30. The following are all adaptations to life on land except
(A)cuticles
(B)tracheids
(C)seeds
(D)reduced gametophyte generation
(E)rings of cellulose-synthesizing complexes 

26. The recessive allele that causes phenylketonuria (PKU) is harmful. What maintains the presence of this harmful allele in a population's gene pool? (A)heterozygote advantage(B)diploidy(C)stabilizing selection(D)balancing selection

27. Which eukaryotic kingdom is polyphyletic, and therefore unacceptable, based on cladistics? (A)Monera(B)Protista(C)Plantae(D)Fungi(E)Animalia

28. The chloroplasts of all of the following are thought to be derived from ancestral red algae, except those of (A)golden algae(B)diatoms(C)dinoflagellates(D)green algae(E)brown algae

29. Plastids that are surrounded by more than two membranes are evidence of (A)origin of the plastids from cyanobacteria (B)fusion of plastids (C) evolution from mitochondria (D)secondary endosymbiosis (E)budding of the plastids from the nuclear envelope

31. How have fruits contributed to the success of angiosperms? (A)by nourishing the plants that make them (B)by attracting insects to the pollen inside (C) by facilitating dispersal of seeds (D)by producing triploid cells via double fertilization (E)by producing sperm and eggs inside a protective coat

32. What do fungi and arthropods have in common? (A)Both groups have cell walls. (B)Both groups are commonly coenocytic. (C) The haploid state is dominant in both groups. (D)The protective coats of both groups are made of chitin.

33. Why is the amniotic egg considered an important evolutionary breakthrough? (A)It has a shell that increases gas exchange. (B)It prolongs embryonic development. (C) It provides insulation to conserve heat. (D)It allows deposition of eggs in a terrestrial environment. (E)It allows internal fertilization to be replaced by external fertilization.

34. A plant seedling bends toward sunlight because (A)there is more auxin on the light side of the stem. (B)auxin is destroyed more quickly on the dark side of the stem. (C) auxin is found in greatest abundance on the dark side of the stem. (D)auxin migrates to the lower part of the stem due to gravity. (E)gibberellins produced at the stem tip cause phototropism.

35. Which of the following is an example of positive feedback control in homeostasis? (A)During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors. (B)Blood volume and pressure drop due to bleeding. This decreased pressure causes the kidneys to increase water reabsorption to increase blood volume and pressure. (C) Glucose levels rise following consumption of a big dessert, triggering release of insulin which causes glucose levels to fall. (D)Blood levels of glucose fall during sustained exercise, causing the release of glucagon which stimulates the release of glucose into the blood.

36. The sodium-potassium pump of neurons pumps (A)Na+ and K+ out of the cell. (B)Na+ and K+ into the cell. (C) Na+ into the cell and K+ out of the cell. (D)Na+ out of the cell and K+ into the cell.