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.
A) that have incorporated the transgene by homologous recombination grow in the presence of the drug and these are injected into a host blastocyst.
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B cells react with antigens through TCR antigen receptors
Indicate whether the statement is true or false.
Mendel crossed pea plants dominant for two different traits (tall and green pods) with pea plants recessive for those same two traits (short and yellow pods). This cross resulted in pea plants that had combinations of all four traits (tall with green pods, tall with yellow pods, short with green pods, and short with yellow pods). Which law of inheritance best describes why this happens?
A. the law of segregation B. the second law of thermodynamics C. the law of independent assortment D. the law of pedigrees
Brittany worked in the produce department of a grocery store in the afternoons. She wondered how much the ripeness of bananas affected the sale of the fruit. She collected data for 10 days on the total number of pounds bananas sold of green, yellow, and brown-black bananas. What is the independent variable in her experiment?
A. Ripeness of bananas B. Type of people who buy different bananas C. The number of days the data was collected D. Amount of bananas sold
Claire, a microbiologist at Yellow Stone National Park, is classifying organisms that were living in one of the natural hot pools. She notes that all of the organisms are prokaryotic cells. She knew this because the specimens lacked:
What will be an ideal response?