Which of the following is a correct comparison of bacterial and eukaryotic chromosomes?
A. Both have a single replication origin.
B. Only eukaryotes have specific sequences necessary for DNA distribution during cell division.
C. Eukaryotes usually have circular chromosomes; bacteria have linear.
D. Both have multiple replication origins.
E. Bacteria have circular chromosomes; eukaryotes have linear.
E
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A lysosomal enzyme works best at a pH of:
A. 3 B. 5 C. 7 D. 8
When Melvin Calvin and Andrew Benson reduced the CO2 available to cells in the photosynthesis
experiments, they discovered that RuBP accumulated. Why did this molecule accumulate?
a. There wasn't sufficient light to drive photosynthesis. b. The cells had too little ATP. c. There were not enough reactants to generate 3PGA. d. The RuBP was defective in structure and unable to form a bond with CO2. e. Rubisco was inhibited by the RuBP excess.
Which of the following do(es) not depend directly on sunlight for energy?
I. producers (plants) II. consumers (animals) III. decomposers (bacteria) a. I only b. II and III only c. II only d. III only e. I and III only
Which of the following steps in the folic acid synthesis pathway is specifically inhibited by sulfonamides?
A) the conversion of tetrahydrofolic acid to PABA B) the conversion of PABA to dihydrofolic acid C) the conversion of dihydrofolic acid to tetrahydrofolic acid D) the conversion of PABA to tetrahydrofolic acid E) the conversion of dihydrofolic acid to PABA