In the endodermis, what structure allows the ions in water to enter or exit a cell?
A. Transport proteins in a cell’s cytoplasm
B. Transport proteins in a cell’s plasma membrane
C. Sugars produced in source regions
D. Organic compounds stored in plant tissues
E. Companion cells
Answer: B
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The process of denitrification involves the transformation of ________.
A. ammonia to organic matter nitrogen B. ammonia to nitrate C. nitrogen gas to ammonia D. nitrate to nitrogen gas
In a mycorrhizal association, the fungus benefits mainly by
a. absorbing water from the plant. b. using the plant roots as a growth surface. c. absorbing mineral ions from the plant. d. providing water to the plant. e. absorbing carbohydrates from the plant.
From the list below, which choice represents a correct difference between sperm production and egg production?
A) Four mature sperm are produced from one cell; one large egg is produced from one cell. B) Sperm are produced by somatic (body) cells; eggs are produced by gametes. C) Sperm are produced by mitosis; eggs are produced by meiosis. D) Sperm are produced by meiosis; eggs are produced by mitosis. E) Eight mature sperm are produced from one cell; two eggs are produced from one cell.
Gap junctions ____
a. seal the spaces between cells b. allow ions and small molecules to pass between cells c. allow plant cells to communicate with each other d. give the cell its shape e. anchor the cell membrane to the cell wall