An actin gene in humans is 92% identical to the homologous actin gene in mice. An actin gene in humans is 80\% identical to the homologous gene in yeast . What does this say about how long ago these organisms had a common ancestor ?

Which best explains why there are 64 possible codons in the genetic code and only 20 amino acids that make protiens of living organisms on earth

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.