Oxygen moves from alveoli to the bloodstream
a. because the concentration of oxygen is greater in alveoli than in the blood.
b. mainly due to the activity of carbonic anhydrase in the red blood cells.
c. by using the assistance of carbaminohemoglobin.
d. through active transport.
e. because the concentration of carbon dioxide is greater in alveoli than in the blood.
A
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a. hypertonic b. hypotonic c. isotonic d. none of these
Small RNAs can regulate gene expression. One type, called micro RNA (miRNA), acts by binding directly to
A. mRNA to prevent transcription. B. tRNA to prevent transcription. C. mRNA to prevent translation. D. tRNA to prevent translation.
Often when a person is admitted to the hospital, an intravenous solution of normal saline is begun. Since this does not harm the patient, what is the tonicity of normal saline compared to your blood?
A. hypertonic B. hypotonic C. isotonic D. osmotonic E. pretonic
Temperature and relative humidity are important intrinsic factors in determining the rate of food spoilage.
Answer the following statement true (T) or false (F)