All Questions

Filter by
Sorted by
Tagged with
0
votes
0answers
23 views

What kind of spider do you think is this?

This spider has been hanging around my front porch for the last few days. Just wondering what it is and if it's harmless.
0
votes
0answers
5 views

Revert lettuce to vegetative phase by cutting it down [migrated]

I have read several article stating that it is possible to revert a bolted lettuce to vegetative grow by cutting it down to 1 centimeter. Is that right?
0
votes
0answers
18 views

How do Joeys of different ages safely share a pouch?

I recently learned that female kangaroos typically rear multiple young at once, even producing different types of milk for neonatal joeys and older joeys. I've read that the older joey can enter and ...
0
votes
0answers
23 views

Dipeptide approximations for making Ramachandran plot [closed]

How did Ramachandran arrived at his plot? Did he consider only the nearest neighbor amino acids and their steric clashes? In general all those interactions in protein are electrostatic in nature which ...
20
votes
3answers
6k views

Why are sugars in whole fruits not digested the same way sugars in juice are?

In this paper of the WHO, it is claimed that we should limit our consumption of free sugars: WHO recommends a reduced intake of free sugars throughout the lifecourse. [...] Free sugars include ...
2
votes
1answer
84 views

Is it possible to detect whether an organism has been gene edited (by humans)?

Is it possible to detect whether an organism has been gene edited? For example, if someone gene-edits a human embryo (e.g., as He Jiankui did last year), can one later detect whether the human has ...
0
votes
0answers
38 views

What is that? Dry brown fungus? See photo please

It has appeared two days in a row on my balcony, at exactly the same place. There's nothing near that can give me a hint of what it is. The birds can access the place easily. It's an inch in size, it'...
2
votes
1answer
41 views

Lysozyme amino acid sequence: N-terminal extension

I looked up the amino acid sequence of lysozyme here: http://www.biology-pages.info/L/Lysozyme.html Then I crossed referenced that with the lysozyme sequence on UniProt: https://www.uniprot.org/...
0
votes
1answer
35 views

Non-coding DNA as a protection to deleterious mutations

We know that most part of our genome (at least 75 percent) is non-coding DNA. Can it be a way to protect the organism from mutations in important genes, such as the ones which control cellular cycle, ...
1
vote
2answers
77 views

Does food lose some of its mass in form of energy during metabolism?

I had an argument with someone. I argued that when a cat eats 1 kg of food, the sum of subsequent output (poo + pee + sweat + change of body mass) must be equal to 1 kg. My opponent argued that the ...
-5
votes
1answer
66 views

What separates humans from other animals?

It is clear that humans are distinguished from the other species on Earth, but what specific features are the cause? Other animals like chimpanzees have been shown to have consciousness and some self-...
0
votes
0answers
26 views

What are the consequences of less DARC expression as a result of a Duffy weak allele?

According to codegen.eu I'm a carrier of a Duffy weak allele. For SNP rs34599082 I have alleles C and T. T is a rare allele that found is less thatn ~1% of the population. Codegen.eu directs me to ...
3
votes
1answer
101 views

What are these little creatures on the fish?

I'm not a fisherman, but I just caught a cod fish (my first one) and found a lot of strange little creatures all over the fish: What are those? Are they harmful to the fish, or to the human? Edit: ...
0
votes
0answers
21 views

Isolating enzymes participating in gluconeogenesis [closed]

Is it possible to isolate enzymes participating in the gluconeogenesis? An example would be to isolate fructose bisphosphatase and phosphoglucose isomerase. If yes, how do I do that without using very ...
-2
votes
0answers
16 views

Catabolism of Triacylglycerides

Please do correct me if I'm wrong and which steps I'm missing! The order of the metabolism (catabolism) are the following: 1. Lipolysis where triacylglycerides are hydrolyzed to fatty acids and ...
3
votes
1answer
56 views

What are these two nerves running parallel to the spine called?

I was looking for a human body nervous system, and often times i found a picture like the one below, where there are two nerves running parallel to the spinal column. I searched for it, but nothing ...
1
vote
0answers
55 views

Is this a bedbug? (with picture)

I had some potentially infested clothing (and shoes) in a bathtub, and just after I bagged them to wash, I spotted this little fellow running away. I put it in a plastic food container and snapped a ...
0
votes
0answers
19 views

Can fish grow too fast?

Fish will grow faster under higher temperature, assuming enough food is provided. But can they grow too fast that it would be damaging to their long-term fitness?
0
votes
1answer
58 views

What is the Definition of Homologous Chromosomes? length, gene position are the same or similar? [duplicate]

what is the Definition of Homologous Chromosomes? this post says Homologous chromosomes are chromosome pairs (one from each parent) that are similar in length,...
4
votes
1answer
176 views

How hard would it be to create a protein “by chance”?

I just read an article about David Gelernter, who was arguing against Darwin's theory of Natural Selection. He said one particular thing which stood out to me: "...how hard it would be to create just ...
-1
votes
0answers
10 views

Cell lineage tracing, commercial products

Is anybody familiar with any companies that have commercialized the ability to trace cell lineages? In line with the following methodologies: https://news.harvard.edu/gazette/story/2018/08/genetic-...
-1
votes
0answers
41 views

Have a biology question based on human life or existence

Why must we consume life to exist. I have even read at this link (Can humans survive without consuming life?) That when cells die in our stomachs we reuse them or absorb them. Does this mean that at ...
0
votes
0answers
15 views

What is the effect of lesion of dorsal nerve root?

Dorsal nerve root or dorsal horn of the spinal cord is sensory in nature. The primary afferent neuron or secondary afferent neuron ascend via the dorsal horn of the spinal cord to form the reflex arc ...
-1
votes
0answers
39 views

What are these flies, and what are they doing? [Warning: Kinda gross]

I live in the countryside in coastal Denmark, and I have a few cats. One of them is "selectively housebroken" and sometimes poops beside the litterbox, rather than in it. He did so recently. This year,...
-1
votes
0answers
20 views

Is there an estimate of how many mammals individuals of all species together are there in the world?

According to Mammal Species of the World, 3rd Edition (Wilson and Reeder 2005), the most recent authoritative published checklist of modern mammal species there are 5,416 different species of mammals. ...
-1
votes
0answers
28 views

Is it possible for mitosis to occur in haploid (n) and triploid (3n) cells? [closed]

I understood that mitosis can occur in haploid cells and for many haploid cells it is the main process through which the cell can divide. However I'm unsure about triploid cells.
-1
votes
0answers
15 views

What is the maximum electric current a human can survive?

Many sources say that currents between 100 and 200 mA are nearly always lethal because they cause ventricular fibrillation, while higher currents cause cardiac arrest and burns but can be survived ...
0
votes
0answers
20 views

Why is Rh incompatibility not possible in Rh positive mother and Rh negative foetus? [on hold]

Why is Rh incompatibility not possible in case of Rh positive mother and Rh negative foetus ?
2
votes
0answers
21 views

Diffussion coefficient of blood

What it the diffusion coefficient of blood in, e.g. water? It is needed for microchannel length calculations I have found a bit different nubmers: 0.94 and 1.66 microns^2/ms, but not sure
-1
votes
0answers
19 views

If we could make bionic tetrachromat eyeball, Could we see four color? [closed]

I assume normally brain would receive 4 kinds of signal of 1 rod and 3 cones so, if we try to send 5 kinds of signal with bionic eye, will the brain would interpret that signal as new color?
1
vote
1answer
25 views

Which chemokines are being produced by melanocytes?

I am looking into Vitiligo it's an autoimmune disease that results in apoptosis of melanocytes due to misfolded protein accumulation. It also dramatically increases breast cancer rates (600 times) ...
-4
votes
1answer
35 views

In a Chromosome, 2 nm is the length of what?

this figure comes from the nature 2 nm at the top right hand corner is the length of what?
0
votes
0answers
16 views

How to define Bigeminy

Firstly, do cardiologists actually count how many bigeminy when they diagnose? Secondly, since bigeminy only exists when there are recurring pattern, do cardiologists count two or three bigeminy in ...
-2
votes
1answer
37 views

DNA and Genes, which consists of which? It seems that the hot answer on quora is different to the nih post

This quora's answer has got 8.3k views and 20 Upvoters. "Genes are a part of the DNA." per nih, "Genes are made up of DNA, which is telling the truth." in my understanding, the quora version ...
-1
votes
1answer
28 views

Consider gene is countable, can anyone give a concrete example of “a gene”?

gene is a countable noun but people always say genes, so what is A gene? for instance, Each chromosome contains many genes, so, which part of the chromosome of Escherichia coli could be ...
5
votes
2answers
93 views

Understanding the “Waterfall Illusion”

Motion after-effect illusions, such as the waterfall illusion, refer to illusions where fixating a screen which shows stimuli moving in a particular direction elicits the perception of motion in the ...
0
votes
0answers
23 views

How long it takes medium size dog's corpse being decomposed?

I am not a Biology student or expert. Moved the post from Pets SE. Around a month ago, my 12 years old dog passed away. And I buried her in our front yard (mostly soil, 1 meter depth, wrapped in some ...
0
votes
0answers
18 views

What species of mildew/mold grows on clothes that have been left in the washing machine? Does it vary by region?

Colloquially we say that the sour smell of damp clothes (e.g. clothes that have been left in the washing machine for too long) is due to "mildew". But from what I can find (Wikipedia), "mildew" refers ...
5
votes
1answer
73 views

What is the purpose of getting a rabies vaccine after exposure?

After exposure to the virus, it is already inside you and your immune system will start to recognize it. Is the vaccine then just a way to kickstart this process so the body can fight off the ...
7
votes
1answer
2k views

Predatory insect - what kind?

I've seen several of these insects near my house in southeast Michigan this summer, including the one seen here feeding on a green bottle fly. What are they?
2
votes
1answer
29 views

Relationship between membrane current and voltage in neurons

Depolarization of neurons leads currents of different magnitudes flow in or out of the cell, and the Sodium and Potassium currents can be separately plotted (Purves): Caption: Relationship between ...
0
votes
1answer
41 views

What are the uses of Helical Wheel Projections in Structural Biology?

I have seen helical wheel projections used to illustrate amphipathic helices in proteins. Are there any other uses for these models?
-3
votes
0answers
20 views

Most ectotherms poikilotherm, most endotherms homeotherm

Why are most endotherms, homeotherm and most ectotherms are poikilotherm?
3
votes
1answer
90 views

What Ultimately Controls DNA Transcription?

Transcription of DNA and further splicing of mRNA is regulated by various transcription factors, small nuclear RNAs and so on; similarly such related mechanisms as transposition of transposons. All ...
1
vote
1answer
39 views

Why can early embryos survive freezing?

According to this Blastocyst & Embryo Freezing in IVF Embryos can be frozen at the pronuclear stage (one cell), or at any stage after that up to and including the blastocyst stage (5-7 days ...
1
vote
1answer
34 views

How accurate are Illumina microarray chips for genotyping?

What is the error rate for these machines in genotyping (like for 23&me)? What is the chance of a false positive or false negative?
1
vote
1answer
14 views

Changes of permeability and driving force during voltage clamp

An action potential can be understood in terms of voltage changes, and these are fundamentally a function of relative permeability changes, mostly for Sodium and Potassium ions. If for instance the ...
1
vote
1answer
63 views

What is this hairy, striped orange-black caterpillar?

There are so many these hairy, striped orange-black caterpillars in my backyard. What are these caterpillars? Are these dangerous?
-4
votes
0answers
29 views

V-fib and excessive blood loss

If a man is shot right below the left side of the diaphragm and there is excessive blood loss. So can this excessive blood loss cause ventricular fibrillation? Also what is the treatment for the V-Fib?...
8
votes
4answers
158 views

Why are human feces riskier than urine with regard to spreading diseases?

I came across a Wikipedia article titled "Urine diversion". It explains different ways, including using special diversionary toilets, and treating the collection of human feces and urine separately as ...

15 30 50 per page