BSCS Biology: A Molecular Approach

Chapter 17: The Origin of Life

The Origin of Earth

1.
The "big bang" likely occurred how long ago?
A)about 15 billion years
B)about 10 billion years
C)about 100 million years
D)about 4.6 billion years
2.
If the history of Earth were displayed as a timeline starting from a person's nose to the tip of his or her outstretched finger, where on the arm would the history of humans begin?
A)around the wrist
B)near the elbow
C)at the outermost knuckle
D)at the very tip of the fingernail
3.
Why were the earliest organisms on earth probably not aerobic?
A)They were lazy.
B)There was no oxygen in the atmosphere.
C)They lived deep in the earth.
D)There was no atmosphere.
4.
About how long ago were modern levels of oxygen probably reached on earth?
A)360 million years
B)5 to 7 million years
C)2 billion years
D)4.6 billion years
5.
The wavelengths of light from distant galaxies, such as this one, have been observed to shift toward the ____ end of the color spectrum.
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078664276/281029/ccq_ch17_q5.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>
A)blue
B)green
C)red
D)yellow
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