As Paper 1 Biology Mock (2016 Paper) |37 Questions| With Correct Answers.

Q2.5 This fat substitute is a lipid. Despite being a lipid, it cannot cross the cell-surface membranes of cells lining the gut. Suggest why it cannot cross cell-surface membranes {Ans: Its too big}Q8.3 Scientists investigated the effect of different concentrations of kinesin inhibitor (KI) on mitosis of human bone-cancer cells grown in a culture Table 3 shows the scientists results A student who saw. these results concluded that any future trials of the kinesin inhibitor with people, a concentration of 100nmol dm-3 would be most appropriate to use Do these data supports the students conclusion? Give reasons for your answer {Ans: The data does support the students conclusion because at 100mol dm-3 kinesin inhibitor the percentage of diving human bone-cancer cells showing monopolar mitotic spindle was 93% suggesting only 7% of cells are still dividing and causing bone-cancer. This could suggest 100% of cells not going would be more helpful however this could be more expensive or cause side affects as the concentration is higher. Also after 1000nmol dm-3 the percentage plautoes suggesting it wouldn't be worth increasing concentration higher. Therefore supporting student conclusion}Q3.3 Figure 2 is a photograph (micrograph) of a mitochondria taken using a scanning electron