Initiation of DNA replication occurs at each origin, but only once, until a cell proceeds through anaphase.
a. true
b. false
Answer: a. true
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. The burning of fossil fuels produces CO2, removing O2 from the atmosphere
It has been estimated that approximately three molecules of O2 are consumed by every single molecule of CO2 produced by fossil fuel combustion. Over about 20 years, a total loss of 0.0317% O2 from the atmosphere was calculated from this data. If you compare this graph to that shown in Figure 25.1, how is the trend in O2 levels related to the trend in CO2 levels? A. Both O2 levels and CO2 levels increase over time. B. Both O2 levels and CO2 levels decrease over time. C. O2 levels decrease as CO2 levels increase. D. O2 levels increase as CO2 levels decrease.
The substance that typically provides rigidity to fungal cell walls, and is also found in the external skeletons of insects
and other arthropods, is called ____.
a. lignin b. cellulose c. starch d. collagen e. chitin
Suppose that round is the dominant allele for a pea; the recessive allele produces a wrinkled pea. How can true-breeding pea plants having round peas be obtained with the least amount of work?
a. perform a testcross of the plants with wrinkled peas to determine which are true breeding b. perform a testcross on the plants with round peas to determine which are true breeding c. perform multiple crosses between plants with round peas until one emerges that seems true breeding d. perform multiple crosses betwe
Superstitions are:
a. proof that the scientific method is not perfect. b. held by some humans but not by any non-human species. c. true beliefs that have yet to be fully understood. d. just one of many possible forms of scientific thinking. e. irrational beliefs that actions not logically related to a course of events influence its outcome.