Bacteriophage release is a gradual process in which small numbers are released at a time
Indicate whether the statement is true or false
FALSE
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Many specialized cells, such as white blood cells, ____
a. remain in G0 until stimulated by external signals to reenter the cell cycle and divide b. remain in S until hormonal signals cause the cell to reenter the cell cycle and divide c. divide continuously and never transition to G0 d. mutate into other cell types by signals from bone marrow cells e. skip anaphase in order to avoid the high likelihood of mutation during this phase of mitosis
The part of the brain that controls signal flow
between the cerebellum and integrating centers in the forebrain is the a. cerebrum. b. pons. c. cerebellum. d. fissure of Rolando. e. hypothalamus.
Control systems in the cell can induce cell suicide, or apoptosis, in cells with excessive DNA damage
a. True b. False
Select the valid statements about cell signalling from the list below. There may be more than one valid statement
A. Steroid hormones usually don't need receptors because they can pass freely through the cell membrane. B. IP3 can open Ca2+ channels in the membrane of endoplasmic reticulum C. A decrease in cAMP activates protein kinase A (PKA) D. GPCRs activate a class of trimeric GTP binding proteins