Which of the following is most accurate regarding cells?
1.All cells have a nucleus.
2.All cells divide by meiosis.
3.All living organisms are made up of one or more cells.
4.Cells arise through spontaneous generation.
5.Growth is solely the result of cell division.
3
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Moss sperm are produced in
A. archegonia.B. sporophytes. C. antheridia. D. lycophylls. E. stomata.
Metastatic cancer is
A) terminally differentiated. B) malignant. C) invasive. D) B and C only E) A, B, and C
No one is certain what the function of the human appendix is. But, one thing we do know is that we can live without it, without noticeable consequences. Therefore, the human appendix is an example of a(n)
A) mutation. B) vestigial structure. C) analogous structure. D) homologous structure. E) adaptation.
The urinary system helps to maintain the extracellular fluid pH by ____.
A. synthesizing buffers B. retaining carbon dioxide in the filtrate C. excreting excess hydrogen ions D. combining hydrogen ions with urea E. excreting filtrate