Why would the presence of a specific type of keratin, an intermediate filament protein, in the bloodstream or lymph node be an indicator of metastasis of tumor cells?
A. Intermediate filaments are only found in
tumor cells.
B. Keratin is only present if its specific cell
type is also present.
C. Intermediate filament proteins cause cells
to clump together.
D. Answers b and c are both correct.
B
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Many benthic organisms are dependent upon the neritic area to:
a. complete their life history cycle with juveniles as part of the plankton. b. provide plankton for food. c. protect them from desiccation and UV radiation. d. both a and b
Which of the following is not one of the intermediates or products of the carbon fixation reactions?
a. NADPH b. phosphogylcerate (PGA) c. glyceraldehyde 3-phosphate d. glucose e. ribulose bisphosphate
Oxytocin from the mother's pituitary gland targets what organ to begin contractions?
A) oviduct B) vagina C) hypothalamus D) uterus E) fimbriae
What does the nucleolus, within the nucleus, synthesize?
a. DNA b. genes c. hormones d. ribosomal RNA e. messenger RNA