Asymmetry, choanocytes, filter feeding, osculum, and spicules are all terms associated with which phylum?

a. Nematoda
b. Ctenophora
c. Nemertea
d. Porifera
e. Cnidaria


ANSWER: d

Biology & Microbiology

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The variable region of a light chain is indicated by

a. A. b. B. c. C. d. D. e. E.

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What term describes the maximum population size that the environment can support indefinitely?

What will be an ideal response?

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Mutations in the nucleic acid sequence of a gene can sometimes direct the substitution of one amino acid for another in the encoded protein. Which amino acid substitution would be most likely to severely disrupt the normal structure of a protein?

A.) asparagine to threonine B.) leucine to isoleucine C.) tryptophan to phenylalanine D.) alanine to glycine E.) methionine to arginine

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Recombinant Dna technology is used by pharmaceutical companies to manufacture medications that cannot be maede by other means.

a. true b. false

Biology & Microbiology