80. A population of crayfish exhibits wide variation in body size, which is a heritable trait. A species of fish that preys on crayfish has been introduced to the population, but the fish can only eat small crayfish. Which of the following is a likely prediction about the population of crayfish in the presence of the predator? (A) The crayfish will evolve new antipredator behaviors. (B) The crayfish diet will shift to avoid competition with the fish. (C) The population will have a smaller averag {Ans: D}83. Which of the following gives the correct sequence of events in the synthesis of a protein molecule? (A) DNA, tRNA, formation of polypeptide, mRNA (B) Formation of polypeptide, tRNA, mRNA, DNA (C) tRNA, mRNA, DNA, formation of polypeptide (D) DNA, mRNA, tRNA, formation of polypeptide (E) mRNA, formation of polypeptide, DNA, tRNA {Ans: D}71. A katydid is an insect. Its leaf-like appearance is an example of (A) cryptic coloration (B) aposematic coloration (C) Müllerian mimicry (D) agonistic behavior (E) Batesian mimicry {Ans: A}75. In a particular mammal, the egg has a haploid number of 8. How many chromosomes are in the somatic cells of that organism? (A) 2 (B) 4