Which of these are symbioses?
What will be an ideal response?
•Interaction 1: Schistosoma is a parasitic trematode worm. The adults live in the blood vessels of mammals and birds. It infects ~20 million humans, causing diarrhea and malaise.
•Interaction 2: Many flowering plants are pollinated by insects. The insect transfers pollen as it visits plants to feed on nectar or pollen.
•Interaction 3: Aphids are insects which feed on phloem sap of plants. They require bacteria in the genus Buchnera, which are contained within special aphid cells in the body cavity. If the bacteria are eliminated by antibiotics, the aphids fail to grow and die without producing offspring.
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Answer the following statements true (T) or false (F)
1. All enzymes are proteins. 2. Because of the abundance of ribosomes, translation is NOT an energy costly process for the cell. 3. The cells of every organism make only a few different tRNA molecules encoded by the same gene. 4. In eukaryotes, 40S and 60S combine to form a 100S ribosome.
In angiosperms, after fertilization, the triploid cell gives rise to:
a. a fertilized ovule b. a seed c. an embryo sporophyte d. endosperm e. a pollen grain
Which of the species concepts are you using when you use a field guide to identify a bird?
A. phylogenetic species concept B. biological species concept C. ecological species concept D. morphospecies concept
You have a patient who complains of pain in his joints. You ask whether he drinks much water during the day and find out he does not. You therefore suspect his nitrogenous waste is deposited in his joints after it is converted from its usual form of
A. uric acid into urea. B. urea into uric acid. C. urea into ammonia. D. uric acid into ammonia. E. ammonia into urea.