What do carbohydrates, lipids, and proteins have in common?
A) All are important enzymes that function within the cell.
B) All are inorganic molecules.
C) Covalent bonding holds these molecules together.
D) Polymers of these organic molecules form monomers via dehydration synthesis reactions.
C
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Four of the five vitamins listed below are members
of the B-complex vitamins. Select the exception. a. ascorbic acid b. folic acid c. pantothenic acid d. riboflavin e. thiamine
Which of the following features would tend to
promote water reabsorption by the vertebrate kidney? a. many nephridia b. a long loop of Henle c. a short collecting duct d. a short distal tubule e. a high filtration rate
The left and right sides of the cerebrum are interconnected by which one of the following?
A) pons B) medulla oblongata C) corpus callosum D) thalamus E) cerebral cortex
What is the name of the mesoderm-derived, calcium-stiffened structures that comprise the internal skeleton of echinoderms?
a. ampullae b. ossicles c. madreporites d. radial canals