Communities near benthic hydrothermal vents survive in perpetual darkness, where no photosynthesis is possible
What do the producers of this ecosystem use as an energy source?
What will be an ideal response?
ANSWER: Hydrogen sulfide from the hot water vents serves as an energy source for autotrophic
bacteria. These bacteria act as primary producers for the ecosystem, sometimes residing as
endosymbionts in larger organisms.
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Answer the following statements true (T) or false (F)
1. The plant hypersensitive response is one in which the plant is unable to defend itself against a pathogen. 2. Generally plants are unable to produce chemicals that travel throughout the plant to protect against pathogens; most defense is only in localized areas. 3. When scientists breed for genes for resistance to pathogens or herbivores they are usually limited to making mutations for this to happen. 4. Cytokinins are transported through the xylem to meristems where they aid in cell elongation.
The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called ________.
A. ribozymes B. ribosomal RNA C. transfer RNA D. messenger RNA E. primer RNA
Which of the organisms below give support for the colonial theory of animal origins?
a. Spriggina b. choanoflagellates c. Ediacarans d. trilobites e. club fungi
Phage typing is based on the fact that
A) bacteria are destroyed by viruses. B) viruses cause disease. C) bacterial viruses attack only members of a specific species. D) Staphylococcus causes infections. E) phages and bacteria are related.