A cellular response to a signal can be terminated by:
A. depletion of the signal that activates the
receptor.
B. inactivation of intracellular signaltransduction
proteins.
C. automatic inactivation of proteins in the
signal pathway over time.
D. depletion of a second messenger.
E. All of these choices are correct.
E
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What feature of RNA is directly or indirectly responsible for the unique structural properties of RNA?
What will be an ideal response?
Differential gene expression is defined as the:a
ability of some cells to arrest their development under varying environmental conditions. b. progressive fixation of the fates of a cell's descendants. c. genetic variation found in various somatic cells of the same individual. d. regulation during development that varies the type and quantity of gene products among cells. e. constitutive expression of all genes in the somatic cells.
osmosis
What will be an ideal response?
Which of the following are not included among the bilateria, a clade of animals with bilateral symmetry at some stage of development?
A) sea stars (Echinodermata) B) earthworms (Annelida) C) sea anemones (Cnidaria) D) octopus (Mollusca)