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1. From chemical to
Chemical, organelle, cell, tissue, organ, organ system, organism
or- ganism
2. How the control
cen- ter responds
to infor- mation
3. Regulation of
blood glucose
levels by
a negative
feedback
mechanism
involving
pancreatic Fat soluble substances CAN go through, water soluble CANNOT
hormones unless there are channels
4. Structure of the
plas- ma
membrane
5. Transport protein (a) A protein that spans the membrane may provide
hydrophilic channel
across the membrane that is selective for a particular solute.
(b) Some transport proteins hydrolyze ATP as an energy source
to actively pump substances across the membrane.
6. Intercellular junctions Membrane proteins of adjacent cells may be hooked together
var-
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,BMS 595 Exam 1 THE CELL questions and answers
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ious kinds of intercellular junctions. Some membrane proteins of
this group provide temporary binding sites that guide cell
migration and other cell-to-cell interactions.
7. Enzyme A protein built into the membrane may be an enzyme with its
active site exposed to substances in the adjacent solution. In
some cases, several
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