S5 ref to diffusion of, oxygen / carbon dioxide / gases ; S6 (blood carries) oxygen to tissues ; S7 haemoglobin transports oxygen ; S8 both move medium over gas exchange surface ; AVP ; 7 max S9 QWC legible text with accurate spelling, punctuation and – grammar ; 1 [10] 110. mark two columns separately first. If letter and part of cell both incorrect, look to see if the part of the cell corresponds to this letter. If so, allow 1 mark ecf function part of cell controls activities of the nucleus A cell carries out aerobic mitochondrion / D; respiration mitochondria; attaches to mRNA in ribosome(s) / rough ER / C; protein synthesis RER; produces secretory B; vesicles contains digestive lysosome(s); E; enzymes 8 [8] 111. (i) long; thin cell wall; lack of, waterproof / cuticle; large surface area; NOT if cilia / villi / microvilli / tails / etc present in large numbers; (membrane) proteins / carriers / channels / aquaporins; many mitochondria; AVP; (adaptation of part of the cell) 1 max (ii) if candidate a list or a choice, all must be correct active transport / diffusion / facilitated diffusion / described; A pinocytosis NOT passive transport / osmosis / bulk transport 1 (iii) lower water potential inside / ora; movement, down water potential gradient / from high to low Ψ Ψ; through, channel proteins / partially permeable membrane / aquaporins / AW; walls freely permeable;
S5 ref to diffusion of, oxygen / carbon dioxide / gases ; S6 (blood carries) oxygen to tissues ; S7 haemoglobin transports oxygen ; S8 both move medium over gas exchange surface ; S9 AVP ; 7 max QWC – legible text with accurate spelling, punctuation and grammar ; 1 [10] 110. mark two columns separately first. If letter and part of cell both incorrect, look to see if the part of the cell corresponds to this letter. If so, allow 1 mark ecf function part of cell controls activities of the cell nucleus A carries out aerobic respiration mitochondrion / mitochondria; D; attaches to mRNA in protein synthesis ribosome(s) / rough ER / RER; C; produces secretory vesicles B; contains digestive enzymes lysosome(s); E; 8 [8] 111. (i) long; thin cell wall; lack of, waterproof / cuticle; large surface area; NOT if cilia / villi / microvilli / tails / etc present in large numbers; (membrane) proteins / carriers / channels / aquaporins; many mitochondria; AVP; (adaptation of part of the cell) 1 max (ii) if candidate a list or a choice, all must be correct active transport / diffusion / facilitated diffusion / described; A pinocytosis NOT passive transport / osmosis / bulk transport 1 (iii) lower water potential inside / ora; movement, down water potential gradient / from high Ψ to low Ψ; through, channel proteins / partially permeable membrane / aquaporins / AW; walls freely permeable;
unit-1-answers.docx