Molecular data confirm that cnidarians branched off from the rest of animals before ____________ evolved.  

A.  echinoderms
B.  Porifera
C.  mollusks
D.  bilaterial symmetry
E.  arthropods


D.  bilaterial symmetry

Biology & Microbiology

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The stage of viral replication in which viral nucleic acids and proteins are manufactured is

A.synthesis. B.attachment. C.release. D.assembly. E.penetration.

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Indicator bacteria for contaminated water are ________.

A. staphylococci B. all bacteria C. coliforms D. Clostridia

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Homologous recombination differs from site-specific recombination in that ________.

A. homologous recombination utilizes enzymes collectively called recombinases, whereas site-specific recombination involves RecA to bring about the crossover between DNA molecules B. homologous recombination involves long stretches of similar-sequence nucleotides on two DNA molecules that break and reanneal in a crossover mechanism, whereas site-specific recombination occurs at target sites, catalazed by recombinases C. homologous recombination takes place at specific target sites catalazed by recombinases, whereas site-specific recombination involves long stretches of same-sequence nucleotides on two DNA molecules that break and reanneal in a crossover mechanism D. homologous recombination takes place in eukaryotic cells during meiosis, whereas site-specific recombination takes place in bacteria and archaea during horizontal gene transfer

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