Choose the letter of the best match from the following:A. hotspotB. habitat lossC. edge effectsD. megafaunal extinctionE. extinction vortexPrimarily due to habitat destruction, pollution, human disruption, fragmentation.
Fill in the blank(s) with the appropriate word(s).
Answer: B
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High BOD values reflect small amounts of degradable organic matter in a sample of wastewater or other material
Indicate whether this statement is TRUE or FALSE.
Why must the life cycle of sexually reproducing species alternate between haploid and diploid stages?
A. Meiosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. B. Mitosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. C. The diploid stage allows for genetic recombination. D. Meiosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. E. Haploid cells cannot grow independently of diploid cells.
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of _____
A) ATP, CO2, and ethanol (ethyl alcohol) B) ATP, CO2, and lactate C) ATP, NADH, and pyruvate D) ATP, pyruvate, and acetyl CoA
What would happen if the chorion failed to secrete human chorionic gonadotropin?
A) The maternal elements of the placenta would fail to develop. B) The fetal elements of the placenta would fail to develop. C) Neural tube formation would not occur, and the embryo would have no central nervous system. D) The embryo would be spontaneously aborted.