In the roundworm Caenorhabditis elegans, development of the vulva begins when the ____ secretes ____, which then bind(s) to _____ on the _____
A. progenitor cell; EGF; the EGF receptor;
anchor cell
B. progenitor cell; transcription factors; cisregulatory
regions; anchor cell
C. anchor cell; EGF; the EGF receptor;
progenitor cell
D. anchor cell; transcription factors; cisregulatory
regions; progenitor cell
E. Type 1 cell; EGF; the EGF receptor; Type
2 cell
C
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A protein with an internal signal sequence is most likely to be located in:
A. the nucleus. B. a mitochondrion. C. the cytoplasm. D. a chloroplast. E. the extracellular space.
A nosocomial infection is
A) Always present but inapparent at the time of hospitalization. B) Always caused by medical personnel. C) Acquired during the course of hospitalization. D) Always caused by pathogenic bacteria. E) Only a result of surgery.
A cell is considered _______ if two of each type of chromosome are present inside the cell.
Fill in the blank(s) with the appropriate word(s).
One way embryonic cells can identify where they are within in an embryo is by engaging in the process of
A. cell differentiation or differential expansion B. cell proliferation C. programmed cell death D. induction from adjacent cells