Question

1 multiple choice 1 point
which is the correct order for these steps in cell signaling?
signal transduction, receptor activation, response
receptor activation, response, signal transduction
response, signal transduction, termination
receptor activation, signal transduction, response
2 multiple choice 1 point
what protein forms the contractile ring during cytokinesis in animal cells?
kinesin
dna polymerase
actin
dynein
3 multiple choice 1 point
dynamic instability is a:
feature of microtubules
feature of microfilaments
feature of microtubules and microfilaments
feature of intermediate filaments
universal feature of the cytoskeleton

Explanation:

1. In cell signaling, the process starts with receptor activation when a signal molecule binds to a receptor. Then, signal transduction occurs where the signal is relayed and amplified inside the cell. Finally, a response is generated.
2. During cytokinesis in animal cells, the contractile ring is formed by actin filaments. Actin is a key protein in muscle contraction and cell - shape changes.
3. Dynamic instability is a property of microtubules. Microtubules can rapidly switch between growth (polymerization) and shrinkage (depolymerization) phases.

Answer:

1. receptor activation, signal transduction, response
2. actin
3. feature of microtubules