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Study_questions_week-1_13

A pharmaceutical drug that binds to which molecule

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46) A pharmaceutical drug that binds to which molecule (making it unavailable to a virus) would prevent the HIV virus from entering a CD4 + helper T-cell a) Reverse transcriptase b) CD4 protein c) CCR5 protein cofactor d) Both answers b & c e) None of the above 47) Adaptive evolution within a single patient’s body to the drug AZT would be slowed when, 48) In ten years HIV genes evolve, within the population of individuals infecting a single patient, to the same degree that humans have evolved in 49) Based on the data presented in class for bacteria infecting a human population, substantial resistance to a new antibiotic can be expected to occur as fast as
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50) A new influenza pandemic occurs, a) When a hybrid virus is produced that carries some genes from a farm animal virus and some from a human virus b) When humans are infected by a strain of influenza virus that normally infects birds c) When humans are infected by a strain of influenza virus that normally infects swine d) Usually at intervals of 10 to 30 years e) Both answers a & d are correct A researcher discovers a new micro-virus that has only one haploid gene. The gene is called cistron-1. It has two alleles, one (called Cistron-1-S) that codes for slow reverse-transcription, and the other (called Cistron-1-F) codes for fast reverse-transcription. 51) If an individual virus (described above) was sequenced and found to carry the allele for fast reverse- transcription, then: Use the information below for the following four questions (until you see a bar beneath the question) Two types of haploid-annual-asexual seeds ( genotype-B producing blue-flowers and genotype-R producing red-flowers) were planted during the Spring on a small remote island. Only one gene in the genome codes for flower color. The numbers of seeds planted in the Spring of generation-1 were 50 genotype-B and 150 genotype-R . The next Spring (the beginning of generation-2) all of the seeds produced from the previous year were collected and grown in a greenhouse to determine flower color. These flower colors were 300 red and 300 blue .
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