Not every piece of DNA is used in a cell to make proteins because
A. some of the DNA is used for regulation of gene expression.
B. not all genes are needed in every cell.
C. some sequences are needed to stabilize the end of the chromosomes.
D. All of the choices are correct.
D. All of the choices are correct.
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How are steroid hormone receptors and cell-surface receptors similar?
A. When bound to their ligand, both types enter the nucleus to activate transcription. B. Both types cause GDP to be exchanged for GTP in a G protein. C. Both types undergo a conformational change when they bind to their ligand. D. When activated the signals of both types are transduced across the plasma membrane.
The age at which a disease appears in an organism is called the _______
A. null age B. critical age C. age of incubation D. age of onset
A change in behavior related to a stimulus and response is
A. aversiveness. B. associative learning. C. habituation. D. orientation. E. aversiveness and habituation.
While running,
a. only your diastolic blood pressure would elevate. b. only your systolic blood pressure would elevate. c. both your diastolic and systolic blood pressure would elevate. d. both your diastolic and systolic blood pressure would decrease. e. there would be no change in either your diastolic or your systolic blood pressure.