Which of the following families of DNA viruses is the most prevalent in humans?
A. Poxviridae
B. Herpesviridae
C. Adenoviridae
D. Polyomaviridae
E. Rhinoviridae
Answer: B
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While running in a garden, a girl steps on an old board and a nail goes through her shoe and skin, causing a deep
puncture wound. Which non-specific defense mechanism will aid in protecting her from pathogens?
a. ciliated epithelial cells b. lysozyme c. acidic skin secretions d. inflammation e. cytotoxic T cells
Most researchers believed that modern humans evolved from a common ancestor of
A. Proconsul. B. Homo ergaster. C. Australopithecus afarensis. D. Homo erectus. E. Australopithecus africanus.
What is the water potential of phloem relative to the water potential of the surrounding xylem?
a. lower b. higher c. about the same d. exactly the same
Which of the following occurs when there are more reactants than products for a reaction?
a. The reaction is pushed toward the reactants by the low concentration of products. b. The reaction is pulled toward generating more reactants. c. The greater concentration of reactants pushes the reaction forward, toward generating more products. d. The reaction is pulled in the forward direction by the high concentration of products.