Which statement best describes enzyme function?
A) Enzymes chemically alter both the reactants and products.
B) Enzymes speed chemical reactions by lowering the activation energy.
C) Enzymes can perform catabolic reactions only.
D) One enzyme can work on thousands of different substrates.
Answer: B
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What is the osmolarity of a solution containing 3M MgCl2 and 2M glucose?
A) 5 OsM B) 8 OsM C) 11 OsM D) 10 OsM
Answer the following statements true (T) or false (F)
1) The genetic information is coded in DNA by the regular alternation of sugar and phosphate molecules. 2) A process by which large particles may be taken into the cell for food, protection of the body, or for disposing of old or dead cells is called phagocytosis. 3) The orderly sequence of the phases of mitosis is prophase, metaphase, anaphase, and telophase. 4) Diffusion is always from areas of greater to areas of lesser concentration. 5) Facilitated diffusion always requires a carrier protein.
Pain impulses are first processed in the
A. gray matter of the posterior horn. B. motor cortex of the cerebrum. C. cerebral cortex. D. dorsal root ganglion.
The brain is located in the ____ cavity
a. thoracic b. pelvic c. cranial d. spinal