Answer the following question given this paragraph: Most chromosomal disorders involve the sex chromosomes. Can you guess why? The X and Y chromosomes are very different in size. The X is much larger than the Y. This difference in size creates problems. It increases the chances that the two chromosomes will fail to separate properly during meiosis. Q: Most chromosomal disorders involve which chromosomes? Choices: - autosomes - ribosomes - protosomes - sex chromosomes A:
sex chromosomes

Answer the following question given this paragraph: As the atoms approach one another, their electron clouds gradually begin to overlap. Now there are several interactions which begin to occur. One is that the single electrons that each hydrogen atom possesses begin to repel each other. This repulsive force would tend to make the potential energy of the system increase. However, the electron of each atom begins to be attracted to the nucleus of the other atom. This attractive force tends to make the potential energy of the system decrease. Q: As the atoms approach one another, their electron clouds gradually begin to do what? Choices: - magnetize - shrink - disappear - overlap A:
overlap

Answer the following question given this paragraph: In 1858, after using microscopes much better than Hooke's first microscope, Rudolf Virchow developed the hypothesis that cells only come from other cells. For example, bacteria, which are single-celled organisms, divide in half (after they grow some) to make new bacteria. In the same way, your body makes new cells by dividing the cells you already have. In all cases, cells only come from cells that have existed before. This idea led to the development of one of the most important theories in biology, the cell theory . Q: Rudolf virchow developed the hypothesis that cells only come from other cells in what year? Choices: - 1898 - 1868 - 1848 - 1858 A:
1858