The occurrence of human identical twins is evidence that:a
all human cells are totipotent.
b. no human totipotent cells have been identified.
c. the only totitpotent human cell is the one-cell embryo.
d. cells in a two-cell human embryo are totipotent.
e. cells in a two-cell human embryo are pluripotent.
d
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When a eukaryotic gene is expressed in a bacterium, the eukaryotic regulatory sequences should be maintained in order to achieve maximum expression of the gene.
Answer the following statement true (T) or false (F)
Which of the following is NOT a part of the
cell theory?
a. All organisms are cellular. b. Cells are the structural and functional units of life. c. All cells come from preexisting cells. d. All cells are approximately the same size. e. All cells have inheritable material
Which organ produces hormones that influence immune system activity?
a. brain b. kidney c. heart d. thymus e. bone
Briefly explain why allergies, such as hay fever, are characterized as a hypersensitive immune response. What will be an ideal response?