PBIO 185- Exam 1 - biomolecules & organelles
Last Modified: 2016-03-08
- Nucleic Acids- "information keepers" - store & transfer info (DNA & RNA)
- Proteins- signal molecules, facilitate reactions (most versatile)
- CHO's- fuel source, informational molecules
- Lipids- energy storage, membrane
- transcription of RNA is catalyzed by RNA polymerase
- double membrane bounded organelle
- where expression of genomic information takes place
- prokaryotic: no membrane bound nucleus
- eukaryotic: membrane-bound nucleus
- semi-permeable barrier of cell
- formed by lipids
- hydrophilic heads - "outside"
- hydrophobic tails- "inside
-provides structure & protection
-where biochemical processes (i.e. glucose metabolism etc) occur
- contains cytoskeleton: network of protein fibers (actin filaments, intermediate filaments, & microtubules
-site of fuel molecule combustion, 90% of ATP production
-site of photosynthesis
SER: processes exogenous chemicals
RER: covered with ribosomes
fuses to cell membrane & releases proteins via exocytosis
-brings in nutrients from outside of cell through endocytosis
- releases molecules that can be used as building blocks or fuel
- also digest damaged organelles
-storage of water, ions, & other nutrients
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