Blood flow velocity is inversely proportional to the pooled surface area of a structure; therefore, it is greatest in the ________ and slowest in the ________.
A) capillaries : arteries
B) arteries : capillaries
C) veins : arteries
D) arteries : veins
E) arterioles : veins
Ans: B) arteries : capillaries
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Which of the following statements about bacteriophage is false?
A. Bacteriophages do not have a viral envelope. B. A temperate phage can have its DNA integrated into the host chromosome as a prophage. C. Ultraviolet radiation can cause induction. D. A prophage is replicated with the bacterial chromosome and passed to the two new daughter cells. E. Late genes are only expressed during the lysogenic cycle.
Placoid scales are characteristic of class
a. Cephalaspidomorphi. b. Chondrichthyes. c. Osteichthyes. d. Reptilia.
Diapedesis is the movement of white blood cells through intact blood vessel walls into surrounding body tissue. It typically happens when an area of the body is injured or damaged, and an inflammation response is required. What role would you expect cell adhesion molecules to play in this process?
A. Cell adhesion molecules help white blood cells adhere to the blood vessel wall so that they can migrate across the wall and infiltrate into the underlying tissue. B. Cell adhesion molecules will allow the white blood cells to cling to one another to form a migrating clot. C. Cell adhesion molecules will allow the white blood cells to attach to the injured area so they become immobile.
The MOST likely cause of Crohn disease is:
A) autoantibody destruction of the intestinal wall. B) precancerous lesions in the lower intestinal tract. C) chronically high triglyceride levels in the blood. D) infection of the gastrointestinal tract with Helicobacter pylori.