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• 69. Which phrase defines smooth muscle? (A) used for slow, involuntary movements；(B) used to move bo
• 70. The systems that coordinate communication are__? (A) skeletal and muscular；(B) circulatory and r
• 71. Which of the following best describes how a neuron fires? (A) Na+ ions cross the plasma membrane
• 72. If you had a friend who was unable to see color, you would expect that your friend's eyes h
• 73. Observing a patient who has been given an experimental drug, you notice that it constricts blood
• 74. A fast-twitch muscle fiber__? (A) uses ATP quickly in short, fast contractions；(B) has many capi
• 75. Systolic pressure reflects the__? (A) contraction of the atria；(B) relaxation of the atria；(C) c
• 76. People are often noted to pick up and \"adopt\" a baby wild animal, which then leads
• 77. An ecosystem is defined as__? (A) all of the individuals of the same species living in an area；
• 78. Which of the following is not a type of symbiosis? (A) predation；(B) mutualism；(C) commensalism；
• 79. Why do populations that fragment in response to climate changes face a higher risk of extinction
• 80. How does damming or altering the path of a river destroy wetlands? (A) Fish can no longer migrat
• 33. What is the definition of the constant Km of the Michaelis-Menten equation in enzyme kinetics? (
• 34. Which amino acid has an indole ring? (A) Asn (B) Trp (C) Lys (D) Pro
• 35. What is the primary mean by which the activity of allosteric enzymes? (A) Cleavage of zymogens (
• 36. Which amino acid significantly affects the tertiary structure of the protein? (A) Asn (B) Trp (C
• 37. What is zymogen? (A) Enzymes that are synthesized as inactive precursors and activated by cleava
• 38. Which amino acid plays a key role in N-linked glycosylation? (N-glycans are attached to the nitr
• 39. Which of the following is a polysaccharide that serves as a structural component in the exoskele
• 40. Which of the following characteristics describe glycoproteins? (A) Proteins with covalently atta
• 41. What is the difference between RNA and DNA? (A) RNA contains thymine, while DNA contains uracil
• 42. How are nucleotides joined together to form nucleic acids? (A) By covalent bonds between the pho
• 43. Which of the following aqueous solutions has the lowest pH? The solutions have H+ concentration
• 44. What is a method for routine DNA sequencing of gene segments? (A) Polymerase chain reaction (PCR
• 45. What is the role of adenosine triphosphate (ATP) in cells? (A) It is a cofactor for enzyme catal