Segmentation is the subdivision of the body into segments or metameres. True segmentation is found in which of the following phyla?
A. Arthropoda, Annelida, Chordata
B. Annelida, Mollusca, Arthropoda
C. Mollusca, Chordata, Annelida
D. Arthropoda, Chordata, Porifera
E. Echinodermata, Platyhelminthes, Cnidaria
Answer: A
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a. exoskeleton b. hydrostatic c. hydrophobic d. hydrophilic e. endoskeleton
Which of the following does NOT contribute to variability of the offspring in sexual reproduction?
a) the different ways homologous can separate in Metaphase I b) crossing over in Prophase I of meiosis c) a brother and a sister producing children together d) the swapping of genetic information between homologues during meiosis e) combining genes from two unrelated parents during fertilization
What characteristic is unlikely to be associated with arctic tundra?
A. A perpetually waterlogged soil B. Rapid nutrient recycling C. One of the world’s greatest store of carbon D. Permafrost E. Cool, anaerobic conditions
Quorum sensing in Gram-positive bacteria generally involves the use of ________ as the external signaling molecules.
Fill in the blank(s) with the appropriate word(s).