What basic developmental challenge is solved by the organizer?
A. enhancing migration of cells into the interior of the blastula
B. assigning developmental fates to cells along the anterior-posterior axis
C. creating an anterior-posterior axis by responding to maternally-deposited protein factors
D. creating a dorsal-ventral axis from a spherical ball of cells
D. creating a dorsal-ventral axis from a spherical ball of cells
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________ are the adhesive glycoproteins associated with most animal cells that function in calcium-mediated cell-cell recognition and adhesion.
Fill in the blank(s) with the appropriate word(s).
If the gene for telomerase is turned off in a cell, this is an indication it is a cancer cell.
Answer the following statement true (T) or false (F)
Is an individual with the XXY combination of chromosomes anatomically male or female?
A) Male B) Female
Helicases are enzymes that
A) Catalyzes the addition of new nucleotides on 5' -3' strands of DNA. B) Catalizes the sealing together of short stretches of nucleotides in discontinuous strands. C) Catalyses are breaking of hydrogen bonds between base pairs in the DNA molecules. D) Catalyses the rewinding of the two DNA molecules after replication.