What is the typical depth of light penetration in the open ocean?
a. 40 meters
b. 100 meters
c. 330 meters
d. 600 meters
ANS: B
Light penetrates to approximately 100 meters in most areas. In tropical regions, the photic zone can
reach up to 600 meters. Information can be found in the section Light Does Not Travel Far through the
Ocean.
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HIV/AIDS is a(n) ___________ disease that is also transmissible from person to person.
Fill in the blank(s) with the appropriate word(s).
Why should one not stare at the Sun during an eclipse?
A) because, whether there is an eclipse or not, the Sun's intense radiation can easily damage our eyes B) because the eclipse event itself creates a lensing effect, which greatly magnifies and intensifies the Sun's rays C) because Sunspots, which are excited by the eclipse event, can easily erupt during the eclipse D) because ultraviolet radiation is intensified during the event E) because coronas and corneas are always a bad mix
Using the 20 standard amino acids how many tripeptides containing three different amino acids can be made?
A) 60 B) 400 C) 6840 D) 8000
Why is grain production in the Great Plains considered largely unsustainable?
A) Competition with cattle ranching is resulting in a decline in crop production. B) More and more people are becoming gluten intolerant, so there will be less and less demand for wheat, barley, and rye. C) The Ogallala aquifer is being depleted for irrigation water. D) The energetics of crop production in the Great Plains are such that more energy is needed to grow the crops than can be gotten from the crops. E) So many pesticides are needed for grain production that streams in the Great Plains are becoming dead zones.