Most mineral ions that plants need are
a. moved into the symplast via active transport.
b. moved into the transmembrane pathway via bulk flow.
c. moved into the apoplast via facilitated diffusion.
d. moved into the symplast via facilitated diffusion.
e. moved into the apoplast via bulk flow.
A
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What stimulates the production of antibodies by B-cells?
a. B-cells bind to and recognize specific antigens and immediately start to produce antibodies. b. T-helper cells recognize specific antigens and signal B-cells. c. Antigens are recognized by macrophages as nonself, and macrophages signal B-cells. d. Antibodies are produced any time an antigen enters the body.
The ribs and sternum are considered to be part of ____
a. both the axial skeleton and the appendicular skeleton b. the axial skeleton only c. neither the axial skeleton nor the appendicular skeleton
d. the appendicular skeleton only e. the axial or appendicular skeleton depending on the animal
What type of bond forms when two elements equally share their electrons?
a. Polar b. Hydrogen c. Nonpolar d. Ionic e. None of these choices.
Enzyme activity can be controlled by
A. covalent modification. B. allosteric regulation. C. feedback (end product) inhibition. D. All of the choices are correct.