Answer:
I think it's proteins but I'm not a 100% sure on this one
Answer:
Cell Division
Explanation:
Cells reproduce by the process of CELL DIVISION, which is the formation of an increased number of cells from a single parent cell. Mitosis is the type of cell division used for the multiplication of cells as it involves the synthesis of two identical number of daughter cells from a single parent cell.
However, certain drugs that may prevent the unregulated reproduction of cells is trying to directly affect the process of cellular division in that cell. This is because cell division is the way through which cells reproduce themselves.
Answer:
The correct option is <em>B) ultraviolet region, especially below a wavelength of 320 nm.</em>
Explanation:
Ultraviolet light carries an enormous amount of energy in it. It is invisible to the human eye. When UV light with enormous energy and wavelength lesser than 320nm, hits the DNA, it causes changes in the structure of the DNA. Mostly, it affects the thymine nitrogenous base regions and forms pyrimidine dimers. The structure of the DNA changes on all the sites where dimers form and hence, they cannot be properly transcribed.
Answer:
Atoms are electrically neutral as a result of having an equal amount of positive (due to the protons) and negative (due to the electrons) charges on it.
An ion generally is an electrically unbalanced atom (i.e an atom with a net charge on it)
A negative ion called an anion is produced when an atom gains an extra electron from a neighboring atom, giving it an extra negative charge. This can be produced by ionization with a radioactive radiation or simply by dissolution.
A positive ion is called a cation and it is produced when an atom loses electron to a neighboring atom. The loss of this electron causes the positive charges to outweigh the negative charges in the atom. Cations can be produced by radioactive radiation ionization of an atom or by simple dissolution.
The subatomic particle that is negative is the 'electron'.
Answer:
1. The DNA of every eukaryotic cell is stored in one or more CHROMOSOMES located in the NUCLEUS
2. Chromosomes contain most of the cell's DNA which acts as the molecule of heredity.
3. A duplicated chromosome remains tightly paired with its partner at a region called the CENTROMERE
.
4. Before a cell divides, it copies all of its chromosomes. While the two copies of a chromosome are attached they are called SISTER CHROMATIDS.
5. DNA and protein together form a complex called CHROMATIN.
Explanation:
Chromosomes are the structures present in the nucleus of the cells and become visible during stages of cell division. Chromosomes carry genes in linear order. Chromosomes are composed of thin threads of chromatin which in turn is made of DNA and its packing proteins. Condensation of chromatin during cell division makes the chromosomes visible.
DNA is a nucleic acid and serves to store genetic information. Stretch of DNA that codes for a specific protein is called a gene. Genes regulate the genetic traits of organisms.
DNA replication occurs during the S phase of the cell cycle. The replicated DNA is accommodated in sister chromatids of chromosomes. Before the S phase, each chromosome has one chromatid and after the S phase, each of the chromosomes has two sister chromatids that are held together at the centromere. Therefore, each of the two identical halves of a duplicated chromosome is called sister chromatid.
