Because viruses have limited genetic material, their mutation rates are very low
Indicate whether the statement is true or false
FALSE
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Which of the following questions might be answered by using the method described?
A) How many cells are produced by the culture per hour? B) What is the length of the S phase of the cell cycle? C) When is the S chromosome synthesized? D) How many picograms of DNA are made per cell cycle? E) When do spindle fibers attach to chromosomes?
The accompanying figure shows the history of large meteorite impacts on both the earth and the moon. What is the graph's major implication for the origin of life on Earth?
A) Huge impacts make it unlikely that life arose and survived on Earth before about 3.8 billion years ago. B) Meteorites could not have brought the organic molecules that were necessary for life appear. C) The moon is considerably older than the Earth. D) Life must have originated on a different body in the solar system and been brought to Earth. E) The Oparin-Haldane model of life's origins applies to the moon as well as to the Earth.
Entamoeba histolytica can cause keratitis if it is introduced through an abrasion in the conjunctiva
Indicate whether the statement is true or false
Research on starlings indicates that young birds migrate by ________, but older birds use true ________.
A. navigation; migration B. orientation; navigation C. navigation; orientation D. migration; orientation