Chapter 12

Which of the following is associated with cleavage furrow
in animal cells

• f-actin

• myosin

• g-actin

• All are correct

Which amino acid is most likely to be in the transmembrane region?

• Cystine

• Serine

• Lysine

• Valine

What signals transduction in a signal transduction pathway?

• conformational change in receptor due to ligand binding

• configurational change in receptor due to ligand binding

• Ligand entering cell through receptor channel

• Ligand conformational change as it passes through receptor channel

How is the resting membrane potential of
neurons established?

• The greater concentration of potassium inside of the neuron

• sodium-potassium pump

• “leak”
  ion channels

• Voltage gated ion channels

How can the membrane potential of a neuron be changed?

• Stimulus

• Voltage gated ion channels
  opening and closing

• hyperpolarization

• depolarization

Which is/are true about what happens when a depolarization
in a neuron reaches threshold?

• The membrane potential will never go back to rest

• signal is sent from presynaptic to postsynaptic neuron

• action potential

• The membrane potential will eventually go back to rest

When blood glucose _____, insulin signaling leads to an ______ in transcription of key
enzymes in glycolysis and a _____ of glucose.

• Increase; increase; removal

• Increase; decrease; removal

• decrease; increase; release

• decrease; decrease; release

When blood glucose _____, glucagon signaling leads to an ______ glycogen phosphorylase and a _____ of glucose.

• Increase; activation; removal

• decrease; deactivation; release

• decrease; deactivation; removal

• decrease; activation; release

Which of the following are results of receptor tyrosine kinase receives a signal?

• receptor tyrosine kinase proteins dimerize

• receptor tyrosine kinase proteins break apart

• autophosphorylation

• ATP--> ADP

• The receptor deactivates

Draw the pathway of apoptosis (include both internal and external signals)