Which one of the following is TRUE regarding metabolism?
A) Metabolism involves about 200 different chemical reactions occurring in a living organism.
B) An anabolic reaction is one in which a large molecule is broken down into smaller molecules.
C) Linear metabolic pathways occur when the product of one reaction is used as the substrate of the previous reaction.
D) Catabolic pathways result in the release of energy.
E) Anabolic reactions generate molecules with decreased energy content.
D
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The chemical nature of exotoxins is that of a
A. protein. B. carbohydrate. C. lipid. D. lipopolysaccharide.
B cells and dendritic cells can both ____
a. act as APCs b. produce antibodies c. differentiate into memory cells d. carry out a cell-mediated immune response e. activate helper T cells
The conducting cells in xylem are
A. sieve tube elements. B. tracheids and sieve tube elements. C. tracheids. D. tracheids and vessel elements. E. vessel elements.
Where are ocelli found?
a. in planaria only b. in arthropods only c. in planaria, some insects, some arthropods, and some molluscs d. in insects only