Bio 180 Exam 5 BYUI Questions With
100% Verified Answers
Lipid-soluble signal molecules, such as testosterone, cross the
membranes of all cells but affect only target cells because: -
correct answer ✅Intracellular receptors are present only in target
cells.
Which type of receptor is most associated with metabolism, cell
growth, and cell division? -
correct answer ✅Tyrosine kinase receptors
Which type of receptor is a dimer that when bound to the proper
ligand autophosphorylates? -
correct answer ✅Tyrosine kinase receptors
A drug designed to inhibit the response of cells to testosterone
would almost certainly result in which of the following? -
correct answer ✅A decrease in transcriptional activity of certain
genes.
Binding of a signaling molecule to which type of receptor leads
directly to a change in distribution of ions on opposite sides of the
membrane? -
correct answer ✅Ligand-gated ion channel
,Bio 180 Exam 5 BYUI Questions With
100% Verified Answers
Which type of signaling is long-distance signaling mediated by
chemicals released into the blood? -
correct answer ✅Endocrine signaling
The dissociation constant (Kd) for a receptor is the ligand
concentration that results in ____ percent of the receptors being
bound. -
correct answer ✅50
The dissociation constants for epinephrine and norepinephrine on
beta2-adrenergic receptors are 0.50 and 0.10 nM, respectively.
Which of these ligands is more efficient in activating the beta2-
receptors? -
correct answer ✅Norepinephrine
An inhibitor of which of the following could be used to block the
release of calcium from the endoplasmic reticulum? -
correct answer ✅Phospholipase C
What explains the increased concentration of Ca2+ in the ER? -
correct answer ✅Calcium ions are actively imported from the
cytoplasm into the ER.
, Bio 180 Exam 5 BYUI Questions With
100% Verified Answers
At puberty, an adolescent female body changes in both structure
and function of several organ systems, primarily under the
influence of changing concentrations of estrogens and other steroid
hormones. How can one hormone, such as estrogen, mediate so
many effects? -
correct answer ✅Estrogen binds to specific receptors inside many
kinds of cells, each of which have different responses to its binding.
Where does IP3 come from? -
correct answer ✅A membrane phospholipid.
Cytokinesis typically occurs during: -
correct answer ✅Telophase
How many chromatids are there in somatic cells during G2 phase? -
correct answer ✅92
Which of the following statements is true regarding the difference
between mitosis and meiosis? -
correct answer ✅Following mitosis, each daughter cell is diploid,
while the cells resulting from meiosis are haploid.
100% Verified Answers
Lipid-soluble signal molecules, such as testosterone, cross the
membranes of all cells but affect only target cells because: -
correct answer ✅Intracellular receptors are present only in target
cells.
Which type of receptor is most associated with metabolism, cell
growth, and cell division? -
correct answer ✅Tyrosine kinase receptors
Which type of receptor is a dimer that when bound to the proper
ligand autophosphorylates? -
correct answer ✅Tyrosine kinase receptors
A drug designed to inhibit the response of cells to testosterone
would almost certainly result in which of the following? -
correct answer ✅A decrease in transcriptional activity of certain
genes.
Binding of a signaling molecule to which type of receptor leads
directly to a change in distribution of ions on opposite sides of the
membrane? -
correct answer ✅Ligand-gated ion channel
,Bio 180 Exam 5 BYUI Questions With
100% Verified Answers
Which type of signaling is long-distance signaling mediated by
chemicals released into the blood? -
correct answer ✅Endocrine signaling
The dissociation constant (Kd) for a receptor is the ligand
concentration that results in ____ percent of the receptors being
bound. -
correct answer ✅50
The dissociation constants for epinephrine and norepinephrine on
beta2-adrenergic receptors are 0.50 and 0.10 nM, respectively.
Which of these ligands is more efficient in activating the beta2-
receptors? -
correct answer ✅Norepinephrine
An inhibitor of which of the following could be used to block the
release of calcium from the endoplasmic reticulum? -
correct answer ✅Phospholipase C
What explains the increased concentration of Ca2+ in the ER? -
correct answer ✅Calcium ions are actively imported from the
cytoplasm into the ER.
, Bio 180 Exam 5 BYUI Questions With
100% Verified Answers
At puberty, an adolescent female body changes in both structure
and function of several organ systems, primarily under the
influence of changing concentrations of estrogens and other steroid
hormones. How can one hormone, such as estrogen, mediate so
many effects? -
correct answer ✅Estrogen binds to specific receptors inside many
kinds of cells, each of which have different responses to its binding.
Where does IP3 come from? -
correct answer ✅A membrane phospholipid.
Cytokinesis typically occurs during: -
correct answer ✅Telophase
How many chromatids are there in somatic cells during G2 phase? -
correct answer ✅92
Which of the following statements is true regarding the difference
between mitosis and meiosis? -
correct answer ✅Following mitosis, each daughter cell is diploid,
while the cells resulting from meiosis are haploid.
