The two primary mechanisms of cell differentiation are conditional specification and
A. fertilization.
B. gastrulation.
C. autonomous specification.
D. polar cap fusion.
E. organogenesis.
C. autonomous specification
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Ribosomes that do not anchor on the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the surface. C) have a signal peptidase error. D) do not make the appropriate anchor protein. E) all of the above
A hypothesis can best be described as a(n):
a. data point b. conclusion c. observation d. tentative explanation e. stepwise problem-solving approach
A toxin that is part of the bacterial cell is
A. A cytotonic toxin B. a cytotoxin C. an exotoxin D. an endotoxin
The retinoblastoma protein (Rb) binds to and inhibits
a. transcription factor E2F. b. oncogenes. c. cyclin-dependent kinase. d. p53.