09/13/23

In what sense is rank-based taxonomy an objective attempt to characterize a truth of the natural universe, and in what sense is it based on subjective decisions by the people doing the classification?
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08/16/22

Question about Malaria & RBCs (Biology)
Dear experts,I have a question about a biology topic... So, i wanted to understand how do malaria paracites multiply in RedBloodCells (RBCs), these cells have no nucleus so they can't transcribe... more
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08/14/22

Patients are frequently given instructions to avoid allergy medications for a period of time prior to allergy testing. Why would this be important?
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12/09/20

What are the two major mechanisms through which cell signaling leads to a change in cell behavior?
What are the two major mechanisms through which cell signaling leads to a change in cell behavior?
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05/30/20

Will the Tasmanian devil species be more susceptible to the new diseases after 1996's DFTD outbreak there?
How the huge reduction of the Tasmanian devil population since 1996 affects the susceptibility of the current population to new diseases in comparison with the susceptibility of the population... more
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05/30/20

n acetylglutamate allosteric activator of which enzyme of the urea cycle?
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05/27/20

i need help please
do you think that organisms/species will become more different from each other over time? Or more similar? Explain your reasoning. 
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07/11/19

Difference between protozoa, protists, protoctista?
Are protozoa, protists, protoctista different classes of organisms or simply different names for the same?
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06/30/19

Why doesn't surgical steel cause inflammation?
It seems some very specific alloys like implant surgical steel and titanium don't cause inflammation in the human body, but when I asked my doctor about it, they simply said "it just has some... more
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06/30/19

What are the different ways an exon gets spliced?
Exons are produced by more than one mechanism, e.g. splicing out introns after transcription, if I remember correctly. Please list all mechanisms.
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06/28/19

Is there a database of cell images?
We're working on an algorithm for processing images of cells, similar to but much more basic than [Cell Profiler](http://www.cellprofiler.org/), and we are looking for a large database of cell... 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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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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06/19/19

The optic nerve is derived from what embryonic tissue?
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06/18/19

Why do Humans not produce Vitamin C like other mammals?
Why do most mammals produce their own Vitamin C? Why do Humans not?
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06/18/19

Name macromolecules synthesized during S phase of cell cycle.
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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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06/17/19

We always say that enzymes are very specific to their substrates, then DNA polymerase can utilize all 4 types of nucleotides as substrates. to which substrate the DNA polymerase is specific?
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06/17/19

Why are proteins always made in N to C direction?​?
Why are proteins always synthesized from the *N*-terminus to the *C*-terminus? Can there be any “reverse” peptide-bond formation to synthesize proteins in the *C*-terminal to the *N*-terminal... more
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06/17/19

Role of calcium chloride during competent cell preparation?
I am aware of the fact that $CaCl_2$ settles down on the cell wall making it less negative may be by forming bond with Teichoic acid. Also due to the positive charge it attracts DNA (DNA is... more
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06/16/19

Why do people have antibodies against other blood types?
The ABO blood type divides each blood type according to whether they have the "A" and "B" antigen(s) (AB has both, O has none). People also have antibodies against the antigens they don't have (AB... more
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06/12/19

Cytokine responsiveness?
Why is it that cytokine responsiveness is less in progenitor cells than their ancestors(stem cells)? What will be the benefit of such reduction in responsiveness?
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06/11/19

Where do all the NAD+s come from?
In the mitochondrial respiration (of plant cells) NADH is reduced from Nad+ as part of the TCA (converting malate to oxaleoacetate). But where do the NAD+s come from? The TCA cycle is working even... more
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06/05/19

How much time does it take for the naive T Cell to get activated?
Suppose a naive T cell comes in contact with an APC. How much time does it take for the T Cell to get activated and within how much time does the T cell move away from the APC due to... more
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