30. Mycorrhizal association with plant roots is best described as:
(A) detrimental to the roots.
(B)only a temporary association dependent on water uptake.
(C)a symbiotic relationship between the plant and certain bacteria
(D)a fungus root interrelationship.
(E) a kind of fungal parasite on plant roots.

26. Metamerism is a characteristic feature of (A) Cnidaria. (B)Arthropoda. (C)Platyhelminthes. (D)Rotifera. (E) Nematoda.

27. The following invertebrate group most closely related to the vertebrates is the (A) Echinodermata. (B)Urochordata. (C)Cephalochordata. (D)Ophiouroidea. (E) Notochordata.

28. The leaf axillary bud could be found : (A) in the internode of the stem (B)near the terminal bud (C)between the leaf petiole and the stem (D)between the leaf petiole and the leaf blade (E) between leaflets on a compound leaf

29. The plant roots contain starch-heavy plastids known as: (A) chloroplasts (B)plastoplasts (C)chromoplasts (D)statoliths (E) strongoliths

31. The correct arrangement of flower parts from the outside to the inside is: (A) carpels, stamens, sepals, petals. (B)petals, stamens, carpels, sepals. (C)stamens, sepals, petals, carpels. (D)sepals, petals, stamens, carpels. (E) stamens, carpels, sepals, petals.

32. The release of factors by cells that influence the activity of nearby cells is referred to as: (A) autocrine signaling. (B)paracrine signaling. (C)pheromonal signaling. (D)synaptic signaling. (E) endocrine signaling.

33. The critical function of the sodium-potassium pump of neurons is to move (A) Na+ and K+ into the cell and H+ out of the cell through an antiport mechanism. (B)Na+ and K+ out of the cell. (C)Na+ and K+ into the cell. (D)Na+ out of the cell and K+ into the cell. (E) Na+ into the cell and K+ out of the cell.

34. The development of Alzheimer disease is associated with deposits of (A) beta-amyloid proteins. (B)protein kinase A. (C)myosin. (D)hemoglobin. (E) cAMP-response-element-binding protein (CREB).

35. Within the vestibular system of vertebrates, hair cells help detect movement when their cilia are bent by (A) gravity. (B)statoliths. (C)the tectorial membrane. (D)otoliths. (E) the basilar membrane.

36. What is the role of calcium in muscle contractions? (A) to break the cross-bridges as a cofactor in the hydrolysis of ATP (B)to spread the action potential through the T-tubules (C)to transmit the action potential across the neuromuscular junction (D)to bind with troponin, changing its shape so that binding sites on the actin filament are exposed (E) to re-establish the polarization of the plasma's membrane following an action potential