Search found 79 matches

by kk
Sun Jan 27, 2019 6:47 pm
Forum: Cell Biology
Topic: Inclusion body vs. storage granule vs. residual body vs. vacuole
Replies: 0
Views: 738

Inclusion body vs. storage granule vs. residual body vs. vacuole

Someone please explain me the difference between the aforementioned organelles, e.g. which ones are membrane enclosed, exclusive to prokaryotes or eukaryotes. I came across the expression "unit membrane" in regards to this problem, what does that mean?
by kk
Sun Jan 27, 2019 6:43 pm
Forum: Cell Biology
Topic: Why cardiac muscle cells sometimes have more than one nucleus?
Replies: 0
Views: 704

Why cardiac muscle cells sometimes have more than one nucleus?

What mechanism causes heart muscle cells occasionally to have multiple nuclei? Is that the same blast-fusion mechanism that forms syncytium of skeletal muscle cells? And the same question goes for all multinucleated cells in the human...
by kk
Sun Jan 27, 2019 6:39 pm
Forum: Microbiology
Topic: Invasion of a host cell by a DNA virus
Replies: 2
Views: 19508

Re: Invasion of a host cell by a DNA virus

Related question:

I've read the word somewhere "pulverisation" to describe degradation of host DNA upon exposure of viral nucleic acid, but when and how does that happen? Is that an accepted and a well established technical term?
by kk
Sun Jan 27, 2019 6:22 pm
Forum: Cell Biology
Topic: Compare and Contrast Active and Passive Transport?
Replies: 7
Views: 18143

Re: Compare and Contrast Active and Passive Transport?

"active transport does not have to go against conc. gradient, theoretically." My question is related to that: In action potential, right after depolarization, does Na+/K+ pump keep moving sodium out and potassium in? Than it would move those ions down their gradient (!?), still at the expense of ATP...
by kk
Tue Nov 20, 2018 9:25 am
Forum: Botany Discussion
Topic: light dependent reaction on photosynthesis
Replies: 8
Views: 16308

Re: light dependent reaction on photosynthesis

Cyclic photophosphorylation vs. Non-cyclic photophosphorylation Which organisms use which mechanism? I've been looking for the answer but couldn't find a reliable one, most answers are very vague. If the organism has both PSI and PSII, it can readily switch between cyclic and non-cyclic, depending o...
by kk
Tue Apr 17, 2018 8:12 pm
Forum: Cell Biology
Topic: Fermentation in the human body
Replies: 2
Views: 3602

Re: Fermentation in the human body

I'm still keen to know more, please.
by kk
Thu Feb 15, 2018 7:50 pm
Forum: Genetics
Topic: What is the roan cattle and the Jappanese four o'clock ???
Replies: 3
Views: 7077

Re: What is the roan cattle and the Jappanese four o'clock ???

I thought roan meant two two hair colors are expressed simultaneously (e.g. black and white hair), instead of grey hair. But then I wouldn't understand, each heterozygous cell would grow multiple hairs? Just don't get it...
by kk
Mon Jan 29, 2018 10:27 am
Forum: Cell Biology
Topic: Fermentation in the human body
Replies: 2
Views: 3602

Fermentation in the human body

I know that lactic acid fermentation is possible in muscle cells and mature red blood cells. My questions would be 1) all muscle cell types are able to perform lactic acid fermentation? 2) is there any other type of fermentation that a human cell (!) is able to perform in the body?
by kk
Sun Jan 28, 2018 3:23 pm
Forum: Cell Biology
Topic: Will we make more ATPs when inhaling pure oxygen?
Replies: 0
Views: 2388

Will we make more ATPs when inhaling pure oxygen?

Will that boost ATP production in mitochondria? Or other reactions are rate limiting?
by kk
Fri Jan 26, 2018 9:54 am
Forum: Cell Biology
Topic: Where are enzymes in the smooth endoplasmic retuculum synthesized?
Replies: 0
Views: 2329

Where are enzymes in the smooth endoplasmic retuculum synthesized?

Are they produced by RER-bound ribosomes or by free ribosomes and later they get imported into the SER. Also, how does the ER separate enzymes that work in the RER (e.g. glycosylases) from enzymes that work in the SER (e.g. detoxifying enzymes)? I know sometimes the ER is "mixed" so could be conside...
by kk
Wed Jul 27, 2016 8:54 am
Forum: Genetics
Topic: CpG methylation
Replies: 1
Views: 2583

CpG methylation

When people talk about DNA methylation at CpG sites, I keep seeing CpG spelled out as "cytosine-phosphorothioate-guanine"... isn't it all wrong? I thought CpG just means a cytosine and a guanine containing deoxyribonucleotide bonded with a normal phosphodiester bond, and "p" just...
by kk
Tue May 31, 2016 8:50 am
Forum: Molecular Biology
Topic: How to determine "zygosity" for a particular mutation?
Replies: 0
Views: 1971

How to determine "zygosity" for a particular mutation?

If two point (base substitution) mutations were detected adjacent to each other (by pyrosequencing), how do I know whether they were really next to each other in the same dsDNA molecule or one was present in the paternal dsDNA and the other in the maternal dsDNA?