Which of the following is not a decapod?
a. shrimp
b. lobster
c. crab
d. krill
D
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Smooth muscle differs from skeletal muscle in which of the following ways?
A. It lacks actin. B. Calcium is not involved in the contraction mechanism. C. Skeletal muscle cells are smaller. D. It lacks transverse tubules. E. None of the answers provided are correct.
It has been suggested that RNA was the first informational molecule to evolve because:a
RNA molecules are more central to modern inheritance than DNA. b. RNA molecules can catalyze a variety of biologically important reactions. c. RNA molecules degrade more slowly in solution than DNA molecules. d. RNA molecules were the first molecules synthesized by Miller and Urey. e. RNA molecules have different structures..
What results when the surfactant in the lungs is affected by smoking?
A) increased respiratory surface area B) decreased gas exchange in the alveoli C) reduced ability of hemoglobin to carry oxygen D) increased concentrations of carbon monoxide
Females of many insect species, including honeybee queens, can store gametes shed by their mating partners in _____
A) their nests B) the abdominal tract C) the uterus D) the spermatheca