anatomy Lec 1
Quiz by Thomas adly
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- Q1
Which specific structural feature allows plasmodesmata to maintain intercellular connectivity across plant cell walls?
hey are reinforced with hemicellulose
They contain a desmotubule derived from the ER.
They are coated with lignin
They form tight junctions with adjacent cells
300s - Q2
During photosynthesis in chloroplasts, where does the Calvin cycle specifically take place, and why is this location advantageous?
Thylakoid lumen; for ATP production via photolysis
Intermembrane space; for electron transport
Stroma; because it contains enzymes for carbon fixation
Grana; for efficient chlorophyll absorption
30s - Q3
Which of the following distinguishes the secondary cell wall from the primary cell wall in terms of composition and functionality?
The secondary cell wall has lignin and provides structural strength, whereas the primary wall is flexible.
The secondary cell wall contains cellulose, while the primary cell wall lacks it.
The primary cell wall is rigid and restricts expansion, unlike the secondary cell wall.
30s - Q4
The tonoplast in a plant cell serves which critical function related to the vacuole's osmotic balance?
It stores pigments that function in photosynthesis.
It stabilizes the chloroplast structure.
It prevents the exchange of ions with the cytoplasm.
It enables selective transport of solutes between the vacuole and cytoplasm.
30s - Q5
If a plant cell's Golgi bodies were experimentally inhibited, which immediate cellular dysfunction would most likely occur?
Disruption in polysaccharide secretion and cell wall formation
Accumulation of metabolic waste products
Failure in protein synthesis
Collapse of cellular respiration pathways
30s - Q6
Which cellular event is crucial for maintaining the Brownian movement observed in cytoplasmic streaming?
Motor protein interactions along the cytoskeleton
Binding of calcium ions to the cell wall
Phosphorylation of ATP molecules
Ribosomal RNA synthesis
30s - Q7
Why do etioplasts, rather than chloroplasts, develop in plants grown in the dark, and what structural component is unique to them?
Absence of photosystem II; they lack a double membrane
They develop anthocyanins for light absorption; they have no stroma
Lack of chlorophyll synthesis; they contain a prolamellar body
Inability to form thylakoid membranes; they accumulate phycoerythrin
30s - Q8
The cytoskeletal element responsible for chromosome movement during plant cell division is:
Intermediate filaments
Actin fibers
Microtubules
Microfilaments
30s - Q9
Which of the following is unique to plant cells during cytokinesis, distinguishing it from animal cell division?
Direct division of the cytoplasm without structural formation
Presence of a cell plate formed by vesicles from the Golgi apparatus
Role of actin filaments to pinch the cell membrane
Formation of a cleavage furrow
30s