Which statement is true?
1.Both the parasympathetic and sympathetic nervous systems send nerves to all organs.
2.The sympathetic nervous system that supplies an organ will also provide parasympathetic nerves to it.
3.The sympathetic branch can have either excitatory or inhibitory effects depending on effects from the environment.
4.The sympathetic branch of the autonomic system usually speeds up the activities of the body.
5.The parasympathetic system usually speeds up the activities of the body.
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Indicate whether the statement is true or false.
Many different structures make up a cell and have unique functions. Each cell structure is associated with a critical function in the cell. These pairings include
_____ microfilaments; cytoskeleton. _____ lysosomes; protein synthesis. _____ nucleus; DNA replication. _____cell membrane; barrier between the cell and the external environment _____ Golgi apparatus; modification, processing, and sorting of macromolecules.
Historically, scientists described the human "normal microbiota" as those organisms that could be cultured from the human body. This represents a significant underestimate because_____
a. it is unethical to use human tissue for culturing microbes b. bacteria can be counted easily, but fungi are more problematic c. many microbes are resident only on a small portion of the population d. many microbes cannot be cultured in the laboratory
Which of the following statements about DNA replication is false?
A. Synthesis of both new strands is in the 5' to 3' direction. B. The newly synthesized DNA is packaged into one nucleus, and the original DNA is packaged into another nucleus. C. Each existing strand is used as a template for making a new strand. D. The two strands are separated.