Free radicals produced during biochemical reactions can serve as carcinogens if they are NOT neutralized by
A) mutator genes.
B) growth factors.
C) antioxidants.
D) repair enzymes.
E) proto-oncogenes.
C
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Which of the following statements is NOT true of Chondrichthyans?
A. They have internal fertilization. B. They were the first vertebrates to develop teeth. C. Their buoyance is maintained partly by the oil in their livers. D. They are color blind. E. Their teeth are composed of dentine and enamel whereas the scales are made of chitin.
Which of the following is not a defense of the genitourinary tract?
A. Lysozyme B. IgA C. Mucus secretions D. IgG E. Flushing action of urine
The fossil record is biased because
a. most species we have fossils for lived on land or in shallow seas that became part of the continents. b. have very few fossils from sediments beneath the ocean even though it covers three fourths of the earth. c. most fossils come from the Northern Hemisphere because most geologists have lived and worked there. d. both most species we have fossils for lived on land or in shallow seas that became part of the continents and most fossils come from the Northern Hemisphere because most geologists have lived and worked there.. e. most species we have fossils for lived on land or in shallow seas that became part of the continents, have very few fossils from sediments beneath the ocean even though it covers three fourths of the earth, and most fossils come from the Northern Hemisphere because most geologists have lived and worked there.
Which of the following is the main component of cell membranes?
A. phospholipids B. steroids C. cholesterol D. sucrose E. triglycerides