Cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1839. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. It was an important step in the movement away from spontaneous generation.
The three tenets to the cell theory are as described below:
All living organisms are composed of one or more cells.
The cell is the basic unit of structure and organization in organisms.
Cells arise from pre-existing cells.
The first of these tenets is disputed, as non-cellular entities such as viruses are sometimes considered life-forms.
Microscopes
Discovery of cells
Answer:
The correct option is B. The offspring will inherit neither the genotype nor the phenotype change.
Explanation:
Any changes which occur in the DNA sequence of a person are termed as mutations.
Mutations will only be transferred to offsprings if the mutated gene or sequence gets incorporated into the genome of the mutated person.
In the above scenario, the mutation is just changing the person's phenotype and it has not been incorporated in the genotype of the affected person. Hence, the offsprings will not inherit the mutation, nether in their genotype nor the phenotype.
Parents receive vouchers amounting to the sum that the state spends on their child's education under the concept of school choice. School choice is present in the United States, where an array of alternative options are provided to parents as substitutes to the public school that are present in their district. Options received under school choice include home schooling, virtual schooling and magnet schooling.
Answer:
C, the specimen will appear fuzzy and have poor resolution
Explanation:
Immersion oil is used in a microscope to improve image quality. The oil has a high refractive index that allows light concentrate on the specimen (prevent light from away from the specimen).
