Questions tagged [cell-biology]

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

Filter by
Sorted by
Tagged with
-1
votes
0answers
14 views

Are cancerous cells the secret of immortality? [duplicate]

Related to this: "Isn't biological immortality strictly speaking impossible?" Could the HeLa cells be the secret of immortality for the human race? Or is it impossible because they are cancerous ...
0
votes
0answers
8 views

Define a compliance protein [closed]

The question is basically asking for a definition, which I can't seem to find on the internet or in the article given.
0
votes
1answer
21 views

Photolysis in the Light Reactions of Photosynthesis

I'm a bit confused concerning photolysis. During the light reactions, photons are used to excite the chlorophyll molecules so they are passed to the primary electron acceptor. The electrons initially ...
0
votes
0answers
16 views

Nuclear vs Cytoplasmic Fluorescence

When staining transciption factor proteins with fluorescent antibodies (Alexa, etc.), why are the fluorescence signals stronger in the nucleus as compared to fluorescence signals in the cytoplasm (in ...
0
votes
0answers
17 views

Increasing Eumelanin Production In Body

Is there any way on how to increase the eumelanin production in your body for a longer period of time without improving pheomelanin? Thanks for your answers.
0
votes
0answers
5 views

Are (muscle) satellite cells the same as muscle stem cells?

In terms of muscle: are the terms 'satellite cell' and 'muscle stem cell' interchangeable? That is, are there muscle stem cells that are not satellite cells, or vice versa?
0
votes
1answer
22 views

Could tumor cells have normal genomic profiles?

I have thawed primary tumor cells and performed FACS. They were EpCAM positive cells. Then, I expanded them as organoids in 3D and did another FACS analysis. Again, they were EpCAM positive. I also ...
0
votes
0answers
20 views

Parthenogenesis vs. Fertilization. Is a polar body different from an egg?

In Parthenogenesis that happens by automixis "the replication of an egg by meiosis and the transformation of the haploid egg to a diploid cell occur by fusion with a polar body." =https://www....
1
vote
0answers
17 views

Eukaryotic vs. Prokaryotic genomes - Horizontal gene transfers

On page 21 of his book on cellular biology, Alberts writes that horizontal gene transfers are rare between different eukaryotic species, but fairly common between prokaryotic species. Why is this? ...
0
votes
0answers
15 views

How do microtubules bend around the nucleus?

From reading I've done microtubules tend to had a persistence length around a milimeter. If the centrosomes are next to the nucleus and the microtubules grow from there how do they connect to the side ...
0
votes
0answers
5 views

How are filopodia and membrane lengths related

I wonder how cell protrusions, in particular filopodia, form and how much of the cell membrane do they use. Is new membrane formed whenever a filopodium is created, or is the membrane simply deformed ...
2
votes
2answers
48 views

Why is sedimentation rate significant for a ribsome

When we take a look at biology textbooks (Campbell, Pearson etc), they will only mention the difference between eukaryotic and prokaryotic ribosome sedimentation rates. Why is sedimentation rate ...
2
votes
0answers
31 views

Do carrier proteins constantly open and close or do they only work when a substance binds to them?

What causes carrier proteins to change shape ? Do they need energy to change shape? If that is true, how are they involved in Facilitated diffusion ? By changing shape, do we always mean opens from ...
0
votes
1answer
38 views

Changes in dna from dioxin poisoning

A person sprayed with a dioxin, how long would it take for a dna change? Instant or over time? Would that person having children afterwards pass on any(if any) dna changes?
0
votes
0answers
19 views

Causes of iron loss without bleeding [closed]

What would cause a human to lose iron from your hemoglobin without the loss of blood? How is it possible?
0
votes
0answers
11 views

Analytical expression for negatively modulated protein expression levels

In a paper by Bashor et al., protein expression is modulated using a negative signal feedback (http://limlab.ucsf.edu/papers/pdfs/cjb_2008.pdf). I'm trying to find an analytical expression for this ...
0
votes
1answer
24 views

Is p53 a cyclin dependent kinase? [closed]

I've been reading some research papers about p53 and associated tumour suppressor proteins, such as p21. I see them referred to and associated with cyclin-dependent kinases. Is p53,p63 et cetera part ...
1
vote
0answers
37 views

Cell communication [closed]

In some organism we observe that different individual cells organize and form structures. How are these individual cells attaining the information for the grouping? How does these cells communicate?
1
vote
1answer
41 views

What are cells not affected by hormones called?

Cells that are affected by hormones are called target cells which have their own receptors that listen to signals. I'm unsure of the actual name of cells that are not affected by hormones, I tried ...
2
votes
0answers
14 views

Contrast Media for Plant cells

I currently have a waterweed (elodea) preparation for my optical microscope but i can only see some of the structures (membrane, wall, chloroplasts and the nucleus). Now I want to see more (Like the ...
1
vote
0answers
15 views

Which culture media is suitable for cheek epithelial cells?

A month ago, I tried isolating cheek cells from saliva and the experiment was a success, however, I was wondering if it is possible to cultivate these cells in vitro. I'd say it's possible, but I wasn'...
-1
votes
1answer
56 views

Why are actin filaments polarized? [closed]

I don't understand how actin filaments are polar or why they become polar. Is the plus and minus end of actin filaments what makes it polar?
2
votes
0answers
62 views

What is the relationship between cell size and metabolism?

What effect does a bigger cell have on its metabolic activity? I understand that bigger cells need more energy, but surely smaller cells may have high metabolic rates too due to their efficiency?
-1
votes
2answers
57 views

Protein rafts over the Phospholipidic bi-layer

Does any of you know the specific name of the protein rafts that allow proteins to float over a double layer of phospholipids, (cell membrane)? I just feel there should be another name rather than ...
0
votes
0answers
22 views

Are human cells tetraploid during cell division?

If human cells are diploid, and DNA replicates before cell division, does it mean that our cells are tetrapolid for a short period of time (DNA replication - cell division). Photos of chromosomes are ...
0
votes
0answers
17 views

Can damage from stress hormones/distress be reversed?

Emotional distress is said and scientifically even validated that it could contribute to earlier aging, even aside from chronological age. Stresses also can have millions of pathways in which they can ...
0
votes
0answers
18 views

Do cells of the same type fuse together with suturing?

I am reading this site: http://sciencenetlinks.com/student-teacher-sheets/cells-your-body/ "Cells that do the same job combine together to form body tissue, such as muscle, skin, or bone tissue." ...
0
votes
1answer
27 views

What are “feeder cells”?

What exactly are "feeder cells"? A paper I'm reading says they harvested the cells and then plated them onto feeder cells. What is the purpose? Is in order to promote growth?
1
vote
0answers
19 views

Why the Cell differs the structure? [duplicate]

I learned that almost every cell in an organism has the same set of DNA which is the instruction set of making protein. The protein does some function in the cell. The question is why the cells, for ...
0
votes
0answers
25 views

Is it possible to grow a part of a plant independent of the rest?

Is it possible, using modern knowledge of biochemistry and synthetic biology, to grow a tomato without growing the rest of the tomato plant? As an academic exercise, with full knowledge of the fact ...
0
votes
2answers
45 views

Name/term for mechanisms by wich the relative size/number of cells of some tissue/organ are preserved

The cells of some organ or tissue are dividing and also dies (apoptosis). But this happens in somehow controlled manner so that the total size of the organ is approximately preserved or the total ...
2
votes
1answer
69 views

Source for 'EVERY living organism uses ATP as energy carrier', and can we make a synthetic one that doesn't?

I have read it repeatedly that 'all living organisms use ATP as an energy currency etc' and 'some use GTP in addition'. However I am yet to find a reliable resource, rather than just quora/reddit/...
0
votes
1answer
42 views

“Spontaneous Immortalization”

HaCaT keratinocytes are described as "spontaneously immortalized "(see paper below) due to aneuploidy or chromosomal alteration. From the paper I get that this is a literal term, that the cells just ...
0
votes
0answers
46 views

Where is catalase produced?

I am doing a research project on the peroxisomes, and in it I referenced the enzyme catalase, which breaks down hydrogen peroxide into water and oxygen. However, the assignment asks me to specify the ...
1
vote
1answer
36 views

Glycosidation and glycosilation

I read somewhere that the function of golgi bodies is glycosylation and glycosidation. What is the difference between the two? I searched google but it gives complex answers.
0
votes
0answers
28 views

During the cleavage cycle of a zygote what determines where the blastula starts folding?

If all of the cells divide from the same zygote it seems like they should all be the same. What causes one part of the clump of cells in a blastula to start folding over to form the mesoderm and ...
1
vote
0answers
29 views

How does the glycocalyx of cells attach together if they are negatively charged?

Context Thus, the entire outside surface of the cell has a loose carbohydrate called the glycocalyx. The carbohydrate moieties attached to the outer surface of the cell has several important ...
0
votes
0answers
16 views

What is the difference between filopodia and lamellipodia?

I'm rather new to biology (I'm an applied mathematician) and I'm currently studying models of Notch-Delta dynamics between cells with filopodia and lamellipodia. What is exactly the difference ...
0
votes
0answers
15 views

what is minimal promoter and what is basal promoter?

what is minimal and basal promoter and what are their elements and what is the difference between the two?I'm confused. searched a lot, but didn't found any satisfactory answer. please help
1
vote
2answers
41 views

Does the Rayleigh formula apply to electron microscopes or only light microscopes?

I am asked to determine the resolving power of both a TEM (transmission electron microscope) and a SEM (scanning electron microscope) and given the Rayleigh formula below. $$Resolution=\frac{0.61\...
0
votes
0answers
14 views

Adipose Cellularity and Energy Intake

Is it plausible to consider increasing adipocyte size as a causal factor predicting less energy intake in humans in conditions of energy balance. It is well known that higher fat mass (FM) predicts ...
0
votes
0answers
13 views

Relation between tetrads and diploid chromosome

If diploid no is 12 In a cell , how many tetrads would be present? Please explain with diagram if possible , I am just a high school student.
1
vote
0answers
25 views

Can cell mediated immune response be transferred via blood transfusion

I read that human body can develop cell mediated immunity to viral infections and subsequently clear the virus. For example, people clear warts through cell mediated immune response against the wart ...
1
vote
0answers
341 views

What are the marker enzymes for Nucleus, Ribosomes and cell membrane?

Are there any marker enzymes present for ribosomes, nucleus and cell membrane. For mitochondria there are many, for lysosome it's cathepsin. I read about the marker enzymes of most of the other ...
2
votes
0answers
39 views

Pharmacokinetics and cell-membrane permeability of Adenosine triphosphate disodium hydrate

【My Question】 (1) Please tell me the pharmacokinetics of this ATP (or Adenosine triphosphate disodium hydrate) when it is administered orally or intravenously. In particular, Does this material has ...
0
votes
0answers
26 views

E. coli & aspartate

I am familiar with the linkage between aspartate/ligand binding, receptor methylation, and flagellar behavior re. style of locamotion, but I do not know what the bacterium does with the aspartate it ...
1
vote
1answer
38 views

Did the first cell self-replicate or was it multiple first cells? [closed]

We're almost sure by now that the first cell was born in a some kind of underwater vents environment which harvested all the necessary conditions for it to exist. However, did the first cell self-...
1
vote
0answers
57 views

Why don’t plant cells need centrioles? [duplicate]

I’ve just learned about cell division and I noted that plant cells don’t have centrioles but still undergo cell division. I’ve read a few documents about it and wondered why plant cells don't have ...
2
votes
1answer
213 views

What will happen if mitochondria had a structure like lysosomes?

I wanted to know an explanation how the structure of mitochondria affects its function. Therefore, how would it turn out if its structure is like the structure of lysosomes, what is going to happen?
0
votes
0answers
19 views

Immunological response to antibodies? Streptokinase?

Why is it not recommended to use streptokinase in the event of a second clot shortly after the first? In this graph below is an illustration on the amount of antibodies to streptokinase in the blood ...