Macrocystis is the genus of kelp that dominates in:
a. the Indian Ocean.
b. the North Atlantic.
c. the Tropical Pacific.
d. the Mediterranean.
e. the Pacific Ocean.
E
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Use the following figure and information to answer the question(s) below
Fishes that have swim bladders can regulate their density and, thus, their buoyancy. There are two types of swim bladder: physostomous and physoclistous. The ancestral version is the physostomous version, in which the swim bladder is connected to the esophagus via a short tube (see the figure above). The fish fills this version by swimming to the surface, taking gulps of air, and directing them into the swim bladder. Air is removed from this version by "belching." The physoclistous version is more derived, and has lost its connection to the esophagus. Instead, gas enters and leaves the swim bladder via special circulatory mechanisms within the wall of the swim bladder. When a shark stops swimming, it _____. 1. sinks 2. quickly dies 3. oxygenates its blood less effectively A) 1 only B) 2 only C) 3 only D) 1 and 3 E) 1, 2, and 3
The greatest expression of the lac operon occurs when lactose levels are _____
A) low and glucose levels are low B) low and glucose levels are high C) high and glucose levels are low D) high and glucose levels are high
A clear lake is likely to be ____
a. very old b. well-lit c. shallow d. recently formed e. experiencing high primary productivity
_____ is needed to completely metabolize lactate to CO2 and H2O
Fill in the blank(s) with the appropriate word(s).