Which of the following is an example of a triploblast?
a. A sea anemone
b. A goat
c. A sponge
d. A sea star
b. A goat
A goat is an example of a triploblast. Animals that exhibit bilateral symmetry, like a goat, have three germ layers during embryonic development. The sea anemone and sea star exhibit radial symmetry, and the sponge is asymmetrical; all three are diploblasts.
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A particular reaction has a negative delta G. However, this reaction takes many years to proceed in the absence of enzyme. Why is this the case?
A. This reaction does not obey the second law of thermodynamics B. This reaction does not proceed spontaneously C. The initial free energy of the reactants is much less than the final free energy of the products D. A certain amount of activation energy is required for the reaction to proceed
Which of the following were key events in the evolution of vascular plant leaves? Select all correct choices
A. the conversion of stems (or branches) to flattened structures B. the development of apical meristem identity genes C. the development of leaf meristematic cells D. the development of leaf identity genes
When different species closely interact for an extended period of time and develop new adaptations in response to each other, it is called
A) gene flow. B) genetic drift. C) sexual selection. D) stabilizing selection. E) coevolution.
The polymerase chain reaction (PCR) uses ________, nucleotides, and a heat-resistant DNA polymerase to rapidly increase the number of molecules of a DNA fragment.
Fill in the blank(s) with the appropriate word(s).