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Lichens can reproduce sexually and asexually. Sexual reproduction involves
meiosis and asexual reproduction involves mitosis.
Suggest advantages to lichens of being able to reproduce both sexually and
asexually.
_
The abundance of lichen on the walls of this building can be measured by
determining the percentage cover of lichen.
Suggest how the percentage cover of lichen could be determined.
_
Explain how light intensity could be measured at the surface of the wall.
_
Suggest how the data collected could be used to show whether there is a
relationship between the abundance of lichen and light intensity.
_
Name the enzyme involved in carbon fixation.
_
Explain how forest fires may lead to global warming
_
Explain why the use of biofuels may help to reduce global warming.
_
Explain one disadvantage of using biofuels to reduce global warming
_
Explain how the amino acids are joined together in a polypeptide.
_
Bacteria and viruses can cause human diseases.
(a) Distinguish between the structure of bacteria and viruses
_
Infection with a bacterium can result in the development of active immunity to
that bacterium. This results in the production of antibodies by plasma cells.
(i) Describe how infection with a bacterium results in the production of plasma
cells.
_
Explain how antibodies help a person to recover from an infection.
_
Eating food that is contaminated with microorganisms can cause food poisoning.
(a) Not all contaminated food causes food poisoning. Suggest explanations for this.
_
The norovirus causes a type of food poisoning, commonly called stomach flu.
Norovirus is a non-enveloped RNA virus.
The virus stays in the small intestine and causes symptoms approximately
24 hours after eating the contaminated food.
Stomach flu can be caused by eating food containing as few as 20 viral particles.
(i) Suggest how new viral particles are formed inside the host cells.
_
Suggest why so few viral particles are enough to cause symptoms after
24 hours.
_
The risk of transmitting food poisoning microorganisms can often be reduced
by using alcohol-based handwashes.
Suggest why alcohol-based handwashes do not reduce transmission of the
norovirus.
_
Explain the meaning of the term species.
_
- Blankets the investigation of all the living creatures and their collaborations into the biosphere.
Additionally, research the natural elements that encompass the living creatures; and, by method for moderation, it looks for more viable approaches to comprehend the varieties or new states of the environment that can debilitate the presence of living creatures on our planet.
_
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Source:
http://www.ccny.cuny.edu/biology/images/biologybanner.jpg
http://pastpapers.edexcel.com/content/dam/pdf/A%20Level/Biology/2013/Question%20papers%20and%20mark%20schemes/6BI04_01R_que_20130611.pdf
http://www.ccny.cuny.edu/biology/images/biologybanner.jpg
http://pastpapers.edexcel.com/content/dam/pdf/A%20Level/Biology/2013/Question%20papers%20and%20mark%20schemes/6BI04_01R_que_20130611.pdf
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