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Basically Bcells are effective against pathogens in the body fluid, thus they maintaint immunity of an individual by producing antibodies specific to those diseases. on the otherhand T cells control the immunity amongst cells, in other words they act on pathogens that are on cells (eg. in...

i think the only question that came in the hsc about the artery, vein adn capillary dotpoint is in 2001 were they gave a image of an artery and u had to label a feature and describe how it helps in its function.

in cases of those questions were they give u a transverse view, the vessels larger in diameter would always be xylem.

hey guys just a general question when u draw or look at a cross section view of an arterty do the elastic fibres form a layer then comes a thick muscular wall or are both muscle and eastic fibres present in one layer? kinda confused about that

hmmm i think wat the examiners note meant, is that students used only ONE temperture or One pH and not a range...of temp or pH

one of these conditions means either test enzyme activity with either a change in pH or Temperature

-70% dissolved as bicarbonate ions -23% as carbaminohaemoglobin -7% dissolved in plasma. Q. Explain how mutation may result in a new generation of alleles

gene Homologue's are sequences of dna that are found in many different species of organisms Homeotic genes; are genes that control segmentation. That is they control the identity of each segement e.g whether a specific limb bud is destined to elongate & become an arm or a leg. Hox gene: are...

Beadle and Tatum carried our research on the bread mould Neurosporo Crassa. They grew the mould on a minimal medium of sugar salts and the vitamin biotin. They reasoned that these substances were converted by the mould into amino acids and that enzymeswwere reresponsible for this. They subjected...

-To overcome the shortage of donor blood -Artifical blood does not need to be cross matched making it particualary useful in emergencies -donor blood can be stored for a few weeks while Artifical blood can be stored indefinately making it again useful in emergencies Artifical blood can be...

Antibiotics are substances that destroy bacteria (bactericidal) or inhibit their growth (bacteriastatic) and hence are used to treat bacterial diseases. In recent time there has been the misuse of antibiotics such as not carrying out the full course. By not carrying out the full course acts as a...

During your study of maintaining a balance you performed an experiment to show the effect of temperature on enzyme activity. Describe the procedure you carried out. although there are many ways to perform this experiment ill mention my method: 1. A water bath of approximately 37degrees was...

this is wat i have: nuclear excision is a form of dna repair, whereby a nuclease enzyme cuts the damaged strand at two points. repair synthesis then takes place by dna polymerase and then ligase enzymes fill the remaining nick..

just want to clear up where these two hormones act...becoz different text books say different things so im kinda confused..is it safe to say ADH acts in the collecting duct AND distal tubule or just collecting duct...and does aldosterone act throughout the nephron except the collecting duct?

Re: CSSA Bio exam thoughts yeh im sure coz wen i was reading the question i underlined Red blood cells so that i dnt write all 3 forms.

Re: CSSA Bio exam thoughts hey guys i think its carbaminohaemoglobin, becoz in the question it specifically asked for the form CO2 is carried in RED BLOOD CELLs CO2 is carried in the blood in three forms: 70% dissolved as bicarbonate ions which is carried by plasma 23% as carbaminohaemoglobin...

yeh it was

yeh find the gradient of the tangent of the 2 points (0,10) and (4,8) and ull get -1/2. therefore f'(4)= -0.5

you could mention how quarantine was ineffective last year. in 2007 quarantine was blamed for the entry of the Equine influenza from japanese horses. the horses that had the horse flu viruse may not have been passed through stringent quaratine measures. the result of this is that it costed the...

ahh i get it, lol doesnt seem hard at all....thanxs dude