AP BIOLOGY

Detailed explanation-1: -Each chromosome is actually double-stranded due to duplication of genetic material during interphase that precedes mitosis. The chromosomes get shortened and thickened during prophase, so that each chromosome consists of two chromatids, joined at the centromere. Each chromatid is in fact a complete chromosome.

Detailed explanation-2: -A cell in prophase has 2x the DNA of the starting cell (as it is in G1 of the cell cycle). The forming daughter cell nuclei in the telophase cells will each have the same amount of DNA as the starting cell.

Detailed explanation-3: -Answer and Explanation: Immediately after cell division, the chromosomes will be double stranded. Chromosomes are, in effect, never single stranded. Before a cell divides, it replicates its DNA, synthesizing new strands to complement each of the original two strands in a chromosome.

Detailed explanation-4: -Double-stranded DNA is a molecule composed of two strands of DNA that twist around one another to form a double helix. The two strands are held together by hydrogen bonds that form between complementary base pairs of nucleotides (A pairs with T, and C with G) on each strand.

Detailed explanation-5: -During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes. Chromosomes are made of a single piece of DNA that is highly organized.