Question: A corporation has invented a new low-calorie sugar substitute. They want to determine if the substitute might be carcinogenic, so they use it in the Ames test with Salmonella his- mutants. The results show no increase in mutant bacterial colonies. They then perform feeding experiments in laboratory rats and find […]

Q1. What amount of the molecules produced in the experiment are directly of use for the cellular metabolism and cell structure found in contemporary organisms, and what is the meaning of this observation? Q2. Movement across a Membrane: listing all systems in which a number of component is based on […]

BIOL 103 6982 Introduction to Biology (2162) The theory of evolution… This is probably one of the most debated topics of the past 100 years. Did we really come from apes or are we the product of intelligent design?… This week we will delve into the topic of evolution. Now, […]

Salmonella enterica is closely related to Escherichia coli. It can be infected with the F plasmid, which can integrate into the chromosome to produce Hfr strains.These can be mated with F- E. coli to study the order and time of entry of genetic markers. The data shown here pertain to […]