Mcat Biology Question Pack 1 Already Passed

What is the net volume of fresh air that enters the alveoli each minute, assuming that the breathing rate is 10 breaths/min, the tidal volume is 800 mL/breath and the nonalveolar respiratory system volume (dead space) is 150 mL? A) 65 mL B) 95 mL C) 6500 mL D) 7850 mL {Ans: C) 6500 mL The amount of air entering the lungs in a single breath, or tidal volume, is given as 800 mL/breath but of that only 650 mL reaches the alveoli per breath (800-150 mL). Therefore the net volume of air that reaches the alveoli each minute is equal to 650 mL/breath multiplied by 10 breaths/min, or 6500 mL.}The two primary factors that determine the level of blood pressure are: A) the blood concentration of L-NMMA and norepinephrine. B) the cardiac output and the resistance to blood flow. C) the blood volume and the amount of L-arginine in the diet D) the heart rate (heart beats/minute) and the cardiac stroke volume {Ans: B) the cardiac output and the resistance to blood flow.}A double-stranded DNA molecule contains bases with a ratio of (A+T)/(G+C) = 3:1. This molecule is replicated with DNA polymerase in the presence of the