Secondary succession occurs ____
a. after a fire
b. on a new sand dune
c. on bare rock
d. immediately after the formation of a man-made lake
e. on a newly-formed volcanic island
ANSWER: a
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Which heart valve is found on the right side of the heart?
a. vena cava valve b. aortic valve c. tricuspid valve d. bicuspid valve
Wild type fruit flies have red eyes. A white-eyed female fly is crossed with a red-eyed male fly. All of the females from the cross are red-eyed and all of the males are white-eyed. What type of inheritance pattern is this?
A: Sex-linked B: Autosomal recessive C: Autosomal dominant D: Incomplete dominance E: Independent assortment
All of the following contribute to a pathogen's invasiveness EXCEPT
A) toxins. B) capsules. C) cell wall components. D) hyaluronidase. E) coagulases.
Which of the following is not true of bacterial plasmids?
A. They are required for host growth and/or reproduction. B. They can replicate independently of the chromosome. C. They may carry genes that enhance survival of the bacterium under certain conditions. D. They may carry genes for drug resistance.