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17 Cards in this Set
- Front
- Back
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Where does transcription occur?
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All transcription takes place in the nucleus
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Transcription
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The reading of genes in DNA by RNA polymerase to make mRNA
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What is the seretory pathway for a secreted protein?
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ER -> Gogli -> secretory vessicles -> extracellular environment
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Where does signal peptidase function?
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In the ER
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Where do trypsin and pancreatic lipase function?
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In the small intestine
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What does the interior of the ER (lumen) corresponds most closely to what compartment?
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The extracellular environment
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What is one of the main functions of the large intestine?
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Reabsorption of salt and water from forming feces
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Can steroid hormones freely diffuse through the plasma membrane?
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Yes; they are small and hydrophobic
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What is responsible for amoeboid movement of cells?
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Actin microfilaments
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Kartagener's syndrome
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Defective dynein is produced causing a paralysis of microtubule-based movement of flagellae and cilia
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What is responsible for the contraction of the cleavage furrow in mitosis?
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Microfilaments
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When does the cleavae furrow form?
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During telophase/cytokinesis
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What is the first sign of mitosis?
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The visible condensing of the chromosomes during prophase
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Can erythrocytes undergo mitosis?
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No because they are terminally differentiated and lack a nucleus in humans. They are incapable of mitosis and must be continually replenished by stem cells in the marrow
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Interphase corresponds to which phase of the cell cycle?
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G1 + S phase + G2
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When do the genomes of mitochondria and chloroplasts replicate?
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Organelles are produced during G1. Replication of organelle DNA is not coupled to replication of the nuclear genome, so it probaly occurs during G1
NOTE: only chromosomal material is replicated during S phase |
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Characteristics of fungi
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Eukaryotes
haploid for most of the life cycle Produce spores |
