A DNA specimen that contains 30% guanine has ________ thymine.
A. 15%.
B. 20%.
C. 30%.
D. 60%.
E. The amount of thymine cannot be determined.
B. 20%.
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A segment of DNA that specifies a sequence of amino acids in a polypeptide is called a(n)
a. codon. b. intron. c. messenger. d. gene. e. enzyme
The CFTR protein product is responsible for:a
pumping chloride ions out of the cell. b. pumping water out of the cell. c. pumping chloride ions into the cell. d. fighting off bacterial infections. e. regulating gene expression
The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the ________.
A. small intestine B. liver C. large intestine D. kidney E. pancreas
The archenteron of the developing frog eventually develops into which structure?
A) reproductive organs B) the blastocoel C) heart and lung D) digestive tract E) brain and spinal cord