Hematopoietic tissue in bones
What will be an ideal response?
Red marrow is found within trabecular cavities of spongy bone and dipole of flat bones, such as sternum. In newborns, medullary cavities and all spongy bone contain red marrow. In adults, red marrow is located in the heads of femur and humerus, but most active areas of hemapoiesis are flat bone dipole and some irregular bones (such as hip bone). Yellow marrow can convert to red if person becomes anemic.
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Explain why the transport of molecules across the cell membrane is considered to be both specific and directional
What will be an ideal response?
Sharks differ from most other fishes in that
they lack
a. lungs. b. scales. c. bones. d. paired appendages. e. jaws.
Cytotoxic T cells
A. lack specificity for antigen. B. secrete granzymes and perforins that damage target cells. C. secrete interleukin-2 to stimulate B and T cells. D. are activated by free, soluble antigens.
If you want to prevent rho-dependent transcription, which sequences would you target to mutate the rho utilization (rut) site?
A) coding region B) start codon C) promoter sequence D) terminator sequence E) stop codon