As each codon arrives at the active site of a ribosome, it attracts another molecule containing the anticodon. This molecule is called
A) DNA.
B) mRNA.
C) rRNA.
D) tRNA.
E) RER.
Answer: D
You might also like to view...
What hormone reduces blood pressure and blood volume by inhibiting nearly all events that promote vasoconstriction and sodium ion and water retention?
A) ADH B) aldosterone C) atrial natriuretic peptide D) thyroxine
The number of __________ typically increases in response to bacterial infections.
A. basophils B. monocytes C. erythrocytes D. eosinophils E. neutrophils
A premature baby born at 27 weeks gestation is suffering from respiratory distress syndrome. What is the probable cause?
A. The foramen ovale failed to close at birth. B. Fluid in the lungs was not adequately reabsorbed by the blood and lymphatic capillaries. C. The alveoli are not adequately developed by 27 weeks. D. The breath was not vigorous enough to pop open the alveoli. E. There is not enough surfactant to keep the alveoli from collapsing.
A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO2 drops to 50 mm Hg. What other change would occur?
A) increase in alveolar PCO2 B) decrease in pH of cerebrospinal fluid C) decrease in arterial PCO2 D) decrease in arterial pH E) hypoventilation