18. During ____, the atrioventricular valves are closed, the semilunar valves are open, and the blood is ejected into the aorta and pulmonary artery.

22. The T wave coincides with the electrical atrial systole

Briefly describe the process of splicing and why it is necessary for eukaryotic transcription.

If an error occurs in DNA replication which changes a T to a C, this is called…

________________ protein structure is determined by the sequence (the order) of the amino acids.

Which scientist (or scientists) used X-ray crystallography to take the first good image of DNA, which was later used to determine the structure of DNA?

An x-linked recessive trait… 

Addison’s disease is hypercortisolism as a result of an anterior pituitary tumor.

List TWO differences between the structure of DNA and the structure of RNA.

A reaction in which two molecules combine (like glucose and fructose, to make sucrose) and water is produced as a byproduct, is called a(n) ______________ reaction.