The cell body of a motor neuron resides in the spinal cord, but it may control muscles a long distance away. In a giraffe, the ________ of a leg motor neuron may be six feet long!
A. soma
B. axon
C. node of Ranvier
D. dendrite
Answer: B
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Inactivation of a cell-surface receptor depends on:
A. the binding affinity of the receptor. B. the activity of phosphatases in the cytosol. C. the concentration of ligand surrounding the cell. D. both the binding affinity of the receptor and concentration of ligand surrounding the cell.
Seagrasses are important in all the following except:
a. nutrient recycling. b. providing a habitat for animals. c. stabilizing sediments. d. being consumed by most estuarine herbivores.
All of the following are examples of ribozymes or ribozyme activity except
A) peptidyl transferase activity. B) autocatalytic RNAs. C) ribonuclease P. D) intron removal from pre-rRNA. E) zymogen.
The roots of certain epiphytes are photosynthetic
____________________ Indicate whether the statement is true or false.