Which animal phylum lacks a network of nerve cells for gathering information from the environment?
A. Porifera - sponges
B. Cnidaria - jellyfish, sea anenomes
C. Platyhelminthes -- flatworms
D. Nematoda - roundworms
E. Mollusca - octopus, squid, clams, snails, and other mollusks
A. Porifera - sponges
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What is produced during the first and second stages of aerobic respiration that are needed for the final stage (electron transfer phosphorylation)?
What will be an ideal response?
The_______ is liquid that bathes the body's cells.
A. interstitial fluid B. external water C. plasma D. bile E. urine
A culture medium consisting of agar, human blood, and beef heart is a:
A. None of the above B. Selective medium C. Complex medium D. Defined medium
Every polypeptide chain synthesized from RNA starts with which amino acid?
What will be an ideal response?