It takes very few molecules of a hormone to cause changes in a target cell. This may be explained by the fact that: (Select all correct answer options.)
A. transcriptional activation produces many
copies of mRNA, each of which is translated
many times.
B. the mechanism of hormonal action
involves the replication of the hormone within
the target cell to quickly magnify the
hormone's effect.
C. hormones are large molecules that persist
for years and can repeatedly stimulate the
same cell.
D. the mechanism of hormonal action may
involve an enzyme cascade that amplifies the
response to a hormone.
E. the mechanism of hormonal action
involves memory cells that have had prior
contact with the hormone and immediately
respond to its presence.
A,D
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In situations where signaling pathway components need to be "fixed" in a particular position within the cell (e.g., in the yeast mating pathway), they are associated with ________.
Fill in the blank(s) with the appropriate word(s).
If a given protein’s level peaks early in G1, but is absent before the G2 transition, what can be inferred about its possible role in regulating the cell cycle?
a. This protein inhibits Cdk1. b. This protein activates Cdk1. c. This protein inhibits Cdk2. d. This protein activates Cdk2. e. This proteins is involved in DNA synthesis.
When ATP levels exceed the needs of the body, the body uses the ATP and excess glucose to produce glycogen. Where is the glycogen stored?
a. fat tissue b. stomach and small intestines c. liver and skeletal muscle d. beneath the skin
Your thigh bone, the largest bone in your body, is called the ________.
A. tibia B. fibula C. femur D. pelvis