Cells: The Living Units Part A. 3. Cell Theory. The cell is the basic structural and functional unit of life Biochemical activities of cells are dictated by subcellular structure. Structure of a Generalized Cell. Figure 3.2. Plasma Membrane. Important for maintaining homeostasis
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K+ is released and Na+ sites are ready to bind Na+ again; the cycle repeats.
Binding of cytoplasmic Na+ to the pump protein stimulates phosphorylation by ATP.
Phosphorylation causes the protein to change its shape.
Concentration gradients of K+ and Na+
The shape change expels Na+ to the outside, and extracellular K+ binds.
Loss of phosphate restores the original conformation of the pump protein.
K+ binding triggers release of the phosphate group.
Figure 3.18a and c
Figure 3.26a, b
Cilia and Flagella
Pair of centrioles
Early mitotic spindle
Chromosome, consisting of two sister chromatids
Fragments of nuclear envelope
Contractile ring at cleavage furrow
Nuclear envelope forming
Telophase and cytokinesis