Bio 212 Exam 1 Practice Questions with Correct Answers

In a ______ feedback loop, effectors return internal conditions to their set-point values. negative The ability of an organism to maintain a constant internal environment even when the external environment fluctuates, is called _______. homeostasis If you start sweating on a hot day, which mechanism of heat exchange is your body using to cool you down? evaporation An endotherm can sustain higher levels of running or flying. true An endotherm is more vulnerable to predation in cold weather false In class, we discussed many examples of why a high surface area to volume ration is an advantage to organisms. In which of these circumstances would a higher surface area to volume ratio be a disadvantage? mammal outer surface in a very cold environment Would an amphibian that lacks lungs and breathes entirely through its skin likely be larger or smaller than an amphibian that has lungs? Smaller, because its larger surface area to volume ratio would allow it to perform gas exchange sufficiently through its skin alone. Which branch of biology studies how an organism's body functions? Physiology Which characteristic of a cell most influences the rate of movement of materials into and out of the cell? Surface Area You observe two females of the same species laying eggs. One female lays 100 eggs and the other female lays 1000 eggs. Which of the following is least likely given the limits of fitness trade-offs? The female laying 1000 eggs is larger than the female laying 100 eggs. As the size of a cell (or organism) increases, what happens to the surface area to volume ratio? decreases Which of the following types of muscle tissue is voluntary? Skeletal Muscles