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

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.

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

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

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

29. In negative feedback, the variable being regulated is changed in the _______ direction, while in positive feedback the variable is changed in the ________ direction. (A)same, opposite (B)decreasing, increasing (C)negative, positive (D)inhibitory, stimulatory (E)opposite, same

30. Which part of the neuron is responsible for receiving information? (A)axon (B)dendrite (C)soma (D)nucleus (E)axon hillock