The DNA molecule is shaped like a ladder that is twisted into a coiled configuration called a double helix. The nitrogen bases form the rungs of the ladder and are arranged in pairs, which are connected to each other by chemical bonds.
Haematopoietic and lymphoid malignancies are tumors that affect the blood, bone marrow and lymphatic system and all of those elements are very closely connected. Because of the connection between the circulatory and immune system, if one of the elements is affected it is very possible that the other will be affected too. Type of hematological malignancy includes:
1. Leukemias-cancers of white blood cells which usually begin in the bone marrow
2. Lymphomas-blood cancers developed from the lymphocytes
<span>3. <span>Myelomas-cancer of plasma cells (which produce antibodies).</span></span>
Answer:
D
Explanation:
<u>Sister chromatids</u> will have the same form of alleles at the locus after S phase.
<em>This is because during the S phae of the cell cycle, sister chromatids are replicated in preparation for cell division. The replication process is quite accurate such that all the alleles present on the initial chromatids are also replicated on the new sister chromatids. Hence, both new and old chromatids will have the same form of alleles at the locus after replication at the S phase. In other words, sister chromatids are exact copy of one another.</em>
The correct option is D.
Answer:
HYDROGEN BONDS
Explanation:
According to this question, many solids will sink if they are placed in a liquid, however, when ice is placed in water the ice floats to the surface. This property can be attributed to the hydrogen bonds that forms between the water molecules.
Water is a substance that posseses properties that defines its uniqueness from all other substances. One of those properties is its DENSITY. The molecules of ice as a solid makes it less dense than water itself, it's liquid counterpart.
Interbreeding species concept-species concepts is not very useful in defining plant species because some plant groups readily hybridize with other plant groups. The biological species concept holds that organisms are members of a common species if they can interbreed and result in live, fertile offspring. Prezygotic and postzygotic obstacles separate species from one another and prevent mating or the development of viable, fertile offspring. New species emerge through a process called speciation. It happens when populations of a species diverge and become reproductively isolated. When groups from an ancestral population undergo allopatric speciation, it is because of a period of geographic isolation that they diverge into distinct species. When groups from the same ancestral population evolve into distinct species, there is no geographical separation.
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