BMB 252 Exam 1 (HW 1–5 Questions) – Study Guide, Practice Questions &
Revision Notes
What binds to an extracellular signal? - ✔✔Receptor
T/F: Some signal transduction proteins are similar (homologous) in yeast and human. -
✔✔True
Which of the following is not a signaling molecule?
-Gas CO
-Nucleotide
-Steroid
-Neurotransmitter
-All of the above can be signaling molecules - ✔✔All of the above can be signaling molecules
T/F: Some signaling molecules can travel through the cellular membrane and bind to their
targets inside the cell. - ✔✔True
Lymphocytes have receptors for their own signals that result in their self-activation as well. This
type of signaling is ________ - ✔✔autocrine
Which of the following signaling types can be used to guide cell movement?
-paracrine
-synaptic
-Endocrine
-Contact-dependent - ✔✔Paracrine and contact-dependent
, T/F: Neurotransmitters have higher affinity to their receptors than hormones. - ✔✔False
T/F: If a cell receives no signals, it will die. - ✔✔True
Which signal is transduced faster?
-The one that involves a new protein synthesis
-The one that changes the protein modification stat - ✔✔The one that changes the protein
modification state
T/F: Acetylcholine always causes muscles to contract - ✔✔false
T/F: Acetylcholine binds only to one type of receptor - ✔✔false
Ion pumps pump signals back into _______ to clear the synapse - ✔✔Presynaptic cell
Which of the following is reversible?
-Receptor sequestration
-Receptor down-regulation - ✔✔Receptor sequestration
Which feedback loop can result in oscillation? - ✔✔Negative
The ligand molecule for the ion channel-coupled receptor is __________ -
✔✔Neurotransmitter
GPCR transmits the signal by _________________________________ - ✔✔Binding G protein
and changing its conformation so that it dissociates GDP
Revision Notes
What binds to an extracellular signal? - ✔✔Receptor
T/F: Some signal transduction proteins are similar (homologous) in yeast and human. -
✔✔True
Which of the following is not a signaling molecule?
-Gas CO
-Nucleotide
-Steroid
-Neurotransmitter
-All of the above can be signaling molecules - ✔✔All of the above can be signaling molecules
T/F: Some signaling molecules can travel through the cellular membrane and bind to their
targets inside the cell. - ✔✔True
Lymphocytes have receptors for their own signals that result in their self-activation as well. This
type of signaling is ________ - ✔✔autocrine
Which of the following signaling types can be used to guide cell movement?
-paracrine
-synaptic
-Endocrine
-Contact-dependent - ✔✔Paracrine and contact-dependent
, T/F: Neurotransmitters have higher affinity to their receptors than hormones. - ✔✔False
T/F: If a cell receives no signals, it will die. - ✔✔True
Which signal is transduced faster?
-The one that involves a new protein synthesis
-The one that changes the protein modification stat - ✔✔The one that changes the protein
modification state
T/F: Acetylcholine always causes muscles to contract - ✔✔false
T/F: Acetylcholine binds only to one type of receptor - ✔✔false
Ion pumps pump signals back into _______ to clear the synapse - ✔✔Presynaptic cell
Which of the following is reversible?
-Receptor sequestration
-Receptor down-regulation - ✔✔Receptor sequestration
Which feedback loop can result in oscillation? - ✔✔Negative
The ligand molecule for the ion channel-coupled receptor is __________ -
✔✔Neurotransmitter
GPCR transmits the signal by _________________________________ - ✔✔Binding G protein
and changing its conformation so that it dissociates GDP
