Only answer if you know it?
If there is a 22 nucleotide base sequence difference for a gene found in both humans and penguins, what is the estimated mutation rate for that gene (your answer should be in #of mutations per million years). Use the phylogenic tree shown and SHOW YOUR WORK.

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.

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine

The third stage of cellular respiration is (2 points)