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1. Golgi apparatus - CORRECT ANSWER Modifies, sorts, and packages cellular
materials.
2. Lysosome - CORRECT ANSWER Acidic organelle that digests debris and
worn-out organelles.
3. Peroxisome - CORRECT ANSWER Breaks down hydrogen peroxide and
performs oxidative reactions.
4. Cytoskeleton - CORRECT ANSWER Protein network supporting shape,
movement, and organization.
5. Microfilaments - CORRECT ANSWER Thin actin fibers important for shape
and movement.
6. Intermediate filaments - CORRECT ANSWER Fibers providing mechanical
strength to cells.
,7. Microtubules - CORRECT ANSWER Tubulin structures for organization,
transport, and division.
8. Centrosome - CORRECT ANSWER Main microtubule-organizing center in
animal cells.
9. Centrioles - CORRECT ANSWER Structures in the centrosome involved in cell
division organization.
10.Phospholipid bilayer - CORRECT ANSWER Two layers with hydrophilic heads
outward and hydrophobic tails inward.
11.Hydrophilic head - CORRECT ANSWER Water-attracting phospholipid region
facing fluid.
12.Hydrophobic tail - CORRECT ANSWER Water-repelling phospholipid region
facing inward.
13.Fluid mosaic model - CORRECT ANSWER Dynamic lipid bilayer with
embedded and associated proteins.
14.Cholesterol in membranes - CORRECT ANSWER Buffers membrane fluidity
and helps stabilize the bilayer.
15.Glycoprotein - CORRECT ANSWER Membrane protein with a carbohydrate
chain; helps cell recognition.
,16.Glycolipid - CORRECT ANSWER Membrane lipid with a carbohydrate chain;
helps recognition.
17.Integral membrane protein - CORRECT ANSWER Protein embedded in the
lipid bilayer.
18.Peripheral membrane protein - CORRECT ANSWER Protein attached to a
membrane surface.
19.Channel protein - CORRECT ANSWER Forms a hydrophilic pore for selected
substances.
20.Carrier protein - CORRECT ANSWER Changes shape to move a specific
substance across a membrane.
21.Receptor protein - CORRECT ANSWER Recognizes a ligand and helps trigger
a cellular response.
22.Adhesion protein - CORRECT ANSWER Helps attach cells to each other or
their surroundings.
23.Membrane enzyme - CORRECT ANSWER Catalyzes a reaction at the
membrane.
, 24.Selective permeability factors - CORRECT ANSWER Size, polarity, charge,
lipid solubility, and transport proteins.
25.Simple diffusion - CORRECT ANSWER Small lipid-soluble molecules move
down a gradient without ATP.
26.Facilitated diffusion - CORRECT ANSWER Channels or carriers move
substances down gradients without ATP.
27.Osmosis - CORRECT ANSWER Net movement of water across a selectively
permeable membrane.
28.Primary active transport - CORRECT ANSWER Uses ATP directly to move
substances against a gradient.
29.Secondary active transport - CORRECT ANSWER Uses energy stored in an
ion gradient for coupled transport.
30.Na+/K+ ATPase - CORRECT ANSWER Uses one ATP to pump 3 Na+ out and 2
K+ in.
31.Symport - CORRECT ANSWER Coupled substances move in the same
direction.
32.Antiport - CORRECT ANSWER Coupled substances move in opposite
directions.