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.
Chemical signalling
Umiejętności w tym dziale
Umiejętności z tego działu sprawdza 31 zadań wzorowanych na arkuszach IB z lat 2023–2026. Dział pojawia się w 17 z 54 arkuszy w bazie.
Zadania z tego działu: 31 Otwórz w wyszukiwarce z filtrami
Zadanie 17
Hormone H enters a target cell. Its receptor complex then promotes transcription, as shown. Which hormone could be H? A. Glucagon B. FSH C. Testosterone D. Insulin
- Materiał graficzny
Zadanie 17
Adrenaline binds the membrane receptor shown in a cardiac cell. Which sequence can produce an intracellular response? A. Adrenaline crosses the membrane and is converted directly into ATP B. The G protein copies the receptor gene into cyclic DNA C. Receptor…
- Materiał graficzny
Zadanie 18
Consider three possible chemical signals in an animal. I. A cytokine released by an immune cell II. A pulse of cytosolic calcium ions III. A neurotransmitter released at a synapse Which can convey information in cell signalling? A. I only B. II and III only C.…
Zadanie 5a
State which labelled molecule is the ligand.
- Materiał graficzny
Zadanie 5b
Explain how binding of epinephrine can produce a response inside this cell.
- Materiał graficzny
Zadanie 18
In this constructed dataset, exercise begins at 0 minutes and epinephrine infusion begins at 25 minutes. Which signalling event can account for the subsequent difference from the control? A. The receptor permanently destroys cyclic AMP B. A receptor activates…
- Materiał graficzny
Zadanie 9
Molecular binding underlies both communication and metabolic regulation. (a) Describe complementary molecules in cell-signalling systems, with examples. (b) Explain causes and consequences of changes to enzyme active sites. (c) Outline how reversible changes…
Zadanie 15
Which pairing correctly describes how two neuronal channels are opened? A. Nicotinic acetylcholine receptor: voltage; action-potential potassium channel: acetylcholine B. Nicotinic acetylcholine receptor: acetylcholine binding; action-potential potassium…
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.…