All of the following cells contain mitochondria EXCEPT
A) eukaryotic cells. B) prokaryotic cells. C) plant cells. D) animal cells.
B
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According to the _____, modern humans originated in, and migrated out of, East Africa
a. haplotype data of mitochondrial DNA sequences b. haplotype data of Y chromosome sequences c. out-of-Africa model d. multiregional model e. fossil record
Cell differentiation _____
a. occurs in all complex multicelled organisms b. requires unique genes in different cells c. involves selective gene expression d. occurs in all complex multicelled organisms and involves selective gene expression e. all of these
To create a knockout mouse, after introducing to ES cells a DNA construct in which a specific gene is mutagenized by the insertion of a drug resistance marker, the cells
A) that have incorporated the transgene by homologous recombination grow in the presence of the drug and these are injected into a host blastocyst. B) that lack the transgene grow in the presence of the drug and these are injected into a host blastocyst. C) that have deleted the transgene grow in the presence of the drug and the nuclei are injected into a host blastocyst. D) that lack the transgene grow in the presence of the drug and the nuclei are used for nuclear transfer.
During metaphase I of meiosis,
A. individual chromosomes line up at the poles. B. homologous pairs are aligned at the equator. C. pairs of chromosomes separate from other pairs by spindle rays. D. only one member of each pair is in each cell.