Molecular clocks are usually calibrated based on
A. the date when two species diverged from a common ancestor.
B. guesses about the rates of mutations in a particular gene.
C. the first shared common ancestor for species known from the fossil record.
D. observed rates of mutation in a particular gene.
E. comparing the gene to similar genes in other kingdoms.
Answer: A
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Eukaryotic genomes are larger than prokaryotic genomes.
a. true b. false
Why are most plants green?
A) Chlorophyll a reflects green light. B) Chlorophyll a absorbs green light. C) Chlorophyll b primarily uses green light as the source of energy for photosynthesis. D) Green helps plants blend into their environment as a sort of camouflage.
Currently, atmospheric CO2 levels are approximately 400 ppm. The annual mean growth rate in CO2 is about 2 ppm/year. Assuming this trend continues, what would you predict the CO2 level to be in 100 years?
A) 100 ppm B) 200 ppm C) 600 ppm D) 1,000 ppm
When scientists placed ATP Synthase linked to fluorescent actin on a microscope slide and added ATP, the actin could be seen spinning. If the scientists instead added ADP what would happen?
A. The actin would spin when ADP is phosphorylated to form ATP. B. The actin would not spin because only ATP can move through the channel in ATP synthase. C. The actin would not spin because it required ATP hydrolysis. D. The actin would spin because ADP can also move through the channel in ATP synthase.