By Steve Potter
Speedy revision notes for AS, with self-check questions and grade-boosting tutorials in a convenient A5-sized ebook. Written by way of a senior examiner and skilled instructor who understands what scholars desire for that ultimate -- rapid -- check!Ready made revision notes conceal the total of the AS path and slash on revision time. Self fee questions at each level verify revision is energetic and potent. Grade-boosting tutorials from the examiner offer professional suggestion on tips to solution examination questions and what pitfalls to prevent.
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0 Time/min 39 G AS E XCHANGE (2) The amount of air breathed in/out per minute is the pulmonary ventilation. Pulmonary ventilation = tidal volume (volume per breath) × rate of breathing Gas exchange in the alveoli In the alveoli, oxygen and carbon dioxide diffuse in opposite directions down concentration gradients. These gradients are maintained by: ● circulation of blood – as blood around an alveolus becomes more oxygenated, it is moved on and replaced by deoxygenated blood; ● ventilation – as the air in the alveolus loses oxygen (and gains CO2), it is replaced with air high in oxygen and low in CO2.
As well as with .............. The second strand is .............. to the original single strand and the two are held together by .............. bonds. (6) 3 Explain the benefits of dividing the culture of bacteria in a fermenter into a multiplication phase and one of production. (3) 4 (a) In the polymerase chain reaction, explain the benefit of using a thermostable DNA polymerase and DNA primers. (5) (b) What is the use of the PCR in genetic fingerprinting? (2) (c) How much DNA would be produced from 8 molecules in 6 cycles of the PCR?
Inspiration starts, stimulating stretch receptors in the thorax wall. 2 Stretch receptors send inhibitory impulses to the inspiratory centre, reducing the number of impulses to the intercostal muscles and diaphragm. 4 Expiration occurs passively. Stretch receptors send fewer and fewer inhibitory impulses: at the end of expiration, inhibition of the inspiratory centre is removed. 3 Inhibition of the inspiratory centre increases as inspiration gets deeper. Eventually, no impulses are sent to the intercostal muscles and diaphragm and further inspiration is prevented.
AS Biology (Instant Revision) by Steve Potter