AP BIO - UNIT 4 AP CLASSROOM
EXAM QUESTIONS AND ANSWERS
An antigen can induce an immune response in a host organism. Antigens are targeted
by antibodies that are produced by the organism's immune system in response to
contact with the antigen. Antibodies are specific to antigens. Many different cell types
are involved in immune responses.
Which of the following best describes the role of cell-to-cell communication during a
response to an invasion of antigens? - Correct Answers -Chemicals that are secreted
from antigen-presenting cells then activate helper T cells.
Adjacent plant cells have narrow channels called plasmodesmata that pass through the
cell walls of the connected cells and allow a cytoplasmic connection between the cells.
Which of the following statements best describes a primary function of plasmodesmata?
- Correct Answers -They allow the movement of molecules from one cell to another,
enabling communication between cells.
GG proteins are a family of receptor proteins that are involved in transmitting signals
from outside a cell to inside a cell. When a signaling molecule binds to a GG protein, the
GG protein is activated. The GG protein then activates an enzyme that produces a
second messenger called cAMPcAMP.
Which of the following describes a critical role of cAMPcAMP during the transduction
stage of a GG protein signal transduction pathway? - Correct Answers -??? cAMP binds
the extracellular signal molecule and carries it to the intracellular target specified by the
signal.
Metformin is a drug used to treat type 2 diabetes by decreasing glucose production in
the liver. AMPAMP-activated protein kinase (AMPK)(AMPK) is a major cellular regulator
of glucose metabolism. Metformin activates AMPKAMPK in liver cells but cannot cross
the plasma membrane. By blocking AMPKAMPK with an inhibitor, researchers found
that AMPKAMPK activation is required for metformin to produce an inhibitory effect on
glucose production by liver cells.
Which of the following best describes the component that metformin represents in a
signal transduction pathway that regulates glucose production in the liver? - Correct
Answers -??? It is a ligand that activates the signal transduction pathway of the
activation of AMPKAMPK.
A hydrophilic peptide hormone is produced in the anterior pituitary gland located at the
base of the brain. The hormone targets specific cells in many parts of the body.
EXAM QUESTIONS AND ANSWERS
An antigen can induce an immune response in a host organism. Antigens are targeted
by antibodies that are produced by the organism's immune system in response to
contact with the antigen. Antibodies are specific to antigens. Many different cell types
are involved in immune responses.
Which of the following best describes the role of cell-to-cell communication during a
response to an invasion of antigens? - Correct Answers -Chemicals that are secreted
from antigen-presenting cells then activate helper T cells.
Adjacent plant cells have narrow channels called plasmodesmata that pass through the
cell walls of the connected cells and allow a cytoplasmic connection between the cells.
Which of the following statements best describes a primary function of plasmodesmata?
- Correct Answers -They allow the movement of molecules from one cell to another,
enabling communication between cells.
GG proteins are a family of receptor proteins that are involved in transmitting signals
from outside a cell to inside a cell. When a signaling molecule binds to a GG protein, the
GG protein is activated. The GG protein then activates an enzyme that produces a
second messenger called cAMPcAMP.
Which of the following describes a critical role of cAMPcAMP during the transduction
stage of a GG protein signal transduction pathway? - Correct Answers -??? cAMP binds
the extracellular signal molecule and carries it to the intracellular target specified by the
signal.
Metformin is a drug used to treat type 2 diabetes by decreasing glucose production in
the liver. AMPAMP-activated protein kinase (AMPK)(AMPK) is a major cellular regulator
of glucose metabolism. Metformin activates AMPKAMPK in liver cells but cannot cross
the plasma membrane. By blocking AMPKAMPK with an inhibitor, researchers found
that AMPKAMPK activation is required for metformin to produce an inhibitory effect on
glucose production by liver cells.
Which of the following best describes the component that metformin represents in a
signal transduction pathway that regulates glucose production in the liver? - Correct
Answers -??? It is a ligand that activates the signal transduction pathway of the
activation of AMPKAMPK.
A hydrophilic peptide hormone is produced in the anterior pituitary gland located at the
base of the brain. The hormone targets specific cells in many parts of the body.
