A researcher has a laboratory strain of flies that have loss-of-function mutations in both gene X and white. These flies are used as hosts for P element transformation: Embryos of the double mutant strain are injected with two plasmids, one containing a wild-type copy of the white gene (w+) and a wild-type copy of gene X, side-by-side within P element inverted repeats, and the other plasmid containing only the P element transposase gene. Transgenic offspring of the injected flies will Select one:
a. have both plasmids integrated randomly into the genome.
b. have white eyes and express transposase.
c. have red eyes and a wild-type copy of gene X in place of the mutant copy in their genome.
d. have red eyes and a wild-type copy of gene X integrated into a random location in the genome.

d. have red eyes and a wild-type copy of gene X integrated into a random location in the genome.

Explanation:

P elements are genetic mobile elements, i.e., transposons, which are highly mobile in the Drosophila germline. These transposons naturally cause a high rate of mutation in Drosophila germline cells resulted from an interstrain cross of males with autonomous P elements and females without P elements, a phenomenon known as hybrid dysgenesis. Moreover, a transposase in an enzyme required for the mechanism of transposition (in this case, to mediate the transposition of P elements which are reinserted randomly). The P elements have provided a useful mutagenesis system widely used in molecular biology and genetics research. In fly transformation, it is required to use plasmids with a P element (P plasmids) which contains a w+ (red-eye) marker and recognition sequences for the transposase. In this case, the embryos injected with P plasmids will contain all the components to insert the reporter gene (red-eye marker) and the wild-type copy of gene X into a random site of the genome.

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.