A single human cell encloses about 1.5 meters of DNA containing 4.5 billion base pairs. How far apart are these base pairs in the DNA?
a. 3.3 × 10^?10 nm
b. 3.3 × 10^10 nm
c. 3 × 10^9 nm
d. 300 nm
e. 0.33 nm
e
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Certain properties of water—its cohesion, surface tension, and resistance to temperature change—are all:
A. a function of the partial negative charge on the H atoms of a water molecule. B. a function of the hydrogen bonds within a water molecule. C. a function of the hydrogen bonds between water molecules. D. a function of the non-polar covalent bonds between the H and O atoms within a water molecule.
Metamorphosis is a change in form and physiology that occurs during the development of an insect.
Answer the following statement true (T) or false (F)
Which of the following situations would be MOST likely to produce a new species?
A. A group of polyploid individuals arises by an abnormal meioses. The polyploids can only produce viable offspring by mating with each other. B. Several individuals join an existing population and introduce several new, beneficial alleles. C. Several individuals colonize a new area and establish a population. Migration between the two populations is common. D. An existing species becomes subdivided by a glacier and the resulting groups remain physically isolated from each other for thousands of years. When the glacier melts, the two groups are able to interbreed. E. A volcano erupts and kills all of the frogs on an island, along with many other species. New frogs colonize the island and begin reproducing rapidly because there are no longer any frog predators.
Rising concentrations of carbon dioxide (CO2 ) in the atmosphere result in the oceans
A) becoming more acidic. B) becoming more basic. C) containing less dissolved oxygen. D) containing less dissolved carbon dioxide.