looking more like the people there, but I never found out how it works. This report ...
4
votes
1answer
30 views

What determines the shape of the center-surround receptive fields of retinal ganglion cells?

The wikipedia article about receptive fields of visual system tells us the following: The receptive field is often identified as the region of the retina where the action of light alters the ...
1
vote
2answers
21 views

How is e-value calculated in BLAST 2 sequences (BLAST+)?

In the BLAST+ packages, you can align two sequences instead of searching a database: tblastn -query seq1.fa -subject seq1.fa The web BLAST documentation states ...
0
votes
1answer
37 views

How do I offer a generous gift to sweet-seeking wasps, bees, hornets, bumble-bees?

I was having ice coffee and melon ice and after visiting the lavatory I saw that a wasp was having a good time with my already finished ice coffee. Trying to begin the melon ice the wasp kindly ...
3
votes
1answer
28 views

Is there any websites that provide the DNA sequences of food samples?

We can get many DNA sequences at NCBI websites for free. Is there any websites that provide the DNA sequences of food especially meat, for free? When I read papers regarding food authentication, ...
4
votes
1answer
33 views

What does “~mitochondrial DNA ~bp linear DNA” means?

I'm surfing NCBI website -Nucleotide- to find some examples of real DNA sequences to use in my small homework project. My question is related to the title of a DNA sequence below: Sus scrofa ...
2
votes
1answer
92 views

Mutation-drift equilibrium and among loci variance in heterozygosity

At mutation-drift balance, the increased heterozygosity brought by new mutations is exactly equal to the loss of heterozygosity due to genetic drift. At equilibrium, the expected heterozygosity for a ...
7
votes
3answers
85 views

Following DNA replication during S-phase of the cell-cycle, are all genomic regions subjected to the same stringent level of DNA-Repair?

To my (limited) understanding, there are 2 main ways that mutations can occur in DNA: Environmental (UV, etc) and mistakes during cell division. I was wondering if there is a mechanism that can give ...
2
votes
1answer
43 views

How much genomic variation one usually find within a given bacterial species?

If I find the exact starting position (say 1152471) of the coding sequence of a given gene in the genome of a bacterium, is the genome of the bacterium in general stable enough so that I can expect to ...
25
votes
1answer
236 views

Does this recording sound like the pulses emitted by bats?

Out of curiosity, I recorded sounds in an area with lots of bats, hoping to be able to "hear" the bats communicating by lowering the ultrasound to a level down to the frequency which can be heard by a ...
1
vote
1answer
74 views

Which bird of Upper Michigan is it?

While doing morning-walk in Keweenaw Penisula, Michigan; I found this juvenile bird wandering around looking for her mother ! Can someone spot which bird is it?
1
vote
0answers
15 views

Can one eye affect the other eye's low-light adaption?

This previous question addresses how long eyes need to adapt to darkness and reach full contrast. My question is how does one eye affect the "transition" and/or efficacy of this "night vision" of the ...
0
votes
1answer
54 views

What does NaOH do for the plating of Bacillus subtilis?

A book called Molecular Biological Methods for Bacillus called for plating Bacillus subtilis cells on LB-agar plates with the following components: A general-purpose medium containing per litre: ...
1
vote
1answer
31 views

Can galls be formed from mutualistic relationships?

According to Wikipedia, galls (cecidia) are formed by parasitic insects and mites like gall wasps (Neuroterus albipes). At some metamorphic stage, these organisms alter cell division processes in ...
3
votes
1answer
92 views

Why does Citric Acid occur in Citrus fruits?

Why is there so much citric acid in citrus fruits? And how did it evolve i.e. what did it come from? Is it a by-product of the ripening process? Why have citrus fruit evolved a particularly high ...
1
vote
1answer
29 views

How are vaccines and inoculations different? [closed]

If so are vaccinations more safe? If so how? And how is the vaccine a magical invention?
0
votes
0answers
17 views

NMDS analysis - weird plots

I ran a NMDS analysis on 16S tag sequencing data on three different 16S regions, and would like to establish the regression coefficients (R, p) from this. All the data is stored within a combination ...
0
votes
3answers
50 views

Whole Genome Sequencing and B Chromosomes

Do whole genome sequencing techniques detect B chromosomes if such chromosomes are present? My understanding is as follows: How the DNA material in a B Chromosome is mapped depends on the reference ...
1
vote
1answer
57 views

Is there a blood panel lab test that measures all the hormone-producing glands?

I understand that there are gland-specific hormone tests, such as: Secretin: for the pancreas; and Prolactin/ACTH: for the pituitary; and PTH: for the payathyroid, etc. However, are there any ...

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