Search found 100 matches

by Julie5
Thu Apr 28, 2011 9:53 am
Forum: Cell Biology
Topic: Quick question on genes - thanks!
Replies: 4
Views: 5623

Thank you! So, is this right - a particular sequence of contiguous coding triplet-bases (allowing for interspersed introns) that constitutes one 'end-to-end' gene (and therefore one 'end-to-end' polypeptide chain), can also be 'reassembled' in a different sequence of coding triplet bases to yield a ...
by Julie5
Thu Apr 28, 2011 9:35 am
Forum: Cell Biology
Topic: Do we know all the proteins (and their primary structure!)?
Replies: 7
Views: 8761

Do we know all the proteins (and their primary structure!)?

Again, one of those 'basic' questions that I realise I simply don't know the answer to! Do we know all the proteins in living organisms? Or even in humans? Or are there still unknown proteins whose existence we haven't realised yet? If we do know all the proteins in the (human) proteosome, do we kno...
by Julie5
Thu Apr 28, 2011 9:29 am
Forum: Cell Biology
Topic: What is the difference between chromatide and nucleotide?
Replies: 3
Views: 3894

Glad to have helped - but I'd definitely feel more comfortable if one of the experts here either confirmed or corrected my answer. I'm much more comfortable asking the questions than attempting the answers! I think I'm right on this one though, but as I say, I would await confirmation or correction ...
by Julie5
Thu Apr 28, 2011 9:21 am
Forum: Cell Biology
Topic: Quick question on genes - thanks!
Replies: 4
Views: 5623

Quick question on genes - thanks!

Hi Can I just check a couple of points please? (1) Genes are long sequences of (coding) triplet-bases. Are those triplet-bases (a) always contiguous (allowing for non-coding introns interspersed along the sequence)? Is there therefore always a point on the DNA strand that is the start of the gene, a...
by Julie5
Wed Apr 27, 2011 8:34 pm
Forum: Cell Biology
Topic: Sense/antisense - codon/anticodon - DNA/mRNA/tRNA - confused
Replies: 3
Views: 14668

Thank you both so much! So, if I can just drill 'sense is mRNA' into my skull, I can then work out in either direction (back to transcription or on to translation) what is sense/antisense in DNA and the tRNA.

Now I just have to think up a mnemonic!

Much obliged - regards, Julie
by Julie5
Wed Apr 27, 2011 7:11 pm
Forum: Cell Biology
Topic: Sense/antisense - codon/anticodon - DNA/mRNA/tRNA - confused
Replies: 3
Views: 14668

Sense/antisense - codon/anticodon - DNA/mRNA/tRNA - confused

Hi - I'm seeking clarification on the distinction between sense/anti-sense and codon/anticodon. A codon is the triplet code, and carries the sense of the gene (ie, it IS the code)(well, one amino acid thereof!) An anti-codon is the complement to the codon, and carries the anti-sense of the gene. BUT...
by Julie5
Wed Apr 27, 2011 6:55 pm
Forum: Cell Biology
Topic: What is the difference between chromatide and nucleotide?
Replies: 3
Views: 3894

Re: What is the difference between chromatide and nucleotide?

The nucleotide is the single unit of DNA comprising the sugar molecule (deoxyribose) which is bonded to the base (A/T/C/G) (this combo is the nucleoside),plus the phosphate group (which bonds the C3 carbon atom of one sugar molecule to the C5 carbon molecule of the next one along in a phospodiester ...
by Julie5
Fri Mar 11, 2011 3:07 pm
Forum: Cell Biology
Topic: Terminal Differentiation
Replies: 2
Views: 2591

Hi - I have a feeling (OK, actually dim and uncertain memory!) that they used to think they didn't, now they think they might.... Anyone know more precisely please?? Julie (I got this out of reading up on cancer, where there seems to be conflicting information about whether only the stem cells in a ...
by Julie5
Sun Jan 30, 2011 4:36 pm
Forum: Off Topic Discussion
Topic: i want to b a zoologist!!!!
Replies: 7
Views: 6358

Sakshi - yes, well, that depends on who's paying for your education, and how you are going to pay for your own keep, and your tuition, if you have to pay your own way!!! Sheep, if I'm saying what your parents are saying then they are not 'forbidding' you. They are pointing out the various alternativ...
by Julie5
Thu Jan 27, 2011 12:02 pm
Forum: Off Topic Discussion
Topic: i want to b a zoologist!!!!
Replies: 7
Views: 6358

Hi, it's always difficult knowing what to study - it's a balance between doing something you find personally interesting, and something you can make a living out of! Even if you/your parents decide that investing the time and money it will take to become a zoologist will not result in a 'decent job'...
by Julie5
Tue Dec 21, 2010 2:58 pm
Forum: Human Biology
Topic: Passive smoking
Replies: 18
Views: 21424

Nearly everyone who gets lung cancer is a smoker (whether active or passive). Hardly anyone who is not a smoker gets lung cancer. There is a famous anecdote from about 1912 of an oncologist (I can check references for you!) conducting the autopsy of a victim of lung cancer, telling his students to w...
by Julie5
Tue Dec 21, 2010 2:53 pm
Forum: Zoology Discussion
Topic: could anybody tell me what this animal is?
Replies: 3
Views: 2500

It's Felix cutissimus - no doubt about it! What a sweetie! (Don't tell me, it grows up into a ferocious monster!)

:) Julie.

(actually, don't think it is Felix...definitely a carnivore though, I'm sure of it!)