ASU BIO 181 Exam 3 (13–16). Questions and Answers, Rated
A+. VERIFIED.
ASU BIO 181 Exam 3 (Chapters 13-16) 100 Q&A
Cell Communication & Signaling
1. What is the first step in cell signaling?
A) Transduction
B) Response
C) Reception
D) Amplification
2. A ligand is another term for:
A) A receptor
B) A second messenger
C) A signaling molecule
D) A response protein
3. G-protein coupled receptors (GPCRs):
A) Are intracellular receptors
B) Work by activating a G-protein
C) Directly phosphorylate proteins
D) Are channels that open for ions
4. Receptor Tyrosine Kinases (RTKs) often initiate pathways involved in:
A) Cell growth and division
B) Direct ion passage
C) Carbohydrate metabolism
D) Programmed cell death
5. What is the role of a protein kinase?
A) Activate a G-protein
B) Add a phosphate group to a protein
, C) Remove a phosphate group from a protein
D) Degrade cyclic AMP (cAMP)
6. A second messenger, such as cAMP or Ca²⁺, functions to:
A) Bind to the extracellular ligand
B) Relay and amplify the signal inside the cell
C) Terminate the signal
D) Serve as the primary receptor
7. Apoptosis is best described as:
A) Uncontrolled cell death leading to inflammation
B) Programmed, controlled cell suicide
C) A type of cell division
D) A failure in cell signaling
8. In a signal transduction pathway, the signal is often amplified, meaning:
A) The ligand becomes stronger
B) A single signaling molecule can lead to a large cellular response
C) The receptor is duplicated
D) The cell becomes more sensitive to other signals
9. A molecule that binds to a receptor and blocks the signal is called a(n):
A) Agonist
B) Antagonist
C) Kinase
D) Phosphatase
10.Phosphatases are enzymes that:
A) Add phosphate groups
B) Remove phosphate groups
C) Synthesize cAMP
D) Degrade ligands
The Cell Cycle & Mitosis
, 11.The correct sequence of the eukaryotic cell cycle is:
A) G1, S, G2, M, C
B) G1, S, G2, M
C) M, G1, S, G2
D) S, G1, G2, M
12.DNA replication occurs during which phase?
A) G1
B) S
C) G2
D) M
13.The division of the cytoplasm is called:
A) Mitosis
B) Cytokinesis
C) Synthesis
D) Karyokinesis
14.Sister chromatids are:
A) A pair of homologous chromosomes
B) Identical copies of a single chromosome connected at the
centromere
C) Different alleles of the same gene
D) Found in haploid cells
15.During which phase of mitosis do the chromosomes line up at the
metaphase plate?
A) Prophase
B) Metaphase
C) Anaphase
D) Telophase
16.The separation of sister chromatids occurs during:
A) Prophase
B) Metaphase
A+. VERIFIED.
ASU BIO 181 Exam 3 (Chapters 13-16) 100 Q&A
Cell Communication & Signaling
1. What is the first step in cell signaling?
A) Transduction
B) Response
C) Reception
D) Amplification
2. A ligand is another term for:
A) A receptor
B) A second messenger
C) A signaling molecule
D) A response protein
3. G-protein coupled receptors (GPCRs):
A) Are intracellular receptors
B) Work by activating a G-protein
C) Directly phosphorylate proteins
D) Are channels that open for ions
4. Receptor Tyrosine Kinases (RTKs) often initiate pathways involved in:
A) Cell growth and division
B) Direct ion passage
C) Carbohydrate metabolism
D) Programmed cell death
5. What is the role of a protein kinase?
A) Activate a G-protein
B) Add a phosphate group to a protein
, C) Remove a phosphate group from a protein
D) Degrade cyclic AMP (cAMP)
6. A second messenger, such as cAMP or Ca²⁺, functions to:
A) Bind to the extracellular ligand
B) Relay and amplify the signal inside the cell
C) Terminate the signal
D) Serve as the primary receptor
7. Apoptosis is best described as:
A) Uncontrolled cell death leading to inflammation
B) Programmed, controlled cell suicide
C) A type of cell division
D) A failure in cell signaling
8. In a signal transduction pathway, the signal is often amplified, meaning:
A) The ligand becomes stronger
B) A single signaling molecule can lead to a large cellular response
C) The receptor is duplicated
D) The cell becomes more sensitive to other signals
9. A molecule that binds to a receptor and blocks the signal is called a(n):
A) Agonist
B) Antagonist
C) Kinase
D) Phosphatase
10.Phosphatases are enzymes that:
A) Add phosphate groups
B) Remove phosphate groups
C) Synthesize cAMP
D) Degrade ligands
The Cell Cycle & Mitosis
, 11.The correct sequence of the eukaryotic cell cycle is:
A) G1, S, G2, M, C
B) G1, S, G2, M
C) M, G1, S, G2
D) S, G1, G2, M
12.DNA replication occurs during which phase?
A) G1
B) S
C) G2
D) M
13.The division of the cytoplasm is called:
A) Mitosis
B) Cytokinesis
C) Synthesis
D) Karyokinesis
14.Sister chromatids are:
A) A pair of homologous chromosomes
B) Identical copies of a single chromosome connected at the
centromere
C) Different alleles of the same gene
D) Found in haploid cells
15.During which phase of mitosis do the chromosomes line up at the
metaphase plate?
A) Prophase
B) Metaphase
C) Anaphase
D) Telophase
16.The separation of sister chromatids occurs during:
A) Prophase
B) Metaphase
