He structure labeled __________ in Figure 35-1 is formed in the leaf scars by vascular tissue that extends from the stem out into the leaf
T
a. 5
b. 6
c. 7
d. 8
e. 9
E
Biology & Microbiology
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A CD4+ T cell binds to an antigen only if this antigen
a. is in a complex with a class I MHC protein. b. is in a complex with a class II MHC protein. c. is in a complex with a class III MHC protein. d. is NOT in a complex with MHC proteins. e. is presented on the surface of a B cell.
Biology & Microbiology
Briefly discuss five ways to decrease one’s risk of developing cancer.. What will be an ideal response?
Biology & Microbiology
Inside the cell are ___ where protein synthesis occurs.
What will be an ideal response?
Biology & Microbiology
The principal microtubule-organizing center in animal cells is the ____________
(a) centrosome. (b) centromere. (c) kinetochore. (d) cell cortex.
Biology & Microbiology