22. Exchange of genetic material in ciliates is known as:
(A)macronucleosis
(B)micronucleosis
(C)conjugation
(D)panmixis
(E)myxomycetosis

18. A species that is naturally found only in a particular location is called (A)extinct. (B)endemic. (C)extinct due to the action of humans. (D)exotic. (E)transitional.

19. If goats are crossed with sheep, embryos will form but cease development and spontaneously abort. This is an example of (A)a prezygotic mechanism. (B)hybrid inviability. (C)hybrid sterility. (D)hybrid breakdown. (E)spermatic behavior.

20. The photosynthetic activity of cyanobacteria takes place in their: (A)thylakoids (B)chloroplast (C)pili (D)vesicles (E)vibrios 

21. Which of following is NOT true? (A)Melatonin regulates functions related to light and to seasons marked by changes in day length. (B)Vitamin D actvation begins in the kidneys and is completed in the liver. (C)Prolactin regulates fat metabolism in birds. (D)Humans require thyroid hormones for the normal function of bone-forming cells. (E)In mammals, melanocyte-stimulating hormone (MSH) functions in hunger and metabolism in addition to coloration.

23. The phloem: (A)transports water from the roots to the stems and leaves (B)transports food between the leaves and the roots (C)transports minerals from the roots to the stems and leaves (D)transports carbon dioxide from the leaves to the stems and roots (E)All of the other choices provided are correct

24. Endosperm is found in: (A)angiosperms (B)gymnosperms (C)ferns (D)mosses (E)horsetails

25. The cell walls of fungi are composed of: (A)chitin (B)cellulose (C)dentine (D)peptides (E)glycerol

26. The putative ancestor of animals was: (A)choanoflagellates (B)chytrids (C)gnetophytes (D)stramenopiles (E)euglenozoa

27. It is possible to make a form of nitrogen that is useable by plants; however, the major drawback to this process is: (A)time involved (B)getting enough nitrogen (C)cost of converting nitrogen to a useable form (D)temperatures must be extremely high (E)it is difficult to contain the end product 

28. Collagen is a tough, stretch-resistant protein. You would be most likely to find collagen in which type of tissue? (A)nervous (B)muscular (C)epithelial (D)connective (E)epithelial and connective tissue