Sponges (phylum: Porifera) are animals that possess feeding cells called collar cells. These cells have a central flagellum surrounded by a collar of microvilli. The collar filters organic matter out of the water column. Which protist shares a more recent common ancestor with the poriferans?
A. Ciliates
B. Radiolarians
C. Choanoflagellates
D. Rhodophyta
E. Myxomycota
Answer: C
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The process of cumulative causation
A) was developed by W.W. Rostow. B) leads to growth in regions affected by the backwash effect. C) involves a buildup of economic activity based on external economies and localization economies. D) critiques the core-periphery concept as meaningless in today's economically interdependent world.
Comparisons of protein similarity between species can reveal the degree of genetic kinship because
a. the number of protein variations is limited. b. specific amino acids are dictated by known nucleotide sequences in DNA. c. gel electrophoresis converts proteins to nucleotides. d. protein can be hybridized with DNA. e. DNA is made by directions stored in proteins.
In an average ecosystem, about how much energy is present in the organisms at a given trophic level compared to the organisms at the next higher trophic level?
A) a tenth as much B) half as much C) twice as much D) ten times as much
Crown gall disease in plants comes from exposure to the soil bacterium Agrobacterium tumefaciens. How is it that the tumors characteristic of the disease can persist when the bacteria are no longer found in the plant?
What will be an ideal response?