A friend tells you that her husband has been feeling anxious and stressed for the past month. During this same time interval, he has had several infections, bouts of forgetfulness, and erectile dysfunction. Doctors have already checked for ulcers, cancer, blood pressure changes, and other blood irregularities, but these apparently are normal. You are an endocrinologist, so you suggest that he be tested for the most likely endocrine malfunction, which would be altered ____ levels in the blood.

A) estrogen
B) cortisol
C) calcitonin
D) melatonin
E) testosterone

In a closed circulatory system, transfers between blood and the cells of other tissues take place across ____.

A) capillaries
B) veins
C) arteries
D) lymph vessels
E) all blood vessels

What happened in an experiment where normal cultured human cells were infected with a virus that carried DNA encoding for the telomerase catalytic subunit?

A) The cells underwent more cell divisions than normal.
B) The cells underwent fewer cell divisions than normal.
C) The cells died almost immediately.
D) The cells did not express the foreign telomerase gene.
E) The cell cycle shortened.

Which of the following is NOT an adhesive molecule found in the ground substance of connective tissue?

A) Fibronectin
B) Chondronectin
C) Chondroitin sulfate
D) Osteonectin