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Cell Signaling Part 1 Concept Review

Last updated over 7 years ago
10 questions
Note from the author:
An assignment to insure understanding of key concept concerning cell signaling.
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Above is shown the 4 major types of cell communication. Match the following Biological events with the type of cell signaling that BEST matches what is happening in the organism.

  • Chemical Signals regulating rhythmic muscle contraction are propagated down the length of cardiac muscle fibers from one cell to the next.
  • T cells responding to the activated version of the antigun they produced and being stimulated to divide and reproduce more of the activated antigen type.
  • Mast cell in the respiratory system releasing histamine in response to the presence of an aborigine.
  • Bovine growth Hormone is released during development of a young calf.
  • autocrine signal
  • endocrine signal
  • paracrine signal
  • intercellular signaling
Figure 9.8 A receptor tyrosine kinase is an enzyme-linked receptor with a single transmembrane region, and
extracellular and intracellular domains. Binding of a signaling molecule to the extracellular domain causes the
receptor to dimerize. Tyrosine residues on the intracellular domain are then autophosphorylated, triggering a
downstream cellular response. The signal is terminated by a phosphatase that removes the phosphates from the
phosphotyrosine residues.
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Figure 9.10 The epidermal growth factor (EGF) receptor (EGFR) is a receptor tyrosine kinase involved in
the regulation of cell growth, wound healing, and tissue repair. When EGF binds to the EGFR, a cascade of
downstream events causes the cell to grow and divide. If EGFR is activated at inappropriate times, uncontrolled
cell growth (cancer) may occur.
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1

What property prevents the ligands of cell-surface
receptors from entering the cell?

1

The secretion of hormones by the pituitary gland is an
example of _______________.

1

Why are ion channels necessary to transport ions into or
out of a cell?

1

Endocrine signals are transmitted more slowly than
paracrine signals because ___________.

1

What is the function of a phosphatase?

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