Which of the following is common to the development of birds and mammals?
A) the formation of an embryonic epiblast and hypoblast
B) the formation of an embryonic trophoblast
C) the formation of an embryonic yolk plug
D) the formation of an embryonic gray crescent
A
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Describe a method used to visualize the location of a protein in a cell
What will be an ideal response?
Why do cells go through fermentation?
a. to replenish ADP b. to replenish NADH c. to replenish FAD d. to replenish O2 e. to replenish NAD+
Which of the following transgenic techniques requires ES cells to be collected from the inner blastocyst?
A) Embryonic stem cell method B) Retrovirus-mediated method C) Pronuclear injection method D) Sperm-mediated transfer method E) Plasma cell membrane fusion method
Which of the following is NOT a principle used when constructing cladograms?
A. Each cladogram branch point should have one or more shared derived characters that are common to all species above the branch point, unless the character is later modified. B. All species or higher taxa are placed on tips in a phylogenetic tree. C. All shared derived characters appear together only once in a cladogram unless they arose independently during evolution more than once. D. All species or higher taxa are placed on nodes in a phylogenetic tree.