Biochemistry/Microbiology Challenge Question.

[Survivor39]

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For biochemistry lover:

1. After vigorous excercise or running, why do you tend to stop and cannot continue? Answer from a biochemical perspective. (hint: What happens in your metabolism?)


For microbiology lover:

2. Why do you add lemon to seafood?

3. How do antibiotics work? How do they target bacteria but not human cells??


For anatomy lover:

4. How many layers made up your skin (epidermis)? Does this also means when you undergo abrasion from daily activity, living cells are being sloughed off? Explain.

[+Po1ntDeXt3r+]

i wont spoil it
hehe they were interesting.. i did them from memory.. and its late..
so they arent right

are we talkin lactic acid build up.. and all that hoo-ha from the krebs cycle etc?

umm acidity/pH is the main defence in ure innate immunity ... why not on ure food ?.. it hides the fishy taste and does sumfing to certain parts of the bacterial wall causing cellular damage.. ..

antibiotics - 3 things.. i kno this one.. off by heart.. cell wall integrity, protein synthesis and DNA replication.. and human cells dun have cell walls of pepticoglycan ( or any actualli) ..

sigh.. stratified squamous epithelium.. cant realli say tats a layer.. sorri.. but wat do u mean? all i can think is epidermis with a dermis under that...
yes it sloughes off and its a component of dust

[Survivor39]

Dammit point! they are meant for HSC biololgy people :P

[Survivor39]

LOL. I just read your answers point. It's not bad, but it just shows that science students actually learn more science than med students. But then again, you guys are focusing more on patient relationship and stuff. That's why I chose science. I actually WANT to learn science!

Note to point:
Stratified squamous epithelium is not a layer. It is simply a classification of types of epithelium e.g simple columnar/squamous/cuboidal. I am asking for the layers of the epidermis. But I won't spoil the fun for bright HSC biology students. I'll give out the answers later.

[+Po1ntDeXt3r+]

actualli the worse part is tat ive completed accelerated 3rd yr mircobio and immuno recently.. im in both med and sci :P dun start me.. the number of all those damn interleukins to activate T helper 1,2 cells are still tattooed to my head .

//edit: i get ure werid ass question... tats a lil obscure for me even... ure as confusin as my immunology tutor...

[+Po1ntDeXt3r+]

OMG i kno wat u meant.. S.C ,S.L ,S.Gran, S.S, S.Ger ... cmon.. tats hard to remember let alone yr 12 kids!? unless their parents are dermatologist.. havent talked about those since med bio bridging :S in yr 1!

[Survivor39]

blah med people My anatomy question wasn't confusing... May be you should have had more histology lectures

Yes you're right. actually.... thick and thin skin are different. Those layers were thick skin layers. Thin skin does not have S.L.

Ok enough of you... I'm sure some bright year 12 people will know it.

[suger_plum]

Why Do You Add Lemon To Seafood?

[+Po1ntDeXt3r+]

I kno but i was afraid if i forgot to mention S.L ud accuse me of dumbing down science :P technically u didnt ask about thick or thin... so i answered assuming the layers of epidermis

Ok i well say they are good questions..
Oh Heres a question ...

this is more Medical.. sorry its interesting and bio-y.. should be easier

If you have low oxygen you get a condition called cyanosis where ure lips and stuff (like fingers or toes) turn blue.
Why is it in anaemia you look pale (and everything looks pale) and not blue, when anaemia is about low oxygen to tissue too?

[Survivor39]

Originally Posted by +Po1ntDeXt3r+

I kno but i was afraid if i forgot to mention S.L ud accuse me of dumbing down science :P technically u didnt ask about thick or thin... so i answered assuming the layers of epidermis

whatever And plus I didn't ask for names of each layer. I just asked how many. And whether living cells are rubbed off from daily activity.

Originally Posted by +Po1ntDeXt3r+

Ok i well say they are good questions..

Thanks

Originally Posted by +Po1ntDeXt3r+

this is more Medical.. sorry its interesting and bio-y.. should be easier

If you have low oxygen you get a condition called cyanosis where ure lips and stuff (like fingers or toes) turn blue.
Why is it in anaemia you look pale (and everything looks pale) and not blue, when anaemia is about low oxygen to tissue too?

Hey! This is not the medical forum! :P

anyway. The only thing i can think of is anaemia is a result of lack of the number of circulating RBC. Hence you look pale.
Whereas in cyanosis is due to the lack of oxygen in RBC, causing blue colour because of deoxygenated blood.

[Survivor39]

Originally Posted by suger_plum

Why Do You Add Lemon To Seafood?

Hint: remember your biology practical on enzyme activity? What happens to the enzyme activity when you alter the pH?


Did I practically gave the answer away?!!

[Survivor39]

Oh point, lactic acid don't derive from kreb cycle *coughs* It's from the products of glycolysis - pyruvate.

[nit]

haha, one semester of concepts in biology 1001 and I'm on my way to becoming biologist! Hmm, yeh lactic acid results from the fermentation of pyruvate mainly in animal cells. That whole cycling idea of NAD while producing ATP is really neat. Talk about efficiency.

[+Po1ntDeXt3r+]

Originally Posted by Survivor39

Oh point, lactic acid don't derive from kreb cycle *coughs* It's from the products of glycolysis - pyruvate.

Ok.. i forgot.. srsly.. goto love the stuff i forgot lolz.. Wait Heart=left?!

technically ure answer isnt right in terms of haemodynamics.. cos there is more than one reason for anaemia but thats the gist ...
the fun part is the histo/path of haematology

[Survivor39]

Originally Posted by +Po1ntDeXt3r+

technically ure answer isnt right in terms of haemodynamics.. cos there is more than one reason for anaemia but thats the gist ...
the fun part is the histo/path of haematology

gee. so picky. I only answered your question as well as you answered mine, remember?? lol


histo rocks, except I might have screwed up my spot test !
path sucks. not planning to do it next semester. it's just like histo + diseases. i think i had enough memorising already with histo...