28. The producers in aquatic ecosystems include organisms in which of the following groups?
(A) photoautotrophs
(B) plants
(C) alga
(D) cyanobacteria
(E) A, B, C, and D are all correct

24. What is the function of DNA polymerase III? (A) to rejoin the two DNA strands (one new and one old) after replication (B) to degrade damaged DNA molecules (C) to add nucleotides to the end of a growing DNA strand (D) to seal together the broken ends of DNA strands (E) to unwind the DNA helix during replication

25. Phylogenetic trees are best described as ____. (A) true and inerrant statements about evolutionary relationships (B) hypothetical portrayals of evolutionary relationships (C) the closest things to absolute certainty that modern systematics can produce (D) theories of evolution (E) the most accurate representations possible of genetic relationships among taxa

26. As cleavage continues during frog development, the size of the blastomeres ____. (A) increases as the number of the blastomeres increases (B) decreases as the number of the blastomeres increases (C) decreases as the number of the blastomeres decreases (D) increases as the number of the blastomeres stays the same (E) increases as the number of the blastomeres decreases

27. Which of the following best describes resource partitioning? (A) Two species can coevolve to share the same niche. (B) Competitive exclusion results in the success of the superior species. (C) Slight variations in niche allow similar species to coexist. (D) A climax community is reached when no new niches are available. (E) Differential resource utilization results in the decrease in species diversity.

29. Overexploitation encourages extinction and is most likely to affect ____. (A) most organisms that live in the oceans (B) terrestrial organisms more than aquatic organisms (C) edge-adapted species (D) animals that occupy a broad ecological niche (E) large animals with low intrinsic reproductive rates

30. You are observing a population of lizards when you notice that the number of adults has increased and is higher than previously observed. One explanation for such an observation would include ____. (A) increased birth rate (B) decreased emigration (C) increased emigration (D) increased immigration (E) reduction in death rate

31. Which of the following pair of hormones have antagonistic effects? (A) thyroid hormone and parathyroid hormone (B) epinephrine and norepinephrine (C) glucagon and insulin (D) prolactin and oxytocin (E) androgen and estrogen

32. Which of the following is true of members of the phylum Cnidaria? (A) They are not capable of locomotion because they lack true muscle tissue. (B) They are primarily filter feeders. (C) They have either, or both, of two body forms: mobile polyps and sessile medusae. (D) They may use a gastrovascular cavity as a hydrostatic skeleton. (E) They are the simplest organisms with a complete alimentary canal (two openings).

33. The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are in the α form. Which of the following could amylase break down? (A) glycogen, starch, and amylopectin (B) glycogen and cellulose (C) cellulose and chitin (D) starch and chitin (E) starch, amylopectin, and cellulose

34. Which of the following statements about intermediate filaments is NOT TRUE? (A) They are cytoskeletal fibers with a diameter of 8-12 nm. (B) Their constituent proteins are highly heterogeneous and express in a cell-type specific manner. (C) Their main function is to maintain cell shape and anchor organelles such as mitochondria. (D) They also express in nucleus and form nuclear lamina. (E) Vesicle can travel along intermediate filaments through interaction with motor proteins.