Select the following phylum that includes protostome animals that are segmented, bilaterally symmetric, and have a chitinous exoskeleton.  

A.  Arthropoda
B.  Annelida
C.  Mollusca
D.  Brachiopoda
E.  Platyhelminthes


A.  Arthropoda

Biology & Microbiology

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Match the following items with the correct phrases.

_______1. Found in the cell walls of both Gram-positive and Gram-negative bacteria, but greater quantities are found in the cell walls of Gram-positive bacteria. _______2. Found in the cell walls of algae, but not in the cell walls of other microorganisms. _______3. Found in the cell walls of Gram-positive bacteria, but not in the cell walls of Gram-negative bacteria. _______4. Found in the cell walls of fungi, but not in the cell walls of other microorganisms. _______5. Found in the cell walls of both Gram-positive and Gram-negative bacteria, but not found in the cell walls of archaeans. a. cellulose b. chitin c. peptidoglycan d. teichoic acids

Biology & Microbiology

Which of the following is not a female component of a flower?

a. anther b. carpel c. stigma d. style

Biology & Microbiology

Archaea reproduce primarily through ____

a. fusion b. binary fission c. sex d. meiosis e. cell joining

Biology & Microbiology

How is it possible for an enzyme to lower the required energy of activation for a reaction? What will be an ideal response?

Biology & Microbiology