After the replication of a cell's DNA, there are twice as many centromeres as there are chromatids.
a. true
b. false
Ans: b. false
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Which of the following statements is not true of a benign tumor?
1.It grows slowly.
2.It expands into surrounding tissue.
3.It does not spread via the bloodstream or lymphatic system.
4.None of the choices; all are true.
Sea creatures which are adapted to life at the bottom of the ocean reside ____
a. in the pelagic zone b. in the intertidal zone c. in the neritic zone d. near hydrothermal vents e. in the benthic province
Which of the following is an endoparasite?
A) flea B) tapeworm C) tick D) mosquito
This newly identified organism plays what healthy role for the skin
a. oxygen turnover due to its sulfur-deoxidizing ability b. sulfur turnover due to its chlorine-deoxidizing ability c. carbon dioxide turnover due to its ammonia-oxidizing ability d. nitrogen turnover due to its ammonia-oxidizing ability