A cell has undergone DNA replication and the number of chromosomes has doubled. What will happen next? A.

The cell will synthesize all the proteins it needs to divide in two.

B.

Spindles will form and centrioles will move to the opposite poles.

C.

Chromosomes will line up along the middle.

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?