Which of the following has high compliance, allowing it to hold a large volume of blood with little change in pressure?
A) vein
B) arteriole
C) artery
D) capillary
E) venule
Answer: A) vein
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Colonies of Streptococcus pneumoniae appear ?-hemolytic on blood agar media. Which one of the following statements explains this discrepancy?
a. The lot of blood agar may be expired. b. Something may be wrong with the strain of S. pneumoniae since it should be ?-hemolytic on blood agar. c. Something may be wrong with the strain of S. pneumoniae; it should be ?-hemolytic on blood agar. d. No discrepancy is present. S. pneumoniae should be ?-hemolytic on blood agar.
When two lines stem from a single branch point on a phylogenetic tree, what are they called?
a. branch points b. leaves c. sister taxa d. species
What is the number of chromosomes found in
an oak tree?
a. 2 b. 4 c. 8 d. 12 e. 24
Which statement about cell walls is true?
A. Primary walls are laid down while the cell is still growing. B. Bacteria and plants have cell walls of the same chemical composition. C. The middle lamella glues the walls of adjacent cells together. D. Cell walls are laid down inside cell membranes.