During translation, the nucleotides that make up the mRNA are read in groups of three. These groups are called
A. introns.
B. anticodons.
C. exons.
D. templates.
E. codons.
Answer: E
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The insects were the first organisms to
a. show bilateral symmetry. b. exhibit segmentation. c. fly. d. develop lungs.
Experimental evidence shows that the process of glycolysis is present and virtually identical in organisms from all three domains, Archaea, Bacteria, and Eukarya. Which of the following hypotheses could be best supported by this evidence?
(A) All organisms carry out glycolysis in mitochondria. (B) Glycolysis is a universal energy-releasing process and therefore suggests a common ancestor for all forms of life. (C) Across the three domains, all organisms depend solely on the process of anaerobic respiration for ATP production. (D) The presence of glycolysis as an energy-releasing process in all organisms suggests that convergent evolution occurred.
A _________ is a circular or U-shaped ridge around the mouth, bearing either one or two rows of ciliated, hollow tentacles.
Fill in the blank(s) with the appropriate word(s).
In the pulmonary arteries, the partial pressure of oxygen is approximately ________, and hemoglobin is approximately ________ saturated with oxygen.
A) 100 mm Hg : 98% B) 40 mm Hg : 75% C) 80 mm Hg : 90% D) 25 mm Hg : 50% E) 60 mm Hg : 80%