Urine has some antimicrobial effects because of its
a) flushing action.
b) alkalinity.
c) enzyme content.
d) antibody content.
Ans: a) flushing action.
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Which of the following organisms anaerobically reduces sulfates to hydrogen sulfide or metal sulfide?
A. Desulfovibrio B. Nitrosococcus C. Rhizobium D. Thiobacillus thiooxidans E. Thiobacillus ferrooxidans
Which of these features is found in both nonvascular and vascular plants?
a. lignin b. roots
c. cuticle d. xylem e. phloem
If you touch a hot stove and burn your hand, the pain isn't actually in your hand-it's in your head. What evidence can you provide to substantiate this claim?
A. Interneurons form connections directly from the burned receptor molecules to the brain. B. Motor neurons pull your hand away from the flame, signaling pain to the brain. C. Sensory neurons and interneurons carry the heat sensation to the brain where it is interpreted as painful. D. A reflex arc allows the quick response between the hand and the brain; no interpretation occurs.
The chain termination method is used in:
a. DNA sequencing. b. gel electrophoresis. c. Southern blotting. d. DNA ligation. e. polymerase chain reaction