1. You are interested in the microbial count in some yogurt you bought from the grocery store. However, the only dilution vessels you have available are 500 milliliter buckets. You weight 5 g and add it to 95 ml of saline, making 100 ml of yogurt slurry. 5 ml of this mixture is then added to 95 ml of saline. This is repeated again one more time. Finally, 1 ml of this sample is added to 30 mL of nutrient agar and poured into a petri dish. You count 231 colonies. Determine the total cell count in CFU/g of the original yogurt.

4. how does a phospholipid behave in water? the phosphate head does not mix with water; the fatty acid tails do. the phosphate head and the fatty acid tails mix with water. the phosphate head and the fatty acid tails do not mix with water. the phosphate head mixes with water; the fatty acid tails do not.

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.