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• 21. In which metabolic pathway does glucose-6-phosphate dehydrogenase play a key role?(A) glycogenes
• 22.Which of the following explains are the enzyme effects?(A) Enzymes release products very rapidly(
• 23. Enzymes are biological catalysts that enhance the rate of a reaction by:(A) decreasing the activ
• 24. To determine the isoelectric point of a protein, first establish that a gel:(A) contains a denat
• 25 Which of the following lipids can be formed by the methylation of phosphatidylethanolamine?(A) Ph
• 26. Which volatile short-chain fatty acid is believed to lower serum cholesterol by acting as an inh
• 27. Which of the following techniques was NOT used to determine the three-dimensional structure of(A
• 28. Which of these statements is generally true of integral membrane proteins?(A) A hydropathy plot
• 29.In a newly discovered electron transport complex a researcher has identified the redox center Fe-
• 30. Which of the following pairs of sugars are epimers of each other?(A) D-sorbose and D-fructose(B)
• 31. Which description of fungi is correct?(A) Ascomycota: Multinucleate hyphae lack septa(B) Glomero
• 32. Developmentally, which type of human tooth is most similar to ivory(象牙)?(A) incisor(B) canine(C)
• 33. How many photons are required to generate one O2 molecule during photosynthesis light reaction?(
• 34. What is the effect of a nonsense mutation in a gene?(A) It introduces a premature stop codon int
• 35 Within a cell, the amount of protein made using a given mRNA molecule depends partly on(A) the ra
• 36. Phylogenetic trees constructed from evidence from molecular systematics are based on similaritie
• 37. Imprinting has a great impact on normal mammalian development, fetal growth, metabolism and adul
• 38. CRISPR-Cas9 is adapted from a naturally occurring genome editing system that bacteria use as ani
• 39 Which of the following would you expect to be a problem for someone with nonfunctional chloridech
• 40. Plants often use changes in day length (photoperiod) to trigger events such as dormancy andflowe
• 41.Which description of the lateral line system is false?(A) The lateral line system is found in amp
• 42.Which of the following statement about the structure of sarcomeres in relaxed and contracted musc
• 43. Plant cells and animal cells both evolve specialized conduits that directly connect the cytoplas
• 44.In plants, the climacteric is a stage of fruit ripening associated with increased production of w
• 45. In humans, ABO blood types refer to glycoproteins in the membranes of red blood cells. There are