All of the following statements are true concerning
mycorrhizae EXCEPT that
a. the fungus may penetrate into root cells.
b. mycorrhizae increase the surface area for
absorption.
c. roots obtain minerals from the fungus.
d. the fungus provides the plant with nitrogen-rich
compounds.
e. the plant provides the fungus with sugar.
Answer: d
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The neuromuscular junction is incorrectly described in which of the following statements?
A) Neurotransmitters are stored in vesicles in the axon terminal. B) The sarcolemma is the plasma membrane of a muscle cell. C) Acetylcholine binds receptors in the synaptic cleft. D) T tubules carry action potentials into the muscle cell. E) Acetylcholine binding allows sodium ions to enter the muscle cell.
Placing a blood cell into a glass of pure water causes the cell to burst. Why does this happen?
a. There is a net movement of water, via osmosis, into the cell. b. All the water moves via osmosis out of the cell. c. Net transport of water via active transport occurs. d. Organelles cannot survive and function in pure water.
The ____ is a functional region found in certain proteins that are important in development. It consists of sixty amino
acids that form four helices. a. homeobox b. homeodomain c. homeogene d. homeochromosome e. functional group
Which of the following is necessary for DNA to make copies of itself?
A. Ribosomes must be present. B. The cell must have an abundant supply of RNA nucleotides. C. The two strands of the DNA molecule must separate. D. Chromosomes must be synapsed.