Usabo Practice Exam Questions (184 Terms) With Verified Definitions Updated 2024

When the base composition of DNA from bacterium Mycobacterium tuberculosis was determined, 18% of the bases were found to be adenine. What is the G + C content in M. tuberculosis? {Ans: 64%}Which of the following is NOT a characteristic of all chordates? {Ans: vertebrae}Scientists have determined that three classes of genes (named A, B, and C) control development of the four flower parts: Sepals, Petals, Stamen, and Carpels. Genes A and C mutually repress each other. Gene B is not regulated by either Genes A or C. The expression pattern of these genes in wild-type flowers is shown below, where +++ indicates gene activity. A mutation in Gene C, which prevents its expression, will result in which of the following floral patterns? (question 8 of 2005 exam) {Ans: Sepals-Petals-Petals-Sepals}The order of normal blood flow through the human heart is {Ans: right atrium, right ventricle, lungs, left atrium, left ventricle, body}If the rate constant of a first order reaction that converts substrate S into product P is 0.693 min -1 then what is the half life of the reaction? {Ans: 1.000 min}Suppose the lac repressor of E. coli is mutated so that it never binds