Photosynthetic organisms using the oxygenreleasing
pathway appeared on earth about
____ billion years ago.
a. 1.3
b. 1.8
c. 2.3
d. 2.7
e. 3.8
D
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Two types of cholesterol are found in human blood, HDL and LDL. Clinical studies have shown that
the risk of coronary heart disease is greatest for a person with a ____ level of HDL in their blood and a ____ level of LDL in their blood.
a. high; low b. low; low c. low; high d. low; moderate e. moderate; moderate
As unwinding of the helix occurs during DNA replication, tension is created ahead of the replication fork. Describe the nature of this tension and state the manner in which it is resolved
What will be an ideal response?
Classification. The following are important terms relating to water's special properties. Answer the questions below by matching the descriptions with the most appropriate word.
A. Property of nonpolar compounds B. Property of NaCl that enables it to dissolve in water C. A compound that releases ions when dissolved in water D. NaCl becomes this in solution E. A liquid that dissolves other substances
Molecular mutualism is:
a. an interaction of molecules that disrupts hypercycles. b. an interaction of two species to the benefit of both. c. replication of RNA by another enzyme. d. an interaction of molecules that increases the replication of each other.