Which of the following is thought to be the FIRST group of organisms able to use water as an electron donor in photosynthesis?
A. land plants
B. cyanobacteria
C. algae
D. aquatic plants
Answer: B. cyanobacteria
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Denaturation of proteins may result in all of the
following EXCEPT a. breakage of hydrogen bonds. b. loss of three-dimensional structure. c. removal of R groups from amino acids. d. alteration of enzyme activity. e. endangerment of a cell’s life.
What is the main difference between amphibians and reptiles?
A. Reptiles are tied to water for reproduction, while amphibians have amniotic eggs that can survive on dry land. B. Amphibians are tied to water for reproduction, while reptiles have amniotic eggs that can survive on dry land. C. Neither are tied to water for reproduction. D. There is little difference between amphibians and reptiles.
In which vessel is the velocity of blood flow the lowest?
a. Vena cava b. Left ventricle c. Pulmonary vein d. Right atrium e. Pulmonary capillaries
Based on their experiment with T2 bacteriophages, Hershey and Chase concluded that
A. virulent bacteria can transform nonvirulent bacteria. B. the phage coat contains the genetic material. C. DNA replication is semiconservative. D. A always pairs with T and G always pairs with C. E. DNA functions as the genetic material.