A researcher claims that some bacteria contain factors that influence the function of a particular enzyme but other bacteria do not. To test the claim experimentally, the researcher will grow two different bacterial strains in separate liquid cultures and isolate the contents of the cells in each culture. The researcher will add different combinations of cellular contents, substrate, and enzyme to test tubes containing a buffer solution adjusted to the optimal pH of the enzyme and then measure the rate of product formation. The design of the researcher’s experiment is presented in Table 1. Table 1. An experiment for investigating the influence of bacterial factors on enzyme function Test Tube Source of Cellular Contents Cellular Contents Added Substrate Added Enzyme Added 1 Strain 1 No Yes Yes 2 Strain 1 Yes No Yes 3 Strain 1 Yes Yes No 4 Strain 1 Yes Yes Yes 5 Strain 2 No Yes Yes 6 Strain 2 Yes No Yes 7 Strain 2 Yes Yes No 8 Strain 2 Yes Yes Yes Which of the following statements best justifies the inclusion of test tubes 3 and 7 in the experiment?

Take a picture of your work to email me for possible partial credit: How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling point, if its ΔHvap is 31.6 kJ/mol?

Which of the following normally leads to the production of functional messenger RNA in eukaryotic cells?

Which of the following is involved in regulating gene expression in prokaryotes, but not in eukaryotes?

Process in which CO2, is released as a by-product of oxidation-reduction reactions

How many applicants have experience in at least two areas?

ATP serves as a common energy source for organisms because

How many applicants have computer programming or marketing experience?

The sequence 5′-GAACUT-3′ may be found in which of the following?

A student placed 20 tobacco seeds of the same species on moist paper towels in each of two petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to the light and examined again at 14 days. The following data were obtained. According to the results of this experiment, germination of tobacco seeds during the first week is