C2.1 Chemical Signaling
17 review questions with answers for C2.1 Chemical Signaling, marked HL. Read them here, or play the set as a class game on the projector. Free to host, and students join with a code.
General term for any chemical messenger secreted into the blood that acts on distant target cells?
- Luciferase
- Ligand
- HormoneRight answer
- Target cell
All 17 questions and answers
General term for any chemical messenger secreted into the blood that acts on distant target cells?
Answer: Hormone
A ductless gland that secretes hormones directly into the bloodstream?
Answer: Endocrine gland
A cell that possesses specific receptors for a particular hormone?
Answer: Target cell
The brain region that acts as the control center for homeostasis and the pituitary?
Answer: Hypothalamus
The "master gland" consisting of anterior and posterior lobes?
Answer: Pituitary gland
A signaling molecule that binds specifically to a receptor?
Answer: Ligand
Receptors that act through a G protein, often leading to cAMP production?
Answer: GPCRs (G Protein-Coupled Receptors)
Receptors that open or close a "gate" in response to a ligand, allowing ions to flow?
Answer: Ligand-gated ion channels
Chain reaction: epinephrine → G protein → ? → cAMP
Answer: Adenylyl cyclase
Signals targeting neighboring cells (like neurotransmitters)?
Answer: Paracrine signaling
Signalling in which a cell responds to a signal it secreted itself (e.g., IL-2 on T cells)?
Answer: Autocrine signaling
Long-distance signaling via the blood (hormones)?
Answer: Endocrine signaling
What is the term for a signal molecule whose concentration rises as bacterial density increases?
Answer: Autoinducer (e.g., AHL)
In Vibrio fischeri, what is the name of the cytoplasmic receptor?
Answer: LuxR
In Vibrio fischeri, which enzyme is made once autoinducer reaches a threshold concentration, producing light?
Answer: Luciferase
What term describes a lipid-soluble hormone that crosses the membrane and binds intracellular receptors?
Answer: Steroid hormone
Water-soluble hormone made of amino acid chains that binds membrane receptors (e.g., insulin)?
Answer: Peptide hormone
Play it as a class game
Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options are other answers from the same set.