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• 23. Which of the following is not directly associated with photosystem II?(A) photophosphorylation (
• 21. A major difference in the mechanism of action between steroid and peptide hormones is that(A) st
• 22. Which of the following pairs of body systems primarily regulates the activities of the other sys
• 25. Which of the following best illustrates homeostasis?(A) All the cells of the body are about the
• 24. A man who carries an X-linked allele will pass it on to(A) all of his sons. (B) half of his sons
• 26. A technique used in molecular systematics relies on the comparison of cytochrome c in different
• 28. Which of the following is a characteristic of all organisms, but not of viruses?(A) genetic info
• 30. Which of the following statements is not true?(A) Chloroplast and mitochondria generate ATP by t
• 27. Countercurrent exchange in the gills of a fish(A) maintains a gradient that enhances diffusion.(
• 29. Researchers suspect that cytotoxic T cells are usually able to find and attack cancer cells beca
• 16. Lipids are absorbed by the ___ system.(A) urinary (B) blood vascular (C) reproductive (D) respir
• 20. DNA replication occurs in(A) meiosis. (B) mitosis. (C) G1 phase. (D) G2 phase. (E) S phase.
• 18. Which of the following is not a part of lichens?(A) fungi (B) green algae (C) brown algae (D) cy
• 31. The extinction of plants has severe consequences because:(A) plants do not have the extensive ra
• 32. A woman had several miscarriages. Her doctor suspected that a hormonal insufficiency was causing
• 33. In eukaryotes, what is the active transcription generally associated with?(A) Euchromatin only (
• 34. Which of the following can be used as a cloning vector?(A) E. coli (B) Eco RI (C) lambda phage (
• 35. Which of the following is not true of a codon?(A) It consists of three nucleotides. (B) It may c
• 36. The theory that suggests that eukaryotic organelles such as mitochondria and chloroplasts may ha
• 37. What percentage of the DNA in a typical eukaryotic cell is expressed at any given time?(A) 3-5%
• 38. What hormone is essential for a tadpole to develop into an adult frog?(A) growth hormone (B) ins
• 39. Three kinds of selection occur that cause changes in the normal distribution of phenotypes in a
• 40. In a population that is in Hardy-Weinberg equilibrium, the frequency of the allele a is 0.2. Wha
• 42. What is the important component retain the violet dye in the Gram-positive bacteria cell wall?(A
• 43. Among the invertebrates, arthropods are unique in possessing(A) a notochord. (B) open circulatio