While it is very difficult to find fossils of the earliest cells, there are some probable early cell characteristics. Four of the five answers represent possible traits that the first cells may have had. Select the exception:
a. prokaryotic
b. autotroph
c. aerobic
d. anerobic
e. hetrotroph
c
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In a long DNA molecule, each origin of replication produces a _____ with a _____ on each side
A. replication bubble; replication fork B. replication fork; replication bubble C. replication bubble; DNA ligase D. replication fork; DNA ligase E. None of the answer options are correct.
The genomes of all the microbes present in or on the human body are collectively known as the proteome
a. True b. False Indicate whether the statement is true or false
What happens at higher altitudes?
a. The concentration of oxygen decreases.
b. The concentration of carbon dioxide increases. c. The partial pressure of oxygen decreases. d. The partial pressure of carbon dioxide increases. e. There is no change in the concentration or partial pressures of atmospheric gases.
When one atom loses an electron to another atom, it results in the formation of
A. many hydrogen bonds. B. a polar covalent bond and a new molecule. C. a nonpolar covalent bond that is difficult to break. D. cations and anions that can form ionic bonds. E. a covalent bond between the two.