The organizational unit of skeletal muscle tissue is the:a
sarcoplasmic reticulum.
b. transverse tubule.
c. sarcomere.
d. Z line.
e. motor unit.
C
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The respiratory centers that control ventilation of the lungs in mammals are located in the
A. brainstem. B. hypothalamus. C. cerebral cortex. D. bronchi. E. neck.
Similar body parts are not always homologous
They may have evolved independently in separate lineages as adaptations to the same a. reproductive isolation of these groups. b. environmental pressures. c. reduced genetic variability in these groups. d. identical genes in all three groups. e. factor as all of these.
One would think that deleterious genes would be eliminated by natural selection, yet we have two human genetic
disorders with a high carrier frequency, sickle-cell anemia and cystic fibrosis. Why has this high frequency for these conditions remained in the population? What will be an ideal response?
The base G on one strand of DNA always hydrogen-bonds to a(n) ___ base on the other strand.
What will be an ideal response?