In a biology lab you are given a lancelet to dissect. During the dissection you observe a flexible rod of nerve cells, extending along its back to its tail. Based on this observation, you can place it in the phylum
A. Chordata.
B. Arthropoda.
C. Cnidaria.
D. Echinodermata.
E. Nematoda.
A. Chordata.
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Based on the figure above, showing fetal (A) and adult (B) oxygen-hemoglobin saturation curves, which of the following conclusions is true?
A) The mother binds oxygen with greater affinity than the fetus. B) Adult saturation occurs at lower partial pressures of oxygen than fetal saturation does. C) At 50 percent saturation, fetal blood will have a higher affinity for oxygen than adult blood will. D) As the partial pressure of oxygen increases, adult hemoglobin approaches saturation faster than fetal hemoglobin does.
Which molecule represents one of the best examples of a commonly shared signaling pathway connected to memory
in invertebrates and vertebrates?
a. cyclic AMP b. cyclic GMP c. RNA cyclase d. RNA binding protein e. non-responsive binding protein
The neuromast cells are part of the system to
a. process light. b. sense electrical currents in the water. c. control balance. d. detect vibrations. e. detect dissolved chemicals.
Explain the differences between a hypothesis, law, and theory
What will be an ideal response?