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.

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Briefly discuss five ways to decrease one’s risk of developing cancer.. What will be an ideal response?

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Inside the cell are ___ where protein synthesis occurs.

What will be an ideal response?

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The principal microtubule-organizing center in animal cells is the ____________

(a) centrosome. (b) centromere. (c) kinetochore. (d) cell cortex.

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