find the number of ways of forming an executive committee of four in a social committee consisting of 15 members if a particular man must be in the committee.

Color blindness is a recessive trait. the gene for color blindness is on the x chromosome. the family tree below shows the trait of color blindness. the only unknown is the mother in the first generation

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .