Which one of the following correctly describes the way in which DNA works?
A. DNA makes RNA and RNA changes into protein.
B. DNA makes amino acids which form ribosomes.
C. DNA makes mRNA which directs where tRNA places amino acids.
D. DNA makes mRNA which manufactures amino acids which attach to tRNA.
C. DNA makes mRNA which directs where tRNA places amino acids.
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Visceral pain is a response to
a. muscle spasms. b. muscle fatigue. c. inadequate blood flow to organs. d. severe chemical stimulation. e. any of these.
The layers of connective tissue that protect the brain are the
a. meninges. b. epithelial segments. c. palisade layers. d. xylem. e. cambium layers.
Quantitative inhibitors
A) are produced in small quantities by a plant. B) are toxic to herbivores. C) reduce digestibility of plant material. D) include cyanide and alkaloids.
Smooth muscle has all of the following characteristics except:a
being attached to bones via tendons. b. having sustained contractions. c. requiring less ATP to maintain a high level of force. d. contracting slowly. e. having muscle fibers capable of greater shortening than striated muscle.