Which of the following is NOT an active form of an enzyme?
a. trypsin
b. amylase
c. pepsin
d. pepsinogen
e. chymotrypsin
D
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Which of the following is not correct concerning the initiation of bacterial replication?
A. It involves a region of the DNA called oriC B. DNA proteins bind to the DNA to begin separation of the strands C. The strands are initially separated at GC-rich regions of DNA D. Following initial separation, DNA helicase enzymes continue to unwrap the DNA
__________ is produced by the anterior lobe of the pituitary
a. Oxytocin b. Melatonin c. Growth hormone d. ADH e. Epinephrine
Which of the following methods for the transport of CO2 provides a buffering system for the blood?
a. CO2 is dissolved in the plasma. b. CO2 combines with H2O to form carbonic acid and then bicarbonate. c. CO2 combines with hemoglobin to form carboxyhemoglobin. d. CO2 is carried in small gas bubbles. e. CO2 is converted to CO for plasma transport.
All of the following types of evidence support the hypothesis that life on Earth formed spontaneously except for __________.
a. the discovery of ribozymes, showing that RNA molecules may be autocatalytic b. laboratory studies involving the formation and reproduction of vesicles c. the fossil record d. the abiotic synthesis of polymers from monomers dripped onto hot rocks e. the production of organic compounds in S. Miller's experimental apparatus.