You are tasked with determining the number of (culturable) bacteria in soil collected from the community garden. You perform the dilution scheme below. How many bacteria are there in 1 gram of soil? Use the space below to show your work.

You are handed a streak plate and asked to provide an estimate of the number of bacteria in an individual colony. You are told that colonies typically contain 107-109 bacterial cells.

Design a dilution scheme that would enable you to estimate the number of bacteria in the colony using the quantitative plate count approach. Draw your dilution scheme below, including all plates, tubes, and volumes. Be sure to indicate which tubes would be plated (and the amount plated). Indicate the IDF and TDF for each tube.

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days, followed by 7 days when no hormones are ingested. which of the following statements most accurately describes the effects of birth-control pills? -birth-control pills maintain constant levels of estrogens and/or progesterone so there is no surge in lh and ovulation does not occur.-birth-control pills inhibit the development of the uterine lining so implantation of a fertilized oocyte cannot occur.-birth-control pills maintain constant levels of estrogens and/or progesterones and mask the release of the oocyte from the follicle.-the 7 days with no hormones does not allow a thick enough uterine lining to form so a fertilized oocyte cannot implant.