Which of the following is a function of RNA that is dependent on its three-dimensional structure?
A. catalytic role in translation and splicing
B. transient carrier of genetic information
C. carrier of amino acids to the site of protein synthesis
D. information storage as double-stranded RNA helices in viral genomes
E. All of these functions of RNA are dependent on its three-dimensional structure.
E
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Which of the following is a muscle tissue that pumps blood throughout the body?
A. Skeletal muscle B. Cardiac muscle C. Smooth muscle D. Endocardium
The time interval used in measuring the age of rocks is called
a. radioisotope unit. b. radiometric unit. c. radiometric life. d. radioisotope life. e. half-life.
A codon calls for the placement of an individual
A. protein. B. rRNA. C. amino acid. D. mRNA.
Four-year-old Sammy is having a temper-tantrum. In a final attempt to get his way, he yells to his mom, "I'm gonna hold my breath 'til I die!" What is the primary reason that Sammy's mom is unconcerned by this statement?
A. It is impossible for Sammy to control the contraction of his diaphragm and intercostal muscles since they are made up of smooth muscle. B. Sammy is too young to hold his breath for more than 30 seconds. C. As Sammy holds his breath, the increasing levels of carbon dioxide in his blood will lead to stimulation of the respiratory control center in his brain. D. As Sammy holds his breath, the decreasing levels of oxygen in his blood will lead to stimulation of the respiratory control center in his brain.