BIOL 373 UNIT 1 QUIZ
A given signal molecule...
a) May elicit different responses in different target cells or after binding with different receptor types
b) Will elicit the same response regardless of the receptor type
c) Will elicit the same response regardless of the target cell type - correct answer ✔✔a) May elicit
different responses in different target cells or after binding with different receptor types
What is a key difference between a local (paracrine) regulator and a hormone?
a) Local regulators often open ligand-gated channels and affect ion concentrations in cells; hormones
bind with intracellular receptors and affect gene expression
b) Local regulators diffuse to neighbouring cells; hormones usually travel throughout the body to distant
target cells
c) The signal transduction pathways of local regulators do not involve second messengers; pathways
triggered by hormones do involve second messengers
d) Local regulators initiate short-term responses; hormones trigger longer-lasting responses
e) Local regulators are small, hydrophobic molecules; hormones are either large polypeptides or steroids
- correct answer ✔✔b) Local regulators diffuse to neighbouring cells; hormones usually travel
throughout the body to distant target cells
What event is common to ALL signal transduction pathways?
A given signal molecule...
a) May elicit different responses in different target cells or after binding with different receptor types
b) Will elicit the same response regardless of the receptor type
c) Will elicit the same response regardless of the target cell type - correct answer ✔✔a) May elicit
different responses in different target cells or after binding with different receptor types
What is a key difference between a local (paracrine) regulator and a hormone?
a) Local regulators often open ligand-gated channels and affect ion concentrations in cells; hormones
bind with intracellular receptors and affect gene expression
b) Local regulators diffuse to neighbouring cells; hormones usually travel throughout the body to distant
target cells
c) The signal transduction pathways of local regulators do not involve second messengers; pathways
triggered by hormones do involve second messengers
d) Local regulators initiate short-term responses; hormones trigger longer-lasting responses
e) Local regulators are small, hydrophobic molecules; hormones are either large polypeptides or steroids
- correct answer ✔✔b) Local regulators diffuse to neighbouring cells; hormones usually travel
throughout the body to distant target cells
What event is common to ALL signal transduction pathways?
