If we mix one oxygen and two atoms of hydrogen together we get water. In this reaction what is the reactant and what is the product? A. Hydrogen is reactant and energy

B. Oxygen and hydrogen are reactants and water is the product.

C. Water is the reactant and oxygen and hydrogen are the products.

D. Neither are reactants or a product.

Which of the following statements is true of cells

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.

Dna in the nucleus carries the genetic code for making proteins in ribosomes. the diagram shows a model of dna. which part of the dna molecule codes for the amino acid sequence in the protein? a) sugar b) phosphate c) deoxyribosed) nitrogen bases