Which of these four gene parts should allow the construction of the most accurate phylogenetic tree, assuming that this is the only part of the gene that has acted as a reliable molecular clock?
A) Intron I
B) Exon I
C) Intron VI
D) Exon V
C
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What would need to change to allow sodium and potassium ions to easily diffuse through plasma membranes?
A. They would have to shrink in size. B. The low solubility that they have in lipids would have to increase. C. The high solubility that they have in lipids would have to decrease. D. The high solubility that they have in water would have to decrease. E. The low solubility that they have in lipids would have to increase, and the high solubility that they have in water would have to decrease.
A structure whose secretions cause the uterine endometrial tissue to thicken in preparation for
pregnancy is indicated by the label
a. 1. b. 2. c. 3. d. 5. e. 7.
Which of the following does NOT act to maintain the
osmotic gradient necessary for the concentration of urine in mammals? a. countercurrent flow at the loop of Henle b. decreased hypothalamic signals leading to a decrease in ADH production c. impermeability of the descending limb of the loop of Henle to Na+, Cl-, and other solutes d. impermeability of the ascending limb of the loop of Henle to water e. all of these
mRNA is made in the ribosome.
A. True B. False