In the presence of abundant iron in the cell, the iron binds IRP. The complex then binds to the IREs and
A. an increase in ferritin mRNA translation and a decrease in transferrin receptor mRNA stability
B. a decrease in transferrin receptor mRNA translation and an increase in ferritin mRNA stability.
C. an increase in ferritin and transferrin receptor mRNA translation.
D. an increase in ferritin and transferrin receptor gene transcription.
A
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Given the following sequence of genes on a chromosome, determine what change in chromosome structure occurred. (the * indicates the centromere)
before A B C D * E F G H after A B C D * E F E F G H A. Terminal deficiency B. Interstitial deficiency C. Inversion D. Gene duplication
Deoxyribose is
a. a five-carbon sugar. b. present in RNA. c. a nitrogen-containing base. d. one type of purine.
Contractions of the dome-shaped __________ and the intercostal muscles between the ribs alter the
volume of the thoracic cavity during breathing. Fill in the blank(s) with the appropriate word(s).
During exhalation,
a. the pressure in the thoracic cavity is less than the pressure within the lungs. b. the pressure in the thoracic cavity is greater than the pressure within the lungs. c. the diaphragm moves downward and becomes more flattened. d. the chest cavity volume increases. e. movement of the diaphragm is inhibited.