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• 13. Cells will usually divide if they receive the proper signal at a checkpoint in whichphase of the
• 18. Which of the following do you expect if an individual is heterozygous for thesickle‐cell trait?(
• 19. Hemochromatosis is an inherited disease caused by a recessive allele. If a womanand her husband,
• 20. In his work with pneumonia‐causing bacteria and mice, Griffith found that______(A)the protein co
• 21. The elongation of the leading strand during DNA synthesis(A)depends on the action of DNA polymer
• 22. The spontaneous loss of amino groups from adenine in DNA results inhypoxanthine, an uncommon bas
• 23. Which of the following is true of a codon?(A)It never codes for the same amino acid as another c
• 24. In eukaryotic cells, transcription cannot begin until_______(A)the DNA introns are removed from
• 25. Which of the following tools of DNA technology is incorrectly paired with its use?(A)reverse tra
• 26. Animals that possess homologous structures probably __________.(A)have increased genetic diversi
• 28. Which of the following is true of microevolution?(A)it is the kind of evolution that can change
• 29. Which of the following animals uses the largest percentage of its energy budgetfor homeostatic r
• 30. Which of the following would increase the rate of heat exchange between ananimal and its environ
• 31. An embryonic cell that is totipotent is one that can __________.(A)migrate into the center of th
• 27. By definition, a clade is __________.(A)parsimonious(B)polyphyletic(C)monophyletic(D)paraphyleti
• 32. When climbing a mountain, we can observe transitions in biological communitiesthat are analogous
• 34. The principle of competitive exclusion states that ________(A)competition between two species al
• 35. Food chains tend to be short because ______ (A)most producers are inedible.(B)local extinction o
• 36. Which of the following could qualify as a top‐down control on a grasslandcommunity?(A)effect of
• 37. What happens first when a phage infects a bacterial cell and is going to enter alysogenic cycle?
• 33. What are the most abundant animals found in the pelagic zone?(A)echinoderms(B)cnidarians(C)zoopl
• 38. In adult humans, short‐term memory relies on connections in the __________,whereas long‐term mem
• 39. A strawberry plant mutant that fails to make stolons would suffer from_______(A)too little miner
• 40. Injury localized to the hypothalamus would most likely disrupt_______(A)regulation of body tempe
• 41. In his breeding experiments, Mendel first crossed true‐breeding plants toproduce a second genera