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Bot I Examinations 2026 Senior Six Biology Paper One Theory

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PDF 87.83 KB 8 pages Jul 23, 2026
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Ó2026 SSEFF Page 1 of 8 NAME: ……………………………………………………. STREAM: …………………… SIGNATURE: ………………………………….... COMBINATION: …………………… P530/1 BIOLOGY PAPER 1 (THEORY) MAR. 2026 TIME:2"# HOURS BOT I EXAMINATIONS-2026 S.6 BIOLOGY PAPER ONE (Theory) 2 hours 30 minutes INSTRUCTIONS • This paper consists of two sections A and B. • Respond to all items in section A and to only two items from section B, ONE item from each part. • Responses to section A must be written in the spaces of the examination paper provided. • Use response sheets for items in section B. ADVICE • Read each item carefully before you start your response. • High quality of biology language attracts higher scores. THIS PAGE FOR SCORER’S USE ONLY Don’t write in the boxes on this page. The scorer will use them to keep a record of your scores. SECTION ITEM SCORES A 1 2 B TOTAL Ó2026 SSEFF Page 2 of 8 SECTION A Respond to all items in this section Item 1 A food poisoning outbreak was reported in Katanga village. This outbreak is traced to a bacterial toxin that destroys the tight junctions between intestinal epithelial cells. This allows the toxin to enter the bloodstream. The toxin’s mechanism is to act as a non-competitive inhibitor of succinate dehydrogenase, a vital enzyme in both Krebs cycle and respiratory chain. A table showing the systemic effects of the bacterial toxin Tissue/analyte Observed effect Underlying cause Intestinal epithelium Loss of barrier function; inflammation Destruction of tight junction Blood serum High levels of succinate Inhibition of succinate dehydrogenase Muscle cells Low ATP, cramping. Disrupted Krebs cycle and electron transport. Kidney tubules Reduced filtration rate Epithelial cells lining tubules are energy-deficient. Task (a) Explain the dual consequence of this toxin; first, how it breaches the body’s primary epithelial barrier and second, how its …
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Bot I Examinations 2026 Senior Six Biology Paper One Theory , is an educational document on StudyUganda.com. This resource includes: "Ó2026 SSEFF Page 1 of 8 NAME: ……………………………………………………. STREAM: …………………… SIGNATURE: ………………………………….... COMBINATION: …………………… P530/1 BIOLOGY PAPER 1 (THEORY) MAR. 2026 TIME:2"# HOURS BOT I ……" (Format: PDF) — 87.83 KB, 8 pages. Added July 23, 2026.

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