## Search found 11 matches

Thu Mar 29, 2018 3:27 pm
Forum: Molecular Biology
Topic: DNA code
Replies: 1
Views: 6424

### DNA code

I work as a highschool teacher and I believe that in most highschool textbooks in my country there is a lost-in-translation problem involving some molecular biology basics. It has spread to the point one starts to doubt his basic knowledge, so here it goes: For example, let's say that a triplet in m...
Tue Feb 13, 2018 8:12 pm
Forum: Cell Biology
Topic: when does osmosis stop
Replies: 6
Views: 6898

### Re: when does osmosis stop

Only when water comes out and the cell shrinks... Not when water comes in and the cell starts to swell - then the membrane tension comes into play.
Tue Feb 13, 2018 6:34 pm
Forum: Cell Biology
Topic: when does osmosis stop
Replies: 6
Views: 6898

### Re: when does osmosis stop

I found this, which I think proves my point, but I cannot say i really understand all the math behind it.

https://imgur.com/a/gasXl

http://www.princeton.edu/~akosmrlj/MAE5 ... slides.pdf
Mon Feb 12, 2018 6:56 am
Forum: Cell Biology
Topic: when does osmosis stop
Replies: 6
Views: 6898

### when does osmosis stop

I have a question about osmosis that goes a bit deeper than most basic textbooks so I cannot find the answer.Here's the problem: Imagine an animal cell, say a red blood cell, in a slightly hypotonic solution. The water starts to flow in osmotically. The concentration of solute in the cell decreases....
Thu Feb 27, 2014 7:01 pm
Forum: Evolution
Replies: 7
Views: 9910

### Re:

Tricho wrote:As far as I know, they are not. In B and D there is one splitting between species 1 and 3 and 2 arised out of 3

2 did not arise out of 3. Neither of species 1,2 and 3 was created by change of one of the species 1,2 or 3.
They just have a common ancestor (node below).
Tue Feb 25, 2014 8:09 pm
Forum: Evolution
Replies: 7
Views: 9910

Here is a task: Look at the picture - you see three DNA sequences from three species that are related. Based on that sequence only, draw a cladogram that best represents their relatedness. m My thoughts: Since species 1 and 2 are the least related, and 2 and 3 most related, the corrct diagrams shoul...
Tue Apr 23, 2013 8:40 am
Forum: Cell Biology
Topic: independent assortment
Replies: 2
Views: 8543

### Re:

You're right, but the meiosis II cannot increase the diversity because it plays with given cards. Well, yes, it's much more complicated than my simplification primary reason being different rates of crossing over occuring in meiosis I in each of the cells and the fact that each of the cells is alre...
Fri Apr 12, 2013 7:28 am
Forum: Cell Biology
Topic: independent assortment
Replies: 2
Views: 8543

### independent assortment

Whenever independent assortment is mentioned, it's in the context of meiosis I. However, if crossing over occurs, sister chromatids are no longer identical so diversity should be increased during meiosis II because of independent assortment of chromosomes in metaphase II, conserning the recombinant ...
Mon Mar 28, 2011 4:46 am
Forum: Molecular Biology
Topic: cellular respiration
Replies: 2
Views: 2631

### cellular respiration

A highschool textbook says that by from one glucose molecule a cell can, first by glycolysis and then cellular respiration, gain: 36 ATP if it's a plant cell 38 if it's an animal cell I know that these numbers are theoretical maximums, in practice lower because of the protons leaking across the memb...
Wed Feb 17, 2010 9:59 am
Forum: Molecular Biology
Topic: system of DNA information storage
Replies: 2
Views: 1590

### Re: system of DNA information storage

I know abpout overlapping on the same strand because of frameshift, but I didn't find any evidence in the literature about this kind of overlap....I know when you think logically it seems even less complicated for the genome to overlap in this fashion (and maybe because of this logic authors didn't ...
Tue Feb 16, 2010 11:15 pm
Forum: Molecular Biology
Topic: system of DNA information storage
Replies: 2
Views: 1590

### system of DNA information storage

DNA has two strands. Imagine you look at one in 5'>3' direction. You get to the primer and then start codon and the coding region etc... now, when you've passed the coding region you look at the other, complementary strand (and read it in the opposite direction, for that strand also 5'>3' direction)...