Zadanie 10
Chemical messages coordinate cells and whole organisms. (a) Describe bacterial quorum sensing. (b) Outline roles of calcium ions in animal-cell signalling. (c) Explain how plant hormones regulate growth through signalling.
Bacterial coordination by quorum sensing
Explain how signal concentration coordinates bacterial behaviour, including light production in Vibrio fischeri.
Tę umiejętność sprawdza 11 zadań wzorowanych na arkuszach IB z lat 2023–2026.
Zadania sprawdzające tę umiejętność: 11 Otwórz w wyszukiwarce z filtrami
Zadanie 17
A bacterial population accumulates a secreted signal as cell density rises. Once a threshold is reached, many cells activate light production together. Which process is illustrated? A. Quorum sensing B. Incomplete dominance C. Photoperiodic flowering D.…
Zadanie 17
A culture of luminous bacteria begins emitting light only after reaching a threshold cell density. What mechanism best explains this? A. Accumulated bacterial signals activate light-production genes in the bacteria B. Only one cell detects light and becomes a…
Zadanie 2b
Comment on how osmolarity affects light output.
- Materiał graficzny
Zadanie 10b
Bacteria are challenged with phages in intact or dispersed surface communities and as free cells. Error bars represent modelled ranges among replicate cultures. Suggest how properties of the surface communities could explain the survival pattern.
- Materiał graficzny
Zadanie 12
Biofilms have consequences for medicine and technology. Outline properties of biofilms.
Zadanie 11a
Define a biofilm.
- Materiał graficzny
Zadanie 11b
Suggest two factors that could affect antibiotic action on this community.
- Materiał graficzny
Zadanie 11b
Describe emergent properties of the mature community, excluding production of EPS.
- Materiał graficzny
Zadanie 13
Bacteria in a biofilm interact with neighbouring cells. State one property that can emerge from these interactions.
Zadanie 13
Bacteria in a biofilm interact with neighbouring cells. State one property that can emerge from these interactions.