Each summer, a large "dead zone" devoid of fish and other animals develops where the Mississippi River flows into the Gulf of Mexico. What causes this?
A) Large quantities of fertilizer run off from Midwestern farm fields into the Mississippi River.
B) Global warming is making the river water too hot for the fish to tolerate.
C) High levels of pesticides are used in the Mississippi River basin.
D) There are high levels of mercury in the river water.
E) Acid rain makes the gulf's water too acidic to support fish.
A
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Which of the following IS a characteristic of an isoenzyme?
A) More than one enzyme is regulated by the same mechanism. B) The same reaction can be catalyzed by multiple enzyme variants. C) Multiple binding sites on the same enzyme enable multiple regulation mechanisms. D) More than one gene makes the same enzyme.
A neutral mutation is a mutation that _____ increase the reproductive fitness of an organism
A. does B. does not
The anther represents the _____ portion of the plant, while the ovules represent the ____ portion of the plant
A. Female ; male B. Male ; female C. Female ; female D. Male ; male
The result of __________ is the division of a cell’s chromosomes into two new nuclei, each of which has the same amount and type of DNA as the original nucleus. The division of the cells cytoplasm is called __________and occurs with the production of two new cells.
A. cytokinesis; mitosis B. interphase; mitosis C. mitosis; cytokinesis D. mitosis; interphase