Which of the following was first produced commercially using recombinant DNA technology?
A. hepatitis B vaccine
B. interleukins
C. human insulin
D. human growth hormone
Answer: C
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It is believed that the coelacanths and lungfish represent a crucial link between other fishes and tetrapods. What is the major feature in these fish in support of this hypothesis?
A) Like amphibians, they are tied to the water for reproduction. B) Their fins have skeletal and muscular structures similar to amphibian limbs. C) They have highly evolved nervous and circulatory systems. D) They have lungs and are able to breathe air when water is scarce. E) They enter a hibernative stage when food is scarce, as many tetrapods do.
Synergist muscles are used to
a. support and stabilize other muscles. b. antagonize muscle groups. c. replace damaged muscles. d. move body parts. e. support organs.
Nuclear division in which the chromosome number is reduced from 2n to n is part of the lifecycle of all of the following organisms except
A. Molds B. Ferns C. Insects D. Bacteria E. Protozoans
A major difficulty facing systematists is
A) sequencing DNA. B) distinguishing similar features due to common ancestry from those due to convergent evolution. C) distinguishing anatomy from physiology in plant evolution. D) understanding the sequence of cell divisions in the early embryology of plants and animals. E) placing specimens into the predefined taxonomic categories of species and genus.