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17 Cards in this Set

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Where does transcription occur?
All transcription takes place in the nucleus
Transcription
The reading of genes in DNA by RNA polymerase to make mRNA
What is the seretory pathway for a secreted protein?
ER -> Gogli -> secretory vessicles -> extracellular environment
Where does signal peptidase function?
In the ER
Where do trypsin and pancreatic lipase function?
In the small intestine
What does the interior of the ER (lumen) corresponds most closely to what compartment?
The extracellular environment
What is one of the main functions of the large intestine?
Reabsorption of salt and water from forming feces
Can steroid hormones freely diffuse through the plasma membrane?
Yes; they are small and hydrophobic
What is responsible for amoeboid movement of cells?
Actin microfilaments
Kartagener's syndrome
Defective dynein is produced causing a paralysis of microtubule-based movement of flagellae and cilia
What is responsible for the contraction of the cleavage furrow in mitosis?
Microfilaments
When does the cleavae furrow form?
During telophase/cytokinesis
What is the first sign of mitosis?
The visible condensing of the chromosomes during prophase
Can erythrocytes undergo mitosis?
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
Interphase corresponds to which phase of the cell cycle?
G1 + S phase + G2
When do the genomes of mitochondria and chloroplasts replicate?
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
Characteristics of fungi
Eukaryotes
haploid for most of the life cycle
Produce spores