When does recombination occur?
A) before DNA replication
B) at the two-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and before DNA replication
C) at the four-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and before DNA replication
D) at the two-strand stage, when the sister chromatids have been separated, and after DNA replication
E) at the four-strand stage, when each member of a homologous chromosome pair is composed of two sister chromatids, and after DNA replication
E
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Production of a neurotoxin that binds to target sites on spinal cord neurons responsible for inhibiting skeletal muscle contraction is a characteristic of ________.
A. Clostridium tetani B. Clostridium difficile C. Clostridium perfringens D. Clostridium botulinum
The application called multiple strand displacement amplification is a powerful tool because
A. it provides errorless sequencing results for that microorganism. B. it provides data on the pathogenic nature of the microorganism. C. it identifies the transcriptome of the microorganism. D. it allows single-cell genomic sequencing that can analyze uncultivated microorganisms.
Which number identifies the structure that carries out protein synthesis?
a. 2 b. 4 c. 5 d. 6 e. 9
Ecologists determined that, regardless of the richness
of the ecosystem, energy passes through no more than __________ trophic levels. a. one or two b. two or three c. three or four d. four or five e. five or six