All Questions

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

Frogs stop croaking at same time

I know frogs start croaking at same time to attract a female, but why do they all stop at the same time?
0
votes
0answers
19 views

A question about entropy and Thermodynamics

According to the Second Law of Thermodynamics (also known as the laws of conversation of energy and mass), anything is an isolated system cannot increase in complexity. For example, a wearing suit ...
1
vote
1answer
17 views

CO2 availability in oceans and climate change impacts

I learned through research that increasing levels of atmospheric CO2 was increasing the acidity level of ocean waters. I then was looking into how this was affecting the phytoplankton and read that ...
0
votes
0answers
9 views

Can anyone explain in a simple manner what is Fourier shell correlation (FSC)? And how is the conversion from 1D to 3D FSC?

3D FSC curves are used to show directional isotropy and global resolutions in cryo-EM maps. I am having a difficulty to understand the graphs since I do not have absolute clear idea about 3D FSC and ...
-1
votes
0answers
15 views

Meiosis sexual reproduction

How many meiotic divisions are required to form- a) 400 microspores b) 400 mature megaspores? Justify your answer.
0
votes
0answers
12 views

What is the relation between “classes” (stem cell, proliferative and differentiating) and the types (Ad, Ap, B) of the spermatogonium?

Describing the question in the title further, The section, Systems Toxicologic Pathology, Dianne M. Creasy, Robert E. Chapin, in Haschek and Rousseaux's Handbook of Toxicologic Pathology (Third ...
0
votes
0answers
6 views

Does putting pandan leaves' stems in water prolong its freshness? [migrated]

I live in a tropical area where Pandanus amarylliforius is a common cooking ingredient, usually for making rice smell better, or baked into bread. We have a pandan plant in our garden, usually we ...
0
votes
0answers
17 views

ID request - some kind of mold?

Any ideas what is this? From very moldy water that was used to boil beets, the largest blob is about 34 microns in diameter.
0
votes
0answers
13 views

Is there any animal database or website that classifies animals as wild / domestic?

Is there any animal database or website that classifies animals wild / domestic? Or.. the site that I can get the wild / domestic information of animal list...
0
votes
0answers
19 views

I found bone piles in the woods. What caused them? I have photos

The bones were bleached, multiple types and sizes. Something had eaten what looks to be small frogs, snakes, fish & more. Vertebrae, jaws, etc. are identifiable. Looks to be 50-75+ individual ...
0
votes
0answers
13 views

Crickets with live babies

From what I understand of Crickets, they lay their eggs in dirt and hop away and that is their parenthood. But in the past month (since I moved into this apartment) I have found 1 adult cricket and ...
2
votes
1answer
28 views

What is this snail? (Location: Bangkok, Thailan; size: 3 cm long, 5 mm wide; color: mostly black)

What is this snail? (Location: Bangkok, Thailan; size: 3 cm long, 5 mm wide; color: mostly black) Video: https://youtu.be/vxig5QOSoss
0
votes
0answers
13 views

Adding potassium outside of neuron: Hyper- or De- polarization?

At rest, the equilibrium potential for potassium given by the Nernst equation is ~ -80mV. Since the cell is mainly permeable to potassium, this is the reason for the cell membrane's rest potential to ...
2
votes
1answer
36 views

What is the name of this insect? Is it venomous or possess any threat to human life if someone gets stung?

I found it in Northern part of India, on a mango tree. When I intended to move it away from home, it seems to bite like a snake with front part lifting like a king cobra. This insect is 6-7 inches ...
2
votes
0answers
9 views

Is this may-flowering grass an Echinochloa (barnyard grass)?

There's a grass growing in my thyme pot on my balcony, that's currently flowering (end of May, Paris region, France, southern exposure, windy conditions), and I'm wondering what species it is: Here ...
2
votes
1answer
26 views

Is hair made of protein or dead cells or both?

Some sources say hair is made of dead cells: it's mentioned in many titles of Google searches, so I'm linking the Google search search Other sources say hair is a protein filament: Protein filament ...
2
votes
1answer
35 views

what are introns in mitochondria genome?

i am studying about mitochondria genome and it is mentioned that there are introns. however, these introns encode for proteins. I cannot really understand this. Could someone tell me what intron in ...
0
votes
3answers
44 views

Does the process of making a sourdough starter involve Darwinian selection?

In essence - to make a sourdough starter: Put flour and water in a jar, and leave it in a warm place overnight Divide the remaining mixture in half, throw out half, add half as much flour and water ...
-4
votes
2answers
42 views

When is it viable to remove old graves?

Societal considerations aside, when all the remaining relatives of a particular gravesite have all disappeared or forgotten about a certain grave, is it viable/hygienic to remove or repurpose old ...
1
vote
1answer
38 views

Regarding different nucleotides on a DNA strand

I am not a biologist therefore, it might seem as an elementary question. I retrieved rodent sequences from UTR database: http://utrdb.ba.itb.cnr.it And I know there are supposed to be four ...
2
votes
1answer
26 views

Which beetle is this?

I'm curious to find out what kind of beetle this is. Google lens search suggested a type of longhorn beetle, but I am not convinced. The photo is taken in Karnataka, in India Thanks!!
-2
votes
0answers
11 views

How many meiotic divisions are required for 101 zygote [closed]

Derive the complete answer with proper explanation
-1
votes
0answers
18 views

Line Graph with Solution containing three components? [closed]

I am not sure if I am posting this query in the correct forum, so please forgive me if I've got this wrong.  I am doing a research paper into the effect of different macronutrient ratios on sleep (...
-1
votes
0answers
18 views

1. Are the heart, artery, and vein organs? If so, are the arteriole and aorta separate organs, or are they a part of an artery?

Also, are the venula and vein one organ or two? Carotid arteries, spinal artery and pulmonary artery-different organs or one? The same question about the upper and lower veins. And are the carotid ...
-2
votes
0answers
31 views

can anyone recommend me a good book specifically regarding vocalize alphabet that covering all animals? [closed]

i am looking for book that show and explain each animals alphabet words that they can speak or cant speak due to their mouth,tongue, or vocal cords, etc. i dont know the english or scientific name ...
1
vote
0answers
22 views

What insect is this? Looks like a spider but with six legs and long antennae

I've been spotting some of these insects in my house lately, they look like spiders but it seems like they have six legs and antennae instead of eight legs. Can someone tell me what insect is this? Is ...
0
votes
1answer
15 views

Difference between stem cell “expansion”, “repopulation”, and “self-renewal”?

From this paper (link:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4130805/), I read "Thus G-CSF results in the expansion of phenotypic HSCs in the bone marrow with reduced repopulating activity and ...
-2
votes
0answers
20 views

can anyone recommend me a good book specifically regarding peripheral vision that covering all animals? [closed]

i am looking for book that show and explain or covering each animals peripheral vision, including the blind spot, color that they can see, and even better if it include what it look like regarding ...
4
votes
1answer
57 views

Why do birds legs' not get frostbite?

In a nature documentary I watched a while ago, there was a scene where a flock of flamingos slept in a lake that froze overnight. Each morning they just had to wait until the lake defrosted ...
0
votes
1answer
34 views

Effect of soap on non enveloped virus survival

As i understand non envelop virus dont die of alcohol(googled) or have lipid layers to get soluble in soap micelle. Does soap remove non enveloped virus, and hand wash help in their spread?
-1
votes
0answers
49 views

Is it normal in nature for a species to get just barely enough food to eat? If so why?

It sure seems that the answer should be yes or at least the sum of starvation and death by old age and other causes like getting eaten should be equal to the birth rate. If a population is at a stable ...
-1
votes
0answers
24 views

Why isn't there T2 thyroid hormone?

The follicles in the thyroid, intake iodine and bind them onto the tyrosine rings (attached to the thyroglobulin). This produces either MIT or DIT (tyrosine rings with 1 or 2 iodines attached ...
-2
votes
0answers
7 views

Does ketosis downregulate glycolytic enzymes down to 0, especially after extended carbohydrate fasts?

(to an extent that it's one of the major reasons responsible for the body not being able to process sugar after taking cheat days)? Is there a certain set of glucose-activated promoters that are ...
-1
votes
0answers
8 views

How does the cell decide whether to burn off a fatty chain (eg omega-6 fatty acid or a saturated fatty acid) or incorporate it into its cell membrane?

We hear (e.g. doi: 10.3390/nu8030128) that the percent of omega-6 fatty acids in human fat tissue has increased over the past 5 decades due to the excess use of corn oil/soybean oil/etc. How does the ...
2
votes
1answer
26 views

What fraction of human cells gets infected during a viral infection?

As I understand, if a cell gets infected during a viral infection then it eventually dies. If an individual does not die of an infection, the percentage of cells that gets infected in the course of ...
-4
votes
0answers
55 views

Why aren't American mushrooms more diverse?

I have been puzzled by American species of mushrooms for a while. In Europe many species of mushrooms are available in supermarkets (chanterelles, ceps, craterelles, etc.). I don't often see mushrooms ...
0
votes
0answers
13 views

Why is prothrombin time used to monitor warfarin and not activated partial thromboplastin time?

Warfarin is said to change prothrombin time (PT) but not activated partial thromboplastin time (aPTT) (for practical purposes at least anyways, not really sure). But looking at the mechanism of action ...
0
votes
1answer
26 views

What causes paresthesia from compression?

Compression of a nerve causes loss of afferent and efferent information in it. What is the physiological basis of this?
1
vote
2answers
53 views

What exactly happens to hydrogen atoms in step 4 of citric acid cycle?

It seems that there are four hydrogen atoms in alpha-ketoglutarate and one in HS-CoA (not counting the ones in CoA), five in total. Two of them go to NADH and H+, so there should be three atoms in ...
1
vote
1answer
18 views

Can mutation take place in G1 and G2 phases during the cell cycle?

We know that the DNA replicates during the S phase in Interphase. There it might undergo a number of mutations. We also know that the forward half strands are more susceptible to undergoing a mutation ...
1
vote
0answers
34 views

umbrella term for microtiter plate, petri dish, cell culture flask etc

I'm looking for a term I can use in a software user interface that includes anything that may carry cell cultures or similar biological imaging samples (ie that may conceivably go into an automated ...
2
votes
1answer
50 views

How many proteins could participate in a complex

Disclaimer: I’m a computer science student with minimum knowledge of biology. I’m working on an algorithm to cluster proteins in Protein-Protein-Interaction Networks to find protein-complexes. While ...
1
vote
0answers
34 views

Profile of a human foot

I am not sure if this is the right place to ask this question, so please let me know in case it is not. My question is just out of curiosity. What is the reason for curved human foot profile? First ...
-1
votes
0answers
23 views

What is the longest straight line in the human body? [closed]

I took a drawing class and the human body seems to be made out of curves. In fact it feels like above a molecular level, there are very few straight lines in nature. Got to thinking, what is the ...
0
votes
0answers
12 views

Randomly woke up with ear ringing, what are some causes? [closed]

I got a typical cold, (runny nose, sore throat), but this time randomly during the night, I woke up with a ringing in my ear. This ringing has lasted for 2 years now. About 6 months after I was over ...
-7
votes
0answers
23 views

Can rt_pcr diagnose without any doubt covid 19

Diagnosis of COVID 19 ,no sure method diagnosis by any known method. Up till now. How do you respond to this statement?
1
vote
2answers
27 views

Histone Deacetylase Inhibition

So I am trying to brush up on my knowledge of HATs and HDACs. I am reading the just the 1st paragraph of the background of this study I remember learning that HATs turn things on on, and HDACs turn ...
1
vote
0answers
17 views

Identify this insect seen in a rural area in North India

During my stay at a village in Haryana, India, I noticed many of these grey-brown insects in my room. They spend most of their time crawling but occasionally fly too (for short distances—one metre to ...
0
votes
0answers
15 views

Why do sterile female Hymenoptera workers skew the sex ratio towards females when these females cannot reproduce?

Looking at complex societal Hymenoptera where workers are sterile and therefore cannot reproduce, why do females want other sterile worker females? It makes sense in other Hymenoptera where the ...
0
votes
0answers
17 views

Doubt related to nerve impulse transmission

Naturally, the extracellular fluid has more sodium ions and the axoplasm has more potassium ions. Since there are more potassium leakage channels than sodium leakage channels on axoplasm, it is more ...

15 30 50 per page
1
2 3 4 5
487