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
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What is the waste product of photosynthesis?
a. hydrogen b. carbon dioxide c. oxygen d. water
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.
Indicator bacteria for contaminated water are ________.
A. staphylococci B. all bacteria C. coliforms D. Clostridia
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