BIO 122 Lecture Notes - Lecture 6: Restriction Point, Metaphase, Cytokinesis
30 May 2018
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• What the extracellular matrix is and examples of ECM proteins
o Ecm, crisscrossed network surrounding cell, laminin, fibronectin, elastin, collagen
• The difference between the primary and secondary cell wall of the plant
o Primary
▪ Between newly made cells, flexible, thin, long strands of cellulose, defines
cell shape, pectins and glycans to keep cell wall moist
o Secondary
▪ Made in layers between plasma membrane and primary cell wall, after
plant cell matures
• That polysaccharides and proteoglycans function in extracellular structure and
organization
• The general types of junctions that can occur between cells or between cells and matrix
(i.e., anchoring junctions), and their basic functions
o tight junctions between adjacent cells
▪ watertight seal
▪ between animal cells
▪ adhesion
o gap junctions between adjacent cells
▪ animal cells
▪ allow small molecules to pass through
▪ communication
o adherens junctions
▪ cadherins
▪ attachment proteins link actin filaments
▪ between adjacent cells
• desmosomes that link intermediate filaments between adjacent cells
• integrins that link intracellular actin filaments to the extracellular matrix
• What basal refers to
• What luminal refers to
• That cell communication happens in all cell types
• What the four types of intercellular signaling are
• That response to a signal requires a receptor and what happens after the signal and
receptor bind together
o What are the 3 general phases of “signaling”
• What a ligand refers to
• That signals can be hydrophilic or hydrophobic and this directs where they meet their
receptor
• What the major types of cell-surface receptors are
o The basic structure of a G- protein- receptor complex
▪ The basic structure of an Receptor Tyrosine Kinase
▪ The basic structure of a ligand-gated ion channel
• What intracellular receptors are and that they interact with hydrophobic signals like
steroid hormones
• What second messengers are
• What role kinases and phosphatases have in cells
• What a kinase cascade refers to
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