All of the following are chemical mutations EXCEPT
A. hydroxylamine.
B. ethyl methanesulfonate.
C. nitrogen mustard.
D. X-rays.
E. nitrous acid.
Answer: D
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A community includes both living and nonliving components
Indicate whether the statement is true or false
Cells able to divide and form some types of cells in an organism are called:a
pluripotent stem cells. b. terminally differentiated cells. c. germ line cells. d. morphogenic cells. e. developmental cells.
Retinoblastoma is caused by mutation in Rb gene, and its cell of origin is (A)_________. In normal cells, Rb protein inhibits E2F dependent transcription, thus inhibits entry of (B)____________.
a. (A) Cone, (B) S phase b. (A) Cone, (B) G2 phase c. (A) Rod, (B) S phase d. (A) Rod, (B) G2 phase
Only the nervous and endocrine systems are involved in homeostasis.
Answer the following statement true (T) or false (F)