i) What is the optimum temperature for the enzyme? ii) Account for the time taken to digest egg albumen at 55°C. c.(i) In which form is the enzyme pepsin secreted (ii) Give a reason for your answer in c (i) above. d) Name two plant tissues which lack chloroplast.

Haya kelvinobenj, twende kazi. a) i) Joto bora zaidi kwa kimeng'enya hicho ni pale muda unaochukua kusaga protini ni mfupi zaidi. Kutoka kwenye grafu, muda mfupi zaidi unapatikana kwenye joto la takriban 35^ C. Joto bora zaidi: 35^ C ii) Katika 55^ C, muda unaochukua kusaga protini ya yai ni mrefu sana kwa sababu kimeng'enya (enzyme) huanza kupoteza umbo lake la asili (denaturation) kutokana na joto kali. Hii inafanya kiweze kufanya kazi kwa ufanisi mdogo au kutofanya kazi kabisa. c) i) Kimeng'enya cha pepsin hutolewa katika mfumo usiofanya kazi unaoitwa pepsinogen. ii) Pepsinogen hutolewa katika mfumo usiofanya kazi ili kuzuia kimeng'enya hicho kujisaga chenyewe tishu za tumbo zinazokitoa. Huwashwa na asidi ya hidrokloriki ndani ya tumbo. d) Tishu mbili za mimea ambazo hazina kloroplast ni: Xylem* Phloem* (Au Sclerenchyma, Root hair cells, Cork) 3 done, 2 left today. You're making progress.