• Organelles are discrete cell subunits adapted for specific functions
• Nuclei, chloroplasts, mitochondria, vesicles, ribosomes, and plasma membrane are organelles
• Cell wall, cytoskeleton, and cytoplasm are not usually considered organelles
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2
Learning objective
B2.2.2—Nucleus-cytoplasm separation
New
• The nuclear envelope protects DNA and separates transcription from translation
• Introns can be removed from pre-mRNA by RNA splicing before translation
• Nuclear pores regulate mRNA export and protein import using selective transport
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3
Learning objective
B2.2.3—Advantages of compartmentalization
New
• Compartmentalization concentrates enzymes, substrates, and suitable pH for specific reactions
• It separates incompatible biochemical processes so they can be controlled
• Lysosomes and phagolysosomes contain acidic hydrolytic digestion away from cytoplasm
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