The study of cells, their physiological properties, structure, environmental interaction, division, life cycle, and death, as well as the organelles they contain. Also known as cytology.

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54 views

Cellular specific mass (in grams-dry-weight per pico liter)?

What is the cellular specific mass, in units of pgDW (pico-gram dry-weight) per pL (pico liter)? I suspect there is some variability between cell types, but this variability must be limited. Perhaps ...
4
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1answer
487 views

Why is DNA double stranded and RNA single stranded? [closed]

Why is DNA present as a double helix structure and RNA as a single helix? What causes the difference between them? What are the practical physiological differences between dsDNA and ssRNA? How are the ...
6
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1answer
47 views

Is there a difference in cytoplasmic pH between prokaryotes and eukaryotes?

The cytosolic pH in human cells is around 7.4, but fluctuates as the cell is replicating. Prokaryotes and eukaryotes are vastly different in many ways. One thing they share is cytoplasm. Is there any ...
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1answer
99 views

An experiment to test if a bacterial resistance gene is on the plasmid or chromosome?

So I have an E.coli strain phenotypicall resistant to the antibiotics ampicillin and rifampicin. How do I test if the AmpR gene is carried on a plasmid and not on the chromosome? In summary, I ...
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0answers
41 views

Are there non-essential cell organelles? [closed]

Suppose an eukaryotic animal cell would have to choose to loose an organelle, akin to the voting system of the TV show Big Brother. Which organelle would be the least important to the cell and ...
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0answers
25 views

How quickly does plant cells regenerate? [closed]

This is a question from my Biology class homework? I've looked online, but I can't find the answer.
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0answers
14 views

Why do kupffer cells not attack sporozoites of malaria?

During malaria, why don't kuppfer cells (hepatic macrophages) attack the plasmodium and stop schizogony, thus saving us from the disease?
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1answer
50 views

Why does protein kinase C activated by different means have different effects?

I could be way off base but I think I remember learning that Protein Kinase C has some effects when activated by one pathway and other effects when activated by another. How does this happen? Is it ...
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1answer
28 views

Is there a way to determine how many times a given cell divided?

Do cells divide into exact duplicates? If not, is there a way to determine how many times a given cell divided?
2
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1answer
28 views

What is the name of the property of viruses can activate a second time, with different symptoms?

The Varicella zoster virus causes chickenpox in children and shingles in adults. It appears after the initial infection, it can go dormant in the nerve, and reactivate itself decades later. In ...
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0answers
40 views

What is the name of the category of viruses that affect only one side of the body?

The Varicella zoster virus causes chickenpox in children and shingles in adults. When the virus attacks as shingles, one of its distinguishing characteristics is that it only affects one side of the ...
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0answers
8 views

HSC Cycling Rates

I would like to know how often human hematopoietic stem cells go into cycle in the bone marrow niche (with a paper reference). I have heard they cycle 1-2 times per year but has anyone robustly ...
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1answer
37 views

What is the name of the property of viruses that can go dormant in the host for 30 years?

The Varicella zoster virus causes chickenpox in children and shingles in adults. It appears after the initial infection, it can go dormant in the nerve, and reactivate itself decades later. My ...
1
vote
1answer
44 views

Lookup for transporter locations in humans

I am interested in several transporters and cotransporters (eg SLC12A1/2 and many others), more precicely, in (human) organism that are made of cells containing those transporters. So does anyone know ...
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1answer
21 views

Is there a resource that has quantitative data about cell proteins?

I am a MSc student working in mathematical biology. In my thesis I am modelling diffusion of a protein that can bind to cell surface receptors. In order to simulate this I need some rough figures ...
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0answers
20 views

What is the site on an enzyme that binds either exitatory or inhibitory molecules? [closed]

A site on an enzyme where either exitatory or inhibitory molecules can bind is called a(n): A) electron transport site B) active site C) coenzyme D) metabolic pathway E) allosteric site If you ...
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1answer
17 views
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0answers
51 views

Why white Hair Turns Dark Again [closed]

I am 73 years old extremely healthy according to my blood tests and yet my hair is turning dark at the roots. I take no medications since I do not have need of any whatsoever so why this strange back ...
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1answer
40 views

Why does ESR have to be waited for one hour?

It is said that the length of the column of clear plasma in a narrow tube left by erythrocytes which gradually sediments after one hour is the measure of ESR(erythrocyte sedimentation rate). Its ...
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1answer
41 views

What's the mixture of plasma and haemoglobin called [closed]

I know of oxyhaemoglobin but the mixture of plasma and haemoglobin in the blood gives what?
0
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1answer
52 views

What's the mixture of carbon and haemoglobin called [closed]

I know of oxyhaemogloblin , the mixture of oxygen and haemoglobin , but carbon and haemoglobin combination is what's confusing
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1answer
70 views

Can soap kill cockroaches and/or ants? If so, how? [duplicate]

Is it possible to use dishwashing soap as an alternative insecticide? How would that and what are the components of the dishwashing soap that would kill the insect?
2
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1answer
39 views

Is there some research paper which focus on the influence of using cancer cell as experimental materials on experimental result? [closed]

Cancer cell is unstable cell and high variation, but there are many experiment use cancer cell as experimental materials. I always wonder how much influence can using cancer cell as experimental ...
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0answers
23 views

is there any relationship between shape of the nucleus and the function of the cell?

is there any relationship between the shape of the nucleus and the function of the cell, like in the case of leukocytes, all of them have different shapes.
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1answer
12 views

Is there one centomere for the two chromatids in a dyad? [closed]

I have no explanation for this. It is all I have to ask. Thank you
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0answers
40 views

What is plectonemic coiling? When does it uncoil?

Is it the inseparable coiling of two double stranded helices (each representing a chromatid)? In early prophase the chromosome appear as coiled filaments but in late prophase each chromosome has two ...
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0answers
11 views

Function of NEZHA gene [closed]

What is the function of NEZHA? What effect does it have on microtubules and PLEKHA7? What happens after it has been knocked down?
4
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1answer
92 views

Why it seems that principles of chemistry are not being applied in this biochemical process? [closed]

According to an answer in this question, my concept used below does not apply: In the non-cyclic photophosphorylation, consider splitting of two water molecules, then 4 e- (electrons) and 4 H+ ...
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0answers
45 views

What’s wrong with a shriveled cell?

When you place a cell into a hypotonic solution, water rushes into it and it bursts/lyses. Thus, the cell dies. However, when you place a cell into a hypertonic solution, water rushes out of it and ...
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1answer
37 views

Converting miRNA names

I need to convert all of my microRNA names e.g. hsa-miR-30e-5p to e.g. entrez gene IDs, ensemble IDs or another ID. Does anyone know a good ID conversion tool for microRNAs? (I managed to convert it ...
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1answer
57 views

How is CO2 related to acidity in plant cells?

Why does increase in concentration of CO2 in a plant cell increase the acidity of the cell sap? Thank you
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2answers
58 views

Structure of Cell

Are cells spheres or ovals/circles bound by phospholipidbilayer? If they are spherical how are we able to see the nucleus through the phospholipid bilayer under a microscope?
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0answers
25 views

mRNA extraction from mice ears.

I am trying to extract RNA from mice ears and for some reason I don't have RNA when I perform the electrophoresis. I directly cut the ears and I put it in a tube with a bead and trizol. then I place ...
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0answers
33 views

Can the activity of bacteria be influenced by magnetism? [closed]

Some organisms are tuning their direction on a magnetic field. But are bacteria also reacting on magnetic fields and can it be used in health therapie as a kind of 'antibiotic'?
3
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1answer
65 views

What do proton pump inhibitors do?

I know that sodium azide and 2,4-DNPH inhibit proton pumps. The azide is called an inhibitor and 2,4-DNP is called uncoupler. I want to know what's the difference between the mechanisms of action of ...
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1answer
99 views

What causes swelling after impact?

Why does the head swell after getting hit by something hard? What is the liquid that forms after impact?
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0answers
110 views

Why did multicellular organisms evolve when a single cell can survive on its own? [duplicate]

Since unicellular organisms can survive, why would there be evolution of multicellular organisms?
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1answer
53 views

Why did eukaryotic cells develop? [closed]

If eukaryotic cells can survive in extreme conditions, then why are their still prokaryotic organisms?
3
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1answer
63 views

Could a single cell be brought to life?

If a scientist is observing a single cell under a microscope, and then realizes that the cell has died, is it possible to bring that dead cell back to life? For my inquiry, let's assume that the ...
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0answers
30 views

Is it possible to make the human cells totipotent? [closed]

we all know humans are not capable of regenerating from a single cell. Is there any possibility that we can make cells totipotent?
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0answers
33 views

Bacteria surviving a β-lactam antibiotic

What changes can occur in the cell wall of a bacteria for it to survive a β-lactam antibiotic? I think that because a bacteria possesses peptidoglycan in its cell wall, they are β-lactam sensitive, ...
0
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0answers
21 views

What percent of cells are lysed when I make my smoothie?

This is an entirely irreverent question, but it does concern biology. I'm a physicist by training so I like to be able to estimate order of magnitude. I made a smoothie the other day with milk, ...
2
votes
1answer
59 views

ADCs: by what mechanism are antibodies internalised [closed]

I read that ADCs (Antibody-Drug Conjugates) act by a -mab for a particular target being bonded to a cytotoxic compound. From my high-school-with-crayons knowledge of antibodies, however, one part of ...
1
vote
1answer
37 views

How does symbiogenesis explain reproduction of organelles along with the cell?

Symbiogenesis is an evolutionary theory that says that prokaryotes eventually evolved into eukaryotes (having multiple organelles and better structure) by forming symbiotic relationships with other ...
2
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2answers
37 views

Diffusion coefficient of cells in blood?

What's the diffusion coefficient of white cells in blood? Is it well defined, or are cells too large and few as to be treated as particles in this context? P.S. I have tried to look this up, but what ...
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2answers
213 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
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1answer
30 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 ...
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0answers
11 views
0
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1answer
42 views

Normal cell diffusion in normal organism?

We know, that cancer cell can travel across an organism. Is this ABSOLUTELY impossible for NORMAL cells? For example, is it EXACTLY ZERO probability to find some bone cells inside liver or some skin ...
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2answers
147 views

Density of cells in human tissues?

Where can I find values, or estimates, of the density of cells in human tissues? Maybe an overall estimate, or distinct values for distinct tissues? Or maybe not human, but mammal tissues (which ...