Most chytrids are ____
a. saprobes in soil
b. parasites of plants
c. symbiotic partners of cattle
d. parasites of animals
e. aquatic
ANSWER: e
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The surface of the cells of some Pseudomonas species are covered in numerous threadlike structures. What is the likely reaction of such a Pseudomonas cell to the presence of a food particle?
A. Directional movement toward the food particle using a swimming motion B. Directional movement toward the food particle using a gliding motion C. Directional movement toward the food particle using an amoeboid motion D. No movement because the cell synthesizes its own food E. No movement because it is cemented in place
DNA polymerases
a. are enzymes. b. add new nucleotides to a strand. c. catalyze hydrogen bonding. d. assemble new strands in a specific direction. e. are all of these
Megadiversity countries are those countries that
A. have the greatest number of species. B. have the largest number of endemic plant species. C. have the highest ecosystem diversity. D. spend the most money on conservation. E. contain the highest genetic diversity.
Which cellular structure is correctly matched to the role it plays within the cell?
a. chloroplast?storage of enzymes b. lysosome?powerhouse of the cell c. centrosome?cell division d. plastids?structural support of the cell e. Golgi complex?production of energy