Answer:
A few of the positive particles aimed at a gold foil seemed to bounce back.
Explanation:
Rutherford gold foil experiment led to the discovery that every atom has a nucleus, its mass and all the positive charge are concentrated in it and also that most of the atom is mostly empty space.
It was performed in 1911 by Rutherford and his coworkers Ernest Marsden and Hans Geiger. They bombarded fast moving alpha particles on thin sheets of gold foil.
Most of the alpha particles passed through the sheet while few were deflected from their straight path. A small percentage of particles also bounced back from the foil. Since the alpha particles are positive so there must have been something positive inside the atoms that deflected and bounced back the alpha particles. So it led to the conclusion that the center of atom is positively charged.
<u><em>His experiments overturned Thomson's atomic model. His atomic model failed to explain the stability of atom.</em></u>
Answer:
In order to reproduce, an organism must make a copy of this material, which is passed on to its offspring. Some single-celled organisms reproduce by a process called In binary fission, material from one cell separates into two cells.
Explanation:
<span>The mirror is used to focus light through the opening in the in the stage of the microscope.</span>
Answer:
they bind to protein-coupled transmembrane receptors with higher complexity than those found in prokaryotes
Explanation:
G-proteins are proteins found inside the cells that function as molecular switches which are activated by binding to guanosine triphosphate (GTP), while they are inactive by binding to guanosine diphosphate (GDP). The G-proteins bind to G-protein-coupled transmembrane receptors (GPCRs) in the cytoplasmic region. The GPCRs are a very diverse group of proteins that are activated by extracellular molecules ranging from small peptides to large proteins, including pheromones, neurotransmitters, light-sensitive compounds, etc, thereby allowing them to respond to diverse stimuli from the extracellular environment. In consequence, it is reasonable to suppose that the signaling pathways in which G proteins are involved have a higher complexity level than those observed in primitive prokaryotic organisms.
