Bio 1400 (Exam Questions Well Answered Rated A+) #3 Practice Questions With Answers

In which of the following types of cleavage patterns does each cell have the capacity to develop into a complete embryo ? a) determinate cleavage b) indeterminate cleavage c) spiral cleavage {Ans: b) indeterminate cleavage}Which gradient (s) is/are directly responsible for producing membrane potentials ? 1. concentration gradient 2. pressure gradient 3. partial pressure gradient 4. electrical gradient {Ans: b) 1. concentration gradient and 4. electrical gradient}What should animals with radial symmetry be better able to do than those with bilateral symmetry ? a) move quickly in one direction b) detect threats from above or below equally well c) deal effectively with food distributed homogeneously in 360 d) focus attention in a single direction {Ans: c) deal effectively with food distributed homogeneously in 360}Which of the following phyla have a water vascular system ? a) molluscs b) echinoderms c) cnidarians d) annelids e) arthropods {Ans: b) echinoderms}The formation of the fertilization membrane and the slow block to polyspermy are dependent on a) the entrance of potassium ions into the egg b) the departure of sodium ions from the egg c) the entrance of calcium ions into the egg d) the departure of hydrogen ions from the