You go on a canoe trip to the Boundary Waters Canoe Area (BWCA) in Northern Minnesota. This ecosystem is cold most of the year and receives plenty of rainfall. It has many lakes that are full of walleye pike fish. You know that walleye like to eat minnows. In turn, the minnows feed on scuds (zooplankton) which eat algae (phytoplankton). In this system, the zooplankton are the
A. primary consumers
B. decomposers.
C. producers.
D. secondary consumers.
Answer: A. primary consumers
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Generally speaking, fluids in plants are
A) pushed through phloem with a pressure gradient and pulled through xylem. B) pushed through xylem with a pressure gradient and pulled through phloem. C) pulled through both xylem and phloem. D) actively pumped throughout the plant.
When mast cells degranulate and release histamine, which of the following events may occur?
A) constriction of small blood vessels B) bronchial spasms C) increased mucus production D) both constriction of small blood vessels and bronchial spasms E) both bronchial spasms and increased mucus production
The lacA gene found within the lac operon encodes for galactosidase transacetylase. This enzyme attaches a(n) ________ group to lactose and lactose analogs.
A. acetyl B. carboxyl C. carbonyl D. amino E. hydroxyl
How many molecules of NADH are produced during glycolysis?
A) 2 B) 3 C) 8 D) 6 E) 4