PART VIII: PCAT PRACTICE TEST in VS .NET

Drawer Data Matrix in VS .NET PART VIII: PCAT PRACTICE TEST

PART VIII: PCAT PRACTICE TEST
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PART VIII: PCAT PRACTICE TEST
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neuron, where it will ultimately coerce the release of neurotransmitters to the synapse Blockage of the Na+ channels would essentially keep the neuron in resting potential, where Na+ is restricted outside the neuron This eliminates choice A Choice C alleges that blocking Na+ channels would in some way interfere with Na+/K+ pumps which are used for the maintenance of resting potential Since Na+ channels are only needed to initiate an action potential, this choice can be eliminated Neurotransmitters are not released until an action potential has made its way down the length of the neurons so choice D can also be eliminated This leaves us with choice B Blocking Na+ channels prevents the initiation of the action potential, or depolarization, of the membrane 13 Answer: D The question explains that AZT and ddI interfere with replication and transcription During a viral infection, the ideal situation would be to interfere with viral processes while leaving host cell processes unaffected Choice A suggests that host cell DNA replication should be prevented in order to keep the host cell from functioning and mentions nothing about how this would affect the virus Choice B is similar in that it does not mention how the virus would be affected Choice C is not appropriate because it discusses preventing infection If the patient is already con rmed as infected, then this choice wouldn t make sense If a person is infected with HIV, then the viral genetic material has already entered the host cells If replication of the viral genome can be prevented as suggested by choice D, then the progression of the infection can be slowed 14 Answer: B The question describes a system of gene regulation using repressors Since the organism described is bacterial, and the question is asking about gene regulation, this should narrow the choices to operons Since the enzymes produced in this question are only used when the antibiotic tetracycline is present, this would be an example of an inducible operon 15 Answer: C This problem requires a Punnett square to be performed for each generation For the rst generation, the Punnett square for the genetic cross of TT tt should be performed In the rst generation, the T and t gametes unite to produce individuals with a Tt (heterozygous) genotype In the second generation, the Punnett square is conducted for the genetic cross of TT Tt or:
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T T t TT Tt
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The phenotypic results from this cross are that three of the four pea plants will be tall (TT, Tt, and Tt) and one of the four is short (tt) Thus, the phenotypic ratio of dominant to recessive pea plants is 3:1 16 Answer: B In the proximal convoluted tubule the primary events are the reabsorption of nutrients and water There are two regions in the nephron where large amounts of sodium and water are reabsorbed In the loop of Henle the countercurrent multiplier system is used which leads to salts (sodium and chloride) and water being reabsorbed In the distal convoluted tubule, the hormone aldosterone in uences the reabsorption of salts and water follows by osmosis 17 Answer: C This question is simply asking for how carbon dioxide is produced on the cellular level Choice D can be eliminated because carbon dioxide is not directly produced from oxygen gas in the cells You should recall your knowledge of the process of cellular respiration During aerobic respiration, glucose goes through glycolysis, the Krebs cycle, and the electron transport chain During the Krebs cycle, carbon dioxide is released Therefore carbon dioxide is formed in the cells as a by-product of glucose metabolism Protein synthesis and nucleic acid metabolism do not produce carbon dioxide as by-products 18 Answer: C To answer this question you need to be familiar with methods of bacterial gene transfer Since the question says that a plasmid is being transferred, this would indicate that conjugation is the most likely method Transformation involves taking up excess DNA from the environment and transduction involves bacteriophage transfer Binary ssion is normal bacterial cell division 19 Answer: C This question is about osmotic effects The process of dialysis needs to remove excess uids (water) from the blood In order to do this, the dialysis uid must have more solutes and less water than the blood This would mean that the dialysis uid must be hypertonic compared to the blood Another way to say this is that the blood must be hypotonic (contain less solutes and more water) compared to the dialysis uid (choice C) If the patient s blood was isotonic to the dialysis uid, there would be no net movement of water and if the blood were hypertonic to the dialysis uid then water would enter the blood In this example, pH is not a major factor in determining osmotic effects, so choice D can be eliminated 20 Answer: C A codon is a sequence of three nucleotides found on the mRNA that speci es particular amino acids to be added to a protein The genetic code lists all possible codons One codon always speci es one amino acid If the protein is 1480 amino acids long, we might suspect that the mRNA had 1480 codons However, there would be an additional codon present that served as the stop codon The stop codon does not code for an amino acid, but instead signals the end of translation and the release of the protein Therefore 1481 codons would be present on the mRNA
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