What was the most significant research finding that resulted from the successful cloning of Dolly?
A. Cloned animals are capable of producing normal offspring.
B. The nucleus of a fully-differentiated cell can be reprogrammed to be totipotent.
C. Genetic imprinting, which occurs in adult reproductive tissue, can take months for sperm and years for eggs.
D. The key to cloning success is to pick a donor cell from very early in development.
Answer: B
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Matter is gained or lost in ecosystems. How does this occur?
A) Chemoautotrophic organisms can convert matter to energy. B) Matter can be moved from one ecosystem to another. C) Photosynthetic organisms convert solar energy to sugars. D) Detritivores convert matter to energy. E) Heterotrophs convert heat to energy.
Which of the following structures are used by bacteria, fungi, and protozoans to adhere to their host?
a. lysosomes b. flagella c. actin skeleton d. fimbrae e. capsule f. spike g. surface proteins h. slime layer
In a forest community, the layer in which most photosynthesis occurs is the
A) canopy. B) midstory. C) understory. D) forest floor.
Which of the following regarding all of the tapeworms that infect humans is TRUE?
A. They all have non-human intermediate hosts. B. The larva can directly infect humans upon contact with skin. C. Humans are the normal intermediate hosts. D. They are transmitted by insect vectors. E. They reside in the muscle tissue of the definitive host.