Imagine you are introducing the lac operon and the trp operon to students who have never learned about it before. Complete the table to compare the similarities and differences between the two operons.

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

Which image shows labeled organelles that are present only in plant cells?