Briefly define what is meant by the internal validity of a research design.

7 undergraduate students were randomly selected and asked to complete a questionnaire that asked how many total marathons (26.2 miles or 42.16 kilometers) they had completed. The results were: 7, 0, 0, 0, 2, 1, 4 What is the variance for the number of marathons?  

In a Normal Distribution, what would be your percentile rank, if you were 2 standard deviations below the mean?  

Triplet base codes found in mRNA that code for different amino acids during protein synthesis are called ___________________.

Gene______________ is the process of turning genes on and off.

In prokaryotes, 100% of protein synthesis occurs in the nucleus. True or False?

____________ are changes in the nucleotide sequence of DNA.

In which phase of mitosis does the genetic material first appear as CHROMOSOMES instead of chromatin?

What of the following is mitosis and the cell cycle used for?

What type of bond holds the base pairs of DNA together?