234 Answered Questions for the topic Cell Biology

Cell Biology Biology Database

06/26/19

Database of Multicellular and Unicellular organisms?
I'm trying to annotate a list of organisms taken from NCBI for cellularity (unicellular or multicellular). Does any of you ever found a database with association between an organisms' name or taxa... more
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06/24/19

Transmembrane Protein Problem?
A transmembrane protein has 1000 aa. The 5th aa is found on the external side of the cell membrane. It interacts with the aqueous environment outside the cell. Amino acid 90 is inside the membrane... more
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Cell Biology Biology Mitosis Embryology

06/24/19

Can 12 mitotic divisions produce 6000 nuclei?
The following quote is from "Principles of Development" by Tickle & Wolpert: "After fertilization and fusion of the sperm and egg nuclei, the zygote nucleus undergoes a series of rapid mitotic... more
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06/24/19

How to convince suspension cells to adhere more tightly?
I'm developing a cell-based assay in 96-well plates that requires adherent cells, as they need to be washed at least twice during the protocol. I'm using in-house strains of... more
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Cell Biology Biology

06/24/19

What advantage does an enzyme serve over catalysis by the addition of heat energy?
I understand that an enzyme lowers the activation energy, allowing the reaction to run faster, however I am not sure, how it may be favorable during the addition of heat energy. Wouldn't that lower... more
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06/24/19

Photosynthesis: What Powers the Splitting of Water?
The splitting of water is an endergonic (non-spontaneous) reaction, and thus would require energy (chemical work to be done) in order to happen.In Photosystem II, an enzyme catalyzes this... more
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06/24/19

How do centrioles auto-locate to opposite sides of cell during mitosis?
I realize that centrioles are made of 9 triplets of microtubulin wound together with a hollow core, and that they are responsible for the configuration of the spindle during mitosis. The spindle... more
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06/21/19

Is there a reliable estimate of the number of cells on Earth?
A quick Google search didn't turn up any reliable sources. An awkward Cosmoquest thread (https://forum.cosmoquest.org/showthread.php?141294-How-many-living-cells-are-there-on-Earth) gives a rough... more
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06/21/19

How to visualize the ECM?
Specifically, I'd like to look at changes in HA (hyaluronic acid) production. Most often you only see people staining the cell surface or removing cells from culture for fixation and then imaging.... more
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06/21/19

Using ion-exchange chromatography to purify DNA from a cell extract - Is DNA more negatively charged then RNA?
When applying this method we have a glass or plastic column of resin which is positively charged. Then we pour cell extract into the column in order to capture the negatively charged particles... more
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06/20/19

How are the physiological properties of mitochondria measured?
This is my first question on BiologySE. I am a Physics and Mathematics student currently doing a project on cell growth simulation. I am doing literature survey and I have a question about cellular... more
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06/20/19

Significance of lipids in biological membranes...?
Membranes are specifically designed by lipids to maintain internal hydrophilic environment in narrow range.There are hydrophobic amino acids among naturally occurring 20 amino acids and as well as... more
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Cell Biology Biology Electrophysiology

06/20/19

Connect the inner and outer space of cell with a wire, will there be electricity?
There is a potential difference, but ions can not go through wires, right? Though there is a electric field, but there is no electron source, I am thinking the answer is no, or will there be some... more
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Cell Biology Biology Meiosis Mitosis

06/20/19

Coiling of chromatids during cell division?
What is exactly coiling of chromosomes?I just heard about the names i.e paranemic, plectonemic, orthostichious, anorthospiral.I have ecaxtly no idea of what phenomenon is this.Also what type of... more
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Cell Biology Biology Human Biology

06/20/19

What kinds of cells does human saliva contain?
I have heard that our saliva contains cells. What cell types can be found in human saliva?
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Cell Biology Biology Synthetic Biology

06/19/19

Creating a cell, not from another cell. Will it be possible?
If some time in the future, we can know exactly what a cell (for example simple prokaryote bacteria) contains, (I mean, exactly which molecules, the shape of them, the density of each, everything),... more
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Cell Biology Biology

06/19/19

Are there differing organelle to cytoplasm ratio in animal cells?
Could anyone provide me with examples of cells with high organelle to cytoplasm ratios (heavily packed), and examples of cells with low organelle to cytoplasm ratios (sparsely packed)?
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Cell Biology Biology Histology

06/19/19

Significance of basal lamina for outer layers of epithelium?
In stratified (not pseudostratified) epithelia such as the epidermis, what purpose does the basal lamina serve for the outer layer cells which do not even stand in contact with it?Also, how do... more
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06/19/19

Can/Have cancer cells be/been used in stem cell culture lines?
Since Cancer cells have unlimited growth potential, can they be induced towards totipotency and pluripotency? If so, can cancer cells be used in stem cell culture because of similar properties of... more
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06/18/19

Can general soap kill bacteria?
I have read that general soap can kill bacteria by opening holes in the bacterial membrane.http://questions.sci-toys.com/node/90However, I found some articles as well saying that it... more
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Cell Biology Biology

06/18/19

What plastic eating organisms are there to help with plastic in landfills problem?
I see some popular science articles on the plastic eating bacteria and fungi appearing on the web since 2009. Most of the articles praise discoveries, because such organisms promise to break down... more
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Cell Biology Biology Hearing

06/17/19

Is the ringing sound in the ears caused by dying ear cells?
I was recently watching the movie "Children of Men" (great movie) by Alfonso Cuarón. Now in a certain scene, the lead actor happens to be nearby a loud explosion. Later, when he complains about the... more
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Cell Biology Biology Botany Enzymes

06/17/19

Do plants have cellulases?
I can't seem to find the answer to this. Not even Wikipedia could help- it mentioned bacteria and fungi that have cellulases but not plants. Using my own reasoning, I would think that - On the one... more
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06/16/19

How does water buffer a sudden drop in temperature?
A property of water is that it is slow to heat and cool. According to my biology book, some energy from an increase in temperature would spent breaking hydrogen bonds, so that temperature does not... more
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Cell Biology Biology

06/15/19

Is cell wall and cytoplasm an organelle?
So cell wall is an organelle? Whereas, it is not a membrane-closed organelle?Cytoplasm is an organelle? Whereas, it is not a membrane-closed organelle?
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