Aminoacyl-tRNA synthetase catalyzes the reaction between the appropriate amino acid and ATP to form an activated amino acid: amino acid + ATP ? aminoacyl-AMP + P-P
Indicate whether the statement is true or false.
Answer: TRUE
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Action potentials never vary in magnitude along a particular excitable membrane
Indicate whether the statement is true or false.
Which feature of cycads distinguishes them from most other gymnosperms?
1. They have exposed ovules. 2. They have flagellated sperm. 3. They are pollinated by animals. A) 1 only B) 2 only C) 3 only D) 2 and 3
Which of the following pairs is incorrectly matched for cells and the molecules they secrete?
A. Mast cells; histamine B. Natural killer cells; toxic chemicals C. Eosinophils; toxic chemicals D. Neutrophils; heparin E. Basophils; heparin
Vaccinations are given to humans to minimize the spread of ALL of the following diseases EXCEPT
a. brucellosis. b. diphtheria. c. tetanus. d. whooping cough.