A sample of DNA is collected from an organism. It is analyzed and determined that 10% of the DNA is made up of the base adenine. Based on this information, which of the following correctly lists the amounts of the three remaining bases for this sample? 10% cytosine, 10% thymine, 10% guanine
40% cytosine, 10% thymine, 40% guanine
10% cytosine, 30% thymine, 40% guanine
40% cytosine, 40% thymine, 10% guanine

1. beginning with all chambers of the heart in the "relaxed" phase, describe the cardiac cycle in mammals, with systole and diastole of the atria and ventricles. for each time point in the cycle you select, state the following: • whether the atria and ventricles are contracting or relaxing • whether the av valves and semilunar valves are closed or open • whether the pressure in the atria and ventricles is high or low