Which of the following is most closely related to the lobe-finned fishes?
A. Ray-finned fishes
B. Tunicates
C. Mammals
D. Cartilaginous fishes
E. Lancelets
Answer: C
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Which of the following statements about enzymes is FALSE?
A. The active site of the enzyme is where the chemical reaction takes place. B. The substrate binds to the enzyme with low affinity. C. The enzyme undergoes a conformational change that brings substrates closer together in an induced fit. D. The optimal activity of an enzyme occurs over a narrow temperature range. E. The optimal activity of an enzyme occurs within a narrow pH range.
Young multicelled organisms usually start out small, then grow in size and increase in complexity. This process is called
a. reproduction. b. heredity. c. development. d. evolution. e. metabolism.
The function of a vector in genetic engineering is to
A. separate fragments of DNA by their length and electrical charges. B. cut DNA into many fragments. C. link together newly joined fragments of DNA. D. introduce rDNA into a host cell. E. make millions of copies of a specific segment of DNA.
Viroids infect
A. bacteria. B. plants. C. fungi. D. plants and animals. E. all organisms.