Lecture 11 Flashcards
Motor proteins use energy from ______ to move along tracks in eukaryotic cells
ATP hydrolysis
Myosins move along what?
Actin filaments
Microtubule plus ends are at the cell ________
periphery
microtubule minus ends are at the cell ____
Centre, at the centrosome
What moves towards the MT plus ends?
Kinesin
What moves towards the MT minus ends?
Dynein
What are the 2 types of dynein?
Cytoplasmic dynein
Axonemal dynein
WHat kinds of axonemal dyneins are there?
Cilliary and flagellar
Cytoplasmic dynein works with a partner complex, ______
dynactin
What is transported by microtubule motors?
membranous organells
in axonal transport, the cytoplasmic dynein transports backwards to _____
the cell body
in axonal transport, kinesin outwards forwards to _____
the axon terminal
Vesicles take ____ to move down an axon 1 meter long
2 days
How are viruses transported from the plasma membrane to the nucleus?
By cytoplasmic dynein, either within endosomes, or as viral capsids
Where does anti-parallel sliding occur?
in mitotic and meiotic spindles
Where does parallel sliding occur?
in cilia and flagella
What are examples of cells with flagella?
vertebrate sperm
some protozoa
Ciliated cells
some protozoa
some epithelia
Ciliated cells have an extra set of _____ in the cilia, which are nucleated by the ______
microtubules
basal body
Rigor mortis is caused by a lack of ATP which causes…
tight binding of myosin II heads to actin
Which stage of the myosin II cross-bridge cycle explains rigor morits?
Stage 1
Myosin II walking along the actin is what?
Muscle contraction
