Organisms in which taxon are most related
Answer: Genus
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The bundle sheath in a monocot leaf
(a) is filled with intercellular space. (b) is the location of stomata. (c) is covered with a cuticle to prevent water loss. (d) functions in a manner somewhat similar to the root endodermis.
Suppose that a mutant organism is unable to make the amino acid arginine. Knowing that the metabolic pathway to production of arginine is ornithine ? citrulline ? arginosuccinate ? arginine, you test the ability of the mutant to grow in the presence of each one of these compounds, providing just one of the compounds in each of your tests. Also suppose that you find that the mutant can grow in the presence of arginosuccinate or arginine, but NOT in the presence of citrulline or ornithine. From this information, which step in the metabolic pathway do you think is blocked?
a. citrulline to arginosuccinate b. arginosuccinate to arginine c. ornithine to citrulline d. ornithine to arginosuccinate
Enzymes that are secreted out of the cell to aid in the acquisition and digestion of environmental nutrients are called ________.
Fill in the blank(s) with the appropriate word(s).
Lactose is
a. a disaccharide. b. an energy source for plants. c. a polysaccharide. d. also known as table sugar. e. a form of starch.