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Bio 12 Homework Packet 2
- Course
- Bio 12
- Institution
- Saddleback College
This is a comprehensive and detailed homework packet 2; cell membrane, proteins and membrane structure.
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BIO 12 Homework Packet 2 Saddleback College Name:__________________________CELL MEMBRANE, PROTEINS, AND MEMBRANE TRANSPORT
Match each of the following terms with the description below. More than one term (a-c) may be used to match each
description. Code answers on your scantron form. Choices may be used more than once.
A. active transport B. simple diffusion C. facilitated diffusion
1. uses cellular energy for transport of substrate
2. transport of substrate occurs from a region of high to low substrate concentration
3. transport requires a membrane carrier protein
4. <uphill= movement of substrate (that is, against its gradient)
5. energy for transport is provided by the substrate, not the cell
6. Small uncharged molecules, urea, gases and short chain alcohols
a) require a carrier to get through the cell membrane
b) pass freely through the lipid bilayer by diffusion
c) do not pass through membranes at all
7. Amino acids and glucose, as well as ions and any charged species
a) require a carrier to get through the cell membrane
b) pass freely through the lipid bilayer by diffusion
c) do not pass through any portion of the membrane at all
8. More than one selection may be correct. Select all choices that apply. Phospholipid molecules are
a) have regions that are partly polar and partly nonpolar
b) contain a negatively-charged phosphate group and a positively-charged nitrogen group
c) are modified triglycerides
d) are components of the cell membrane
9. The Na+-K+ pump is an integral membrane protein that transports Na+ ions ___the cell and K+ ions ____ the cell.
a) into, into c) out of, out of
b) into, out of d) out of, into
MEMBRANE POTENTIALS AND ACTION POTENTIALS
1. Sodium's electrochemical gradient drives it ___ the cell, and potassium9s drives it ___ the resting cell.
a) into, out of c) out of, out of
b) into, into d) out of, into
2. In a neuron with a resting membrane potential of -65mV, the distribution of which ion across the neuronal
membrane represents the greatest electrical potential?
a) Potassium c) Sodium
b) Chloride d) Calcium
1
, DENDRITES TO SYNAPSE
The Neuron
A. Nodes de Ranvier B. spinal cord C. myelination D. motor E. sensory
AB. effector AC. axon AD. dendrite AE. synapse BC. brain
BD. soma BE. Axon hillock CD. terminal bouton CE. afferent DE. efferent
1. Processes that carry the action potential (impulse) away from the cell body.
2. The short, numerous, receptive processes of a neuron.
3. Gaps in the myelin sheath of a neuron.
4. The CNS consists of these two structures.
5. The PNS consists of the _________________ nerves and __________________ nerves.
6. Neurons that carry an impulse from a sensory receptor to the CNS.
7. Neurons that carry an impulse from the CNS to a muscle or gland are called.
8. The cell body of a neuron.
9. This will change its physiology in response to a nerve impulse and subsequent release of a
neurotransmitter. Includes muscles, glands, and adipose tissue.
10. Acts as an insulator, which allows for rapid transmission of an action potential in a saltatory
manner.
11. Contains synaptic vesicles that will fuse with the neuronal membrane and release a
neurotransmitter.
12. The functional contact between the axon terminal of one neuron and a downstream neuronal cell
body.
13. This is where the neuronal cell body and axon meet. If a local potential is enough, a total reversal
of resting membrane potential will begin in this location.
, EPSPs & IPSPs
Complete tables below:
OPEN: Na+ K+ Cl- Ca2+
Diffuse in or out?
Depol or Hyperpol?
(EPSPs) (IPSPs)
INHIBIT: Na+ K+ Cl- Ca2+
Trapped in or out?
Depol or Hyperpol?
(EPSPs) (IPSPs)
Indicate the interval(s) that best correlate with each statement.
More than one letter may apply to each statement.
Select from intervals a, b, c, d, e or AB.
14. Permeability to K+ is still elevated even as the Na+ permeability has returned to normal, resting values.
15. The membrane is more permeable to K+ than to Na+, and these permeabilities are not increasing or
decreasing, but are constant and unchanging.
16. The membrane is experiencing rapid changes in Na+ permeability.
17. Na+ and K+ are both at equilibrium (i.e., the electrical gradient for each ion is equal and opposite in direction
to the chemical gradient.)
18. Time during which Na+ K+ pump is working.
19. The event shown above can be experienced by
a) All cells of the body
b) Only neurons and muscle cells
3
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