Search found 10 matches

by red.ninja13
Sat Apr 11, 2009 12:59 pm
Forum: General Discussion
Topic: Hypothesis
Replies: 1
Views: 1436

Hypothesis

I have conducted an experiment using spearmans rank. since my critical value was greater then my resulting ''rs'' number, i have to accept the null hypothesis.

Does this mean i have to totally reject my hypothesis, and cant comment on any biological information to support it?
by red.ninja13
Sun Mar 22, 2009 7:39 pm
Forum: Human Biology
Topic: Caffeine Coursework
Replies: 3
Views: 10006

Re: Caffeine Coursework

Thanks for your help. i am trying to do section on biological info, and i just dont understand this passage from wikipedia, can anyone explain it to me? "Caffeine's principal mode of action is as an antagonist of adenosine receptors in the brain. Like alcohol and nicotine, caffeine readily cros...
by red.ninja13
Mon Mar 16, 2009 12:32 am
Forum: Human Biology
Topic: cardio vascular/ circulatory diseases/problems
Replies: 1
Views: 1891

cardio vascular/ circulatory diseases/problems

are they effected by caffeine?
by red.ninja13
Sun Mar 15, 2009 11:34 pm
Forum: Human Biology
Topic: Caffeine Coursework
Replies: 3
Views: 10006

Caffeine Coursework

Hi i am doing my A2 Coursework on the effect of caffeine on reaction speed and short term memory. I am going to give my "test subjects" ProPlus tablets, the tablet packet states that you shouldnt take more then 2 tablets in 3 hours (100mg) however, having researched caffeine, i believe tha...
by red.ninja13
Mon Mar 17, 2008 10:19 am
Forum: Molecular Biology
Topic: Competitive/Non competitive inhibitors
Replies: 5
Views: 15941

Competitive/Non competitive inhibitors

I am trying to do coursework, on whether a chemical is a competitive or an non competitive inhibitor of amylase. Only problem is, i don't know what chemical i should use. Can any1 suggest a chemical that will be easily available in a school lab, i have tried googling it, but it keeps coming up with ...
by red.ninja13
Sat Oct 27, 2007 4:58 pm
Forum: Cell Biology
Topic: notes about tissues and the cells
Replies: 8
Views: 4896

so they are not anything to do with skeletal muscle tissue?
by red.ninja13
Thu Oct 25, 2007 11:29 pm
Forum: Cell Biology
Topic: notes about tissues and the cells
Replies: 8
Views: 4896

in my text, it has the heading muscle tissue, and bullet points visceral muscle, skeletal muscle, cardiac muscle. inbetween skeletal and cardiac, there is a paragraph saying 'adaptations of palisade mesophyll cells' and starts going on about chloroplasts. 1. what is a palisade mesophyll cell 2. they...
by red.ninja13
Thu Oct 25, 2007 11:16 pm
Forum: Cell Biology
Topic: please help me - a level
Replies: 2
Views: 2662

lets see if i'v got this correct........ 1mm = 1000µm if 1 stage unit = 0.01mm and 3 graticule units = 1 stage unit 3g = 10µm 1g = 10∕3 1g = 3.33µm 3g = 0.01mm 1g = 0.01∕3 1g = 0.0033mm so could i use the equation n g = n s 1g = n / n then times by 100 to get µm have i got it?
by red.ninja13
Wed Oct 24, 2007 9:51 pm
Forum: Cell Biology
Topic: please help me - a level
Replies: 2
Views: 2662

please help me - a level

im doing a learn at home a level in biology (aqa spec b), and theres one part i cant make any sense of, no matter where i look on the net, and as i am doing it learn at home i have no access to microscopes or anything. i dont understand how to do calculations when looking at stuff through a graticul...
by red.ninja13
Wed Oct 24, 2007 9:31 pm
Forum: Cell Biology
Topic: notes about tissues and the cells
Replies: 8
Views: 4896

the mainly 4 tissues : 1) epthelial : is the layer covering or lining the surfaces of structures,divided into simple & stratified 2) Connective :holds structures or other tissues together (bone, cartilage,blood) 3) Musclar :form types of muscle as containing contractile filaments 4 ) Nervous :f...