Which cell organelles are made of microtubules, are always found in pairs, and are important in forming the spindle apparatus and cleavage furrow during the division in animal
cells?

The activity of the modern sample is 1.10 bq . how long does that measurement take?

What is the difference between a meteoroid and a meteor?

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.