How old was the world thought to be when Darwin began his voyage? How old is it thought to be
now? What will be an ideal response?
When Darwin left, the world was thought to be about 6000 years old and that humans had essentially
existed since the beginning. Darwin’s contemporary Lyell suggested the Earth was millions of years
old based on geological processes. We now know the Earth to be closer to four and a half billion years
old
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In cell fractionation, which cellular structure or molecule is isolated in a pellet after the first centrifugation?
a. nuclei b. mitochondria c. ribosomes d. proteins e. nucleic acids
Which atom would most likely be involved in an ionic bond?
a. hydrogen b. oxygen c. sodium d. nitrogen e. helium
What do you think would result if nitrogen-fixing cyanobacteria populations suddenly declined?
A. Populations of denitrifying bacteria would expand to take over their role, creating only a temporary disruption. B. Both the aquatic and terrestrial populations of autotrophs would collapse. C. Legumes would cease to grow, but other types of plants would be unaffected. D. More nitrogen would become available for other aquatic autotrophs. E. Aquatic primary production would decline, particularly in regions not subject to fertilizer runoff.
What will a mutant soybean plant that is unable to produce leghemoglobin most likely suffer from?
a. deficiency in magnesium b. deficiency in potassium c. deficiency in oxygen d. deficiency in nitrogen