Which of the following is TRUE concerning
seeds?
a. Present-day ferns produce seeds.
b. Seeds contain an immature sporophyte.
c. Pollen grains mature into seeds.
d. Seeds contain a food source.
e. All of these are true
B
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A CD8+ T cell binds to an antigen only if this antigen is____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
The cephalochordates possess an atrium that is used to filter microscopic food particles out of the water.
Answer the following statement true (T) or false (F)
Which type of soil will supply nutrients to plants while its acidity leaches minerals from rock?
A. humus B. sand C. clay D. loam
Which of the following statements about cilia is false?
a. They are about 10 micrometers in length, and cells that have them usually have many of them. b. They can be used to move fluids over the cell surface or to move the cell through fluids. c. They are projections of the plasma membrane supported by microfilaments. d. Their movement relies upon the motor activity of axonemal dynein.