Explain the significance of Archaeopteryx as a transitional fossil in our understanding of phylogenetic relationships
What will be an ideal response?
Archaeopteryx shares a common ancestor with both dinosaurs and modern birds, and indicates that birds were derived from dinosaurs. Its phylogenetic position demonstrates that birds evolved feathers first, which was followed by muscular and skeletal modifications that enabled flight in modern birds.
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A protein becomes distributed in a gradient along the length of the egg. As development continues, orientation of this gradient determines which part of the embryo will become the front of the animal, and which will be the back. This is an example of ____
a. germ layer formation b. gastrulation c. gradient development d. embryonic induction e. gene expression
Unsaturated tails of lipids
a. are hydrophilic. b. are stable and tend to break apart. c. give the membrane a fluid quality. d. will break whenever exposed to phosphate ions. e. act as carriers.
A basal body is most closely related to a:
a. ribosome. b. thylakoid. c. centriole. d. centrosome. e. lysosome
Formation of peptide bonds between amino acids to build a polypeptide would be called
A. fermentation. B. exergonic. C. glycolysis. D. phosphorylation. E. anabolism.