Q: Q: In an atom, what two major types of particles are located in the nucleus? Read this paragraph and choose the correct option from the provided answers: Rutherford's atomic model became known as the nuclear model . In the nuclear atom, the protons and neutrons, which comprise nearly all of the mass of the atom, are located in the nucleus at the center of the atom. The electrons are distributed around the nucleus and occupy most of the volume of the atom. It is worth emphasizing just how small the nucleus is compared to the rest of the atom. If we could blow up an atom to be the size of a large professional football stadium, the nucleus would be about the size of a marble. Choices: - electrons and neutrons - molecules and neutrons - ions and electrons - protons and neutrons A:
A: protons and neutrons

Q: Q: Where are protons and neutrons located? Read this paragraph and choose the correct option from the provided answers: Protons and neutrons are located in a central nucleus, while electrons orbit about the nucleus. Choices: - outside the nucleus - secondary nucleus - orbitals - central nucleus A:
A: central nucleus

Q: Q: Plasmodesmata and gap junctions are channels between adjacent cells of what respective types? Read this paragraph and choose the correct option from the provided answers: 4.6 Connections between Cells and Cellular Activities Animal cells communicate via their extracellular matrices and are connected to each other via tight junctions, desmosomes, and gap junctions. Plant cells are connected and communicate with each other via plasmodesmata. When protein receptors on the surface of the plasma membrane of an animal cell bind to a substance in the extracellular matrix, a chain of reactions begins that changes activities taking place within the cell. Plasmodesmata are channels between adjacent plant cells, while gap junctions are channels between adjacent animal cells. However, their structures are quite different. A tight junction is a watertight seal between two adjacent cells, while a desmosome acts like a spot weld. Choices: - healthy and sick - new and old - plant and fungus - plant and animal A:
A: plant and animal

Q: Q: They had demonstrated that particles smaller than bacteria cause what? Read this paragraph and choose the correct option from the provided answers: Viruses are so small that they can be seen only with an electron microscope. Before electron microscopes were invented, scientists knew viruses must exist. How did they know? They had demonstrated that particles smaller than bacteria cause disease. Choices: - blood - flight - damage - disease A:
A: disease