An oligotrophic ecosystem would be most likely to exist in a/an ________
a) Ocean
b) High mountain lake
c) Tropical pond
d) Polluted river
Answer: b) High mountain lake
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The number of neural cells in the cerebral cortex decreases during the aging process.
Answer the following statement true (T) or false (F)
Which of the following represents the overall sequence of events during mitosis?
a. prophase ? metaphase ? anaphase ? telophase b. interphase ? metaphase ? anaphase ? telophase c. anaphase ? telophase ? metaphase ? interphase d. interphase ? prophase ? anaphase ? metaphase e. metaphase ? telophase ? anaphase ? prophase
The initiation of the S phase and the M phase of the cell cycle depends on a pair of molecules called _______ and _______.
a. actin; myosin b. Cdk's; cyclin c. ligand; receptor d. MSH; MSH-receptor e. ATP; ATPase
Animals are thought to have descended from choanoflagellate protists. Which poriferan cell type lends evidence to this claim?
A. Amoebocyte B. Gamete C. Choanocyte D. Spicule