OCR Biology F212 (Molecules, Biodiversity, Food and Health)- 21st May 2012

The cytokine molecules have specific receptors complementary to the active site shape of B Lymphocytes.

Once they bind, it triggers the response in B Lymphocytes.

Tar destroys cilia- it coats the respiratory tract irritating it, tar also stimulates the goblet cells to produce excess mucus which cannot be removed due to the destroyed cilia. Mucus also harbours bacteria and makes the person prone to infection. This also creates the loss of elasticity of alveoli as WBC secrete enzymes to digest through the elastine (sp?) in alveoli preventing recoil of alveoli. This change in pressure causes alveoli to burst reducing the oxygen uptake into the blood

Thank you! How do properties of cellulose adapt it for its function? (3)

yes 2/3 and say that differentiates to memmory cells

Cools. I always forget to add that little detail. I always respond literally to what the question asks... grrr.

my go

WBC release elatase which destroy elastin fibres on alveoli. so bronchioles collapse trapping air in alveoli so alveoli burst as a result cannot force air in and out of lungs so breathing rate increases and causes fatigue.

Tar destroys cilia- it coats the respiratory tract irritating it, tar also stimulates the goblet cells to produce excess mucus which cannot be removed due to the destroyed cilia. Mucus also harbours bacteria and makes the person prone to infection. This also creates the loss of elasticity of alveoli as WBC secrete enzymes to digest through the elastine (sp?) in alveoli preventing recoil of alveoli. This change in pressure causes alveoli to burst reducing the oxygen uptake into the blood

Thank you! How do properties of cellulose adapt it for its function? (3)

Ah I get it, so technically if alveoli burst, surface area decreases then diffusion is slower and more difficult so blood is less easily oxygenated Other than that was it okay?

How do the free nucleotides become availiable in the first place?

They are always there surrounding DNA strand.

State the benefits of using antibiotics and growth promoters in domestic (shop) animals?

they are in the nucleus just moving here and there(better to say free)

they are in the nucleus just moving here and there(better to say free)

my go

it provides high tensile strength and rigid so prevents plant cell from bursting when kept in dilute solution. also it forms cross link so allows water and gases to be exchanged. helps in cell growth and expansion.

yup u got it and others were okay.

State the benefits of using antibiotics and growth promoters in domestic (shop) animals?

experimental work to determine tar contain carcinogens