The first and best-known DNA amplification technique is ________.
A) the polymerase chain reaction
B) Okazaki synthesis
C) Sanger sequencing
D) next-generation sequencing
A) the polymerase chain reaction
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Which contraceptive method is the most effective form of birth control?
a. condoms b. diaphragms c. abstinence d. oral contraceptives e. vasectomy
The activities of cells in different layers of the tubular gastrointestinal tract are regulated by clusters of nerves located in the submucosa. These nerve complexes are called
A. villi. B. serosa. C. epithelia. D. plexuses. E. muscularis.
Which of the following is incorrect about inflammation?
A. Fever could be beneficial to inhibiting the pathogen. B. Serotonin causes smooth muscle contraction. C. Inflammation can last hours to years. D. Pyrogens cause vasodilation and increased capillary permeability. E. Basophils and mast cells release histamine.
The first land plants were bryophytes, which then branched into ferns, gymnosperms, and finally angiosperms. What advantage did gymnosperms have over ferns?
a. Gymnosperms produce pollen and do not require water to reproduce b. Gymnosperms go through alternation of generations c. Gymnosperms have a vascular system, which allowed them to grow taller d. The gymnosperms can grow larger gametophytes e. Gymnosperms can produce flowers and fruits to aid in seed dispersal