Answer:
A chromosome is a DNA (deoxyribonucleic acid) molecule with part or all of the genetic material (genome) of an organism. Most eukaryotic chromosomes include packaging proteins which, aided by chaperone proteins, bind to and condense the DNA molecule to prevent it from becoming an unmanageable tangle. This three-dimensional genome structure plays a significant role in transcriptional regulation.Chromosomes are normally visible under a light microscope only when the cell is undergoing the metaphase of cell division (where all chromosomes are aligned in the center of the cell in their condensed form). Before this happens, every chromosome is copied once (S phase), and the copy is joined to the original by a centromere, resulting either in an X-shaped structure (pictured here) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. The original chromosome and the copy are now called sister chromatids. During metaphase the X-shape structure is called a metaphase chromosome. In this highly condensed form chromosomes are easiest to distinguish and study.In animal cells, chromosomes reach their highest compaction level in anaphase during chromosome segregation.
Chromosomal recombination during meiosis and subsequent sexual reproduction play a significant role in genetic diversity. If these structures are manipulated incorrectly, through processes known as chromosomal instability and translocation, the cell may undergo mitotic catastrophe. Usually, this will make the cell initiate apoptosis leading to its own death, but sometimes mutations in the cell hamper this process and thus cause progression of cancer
Answer:
1. Archaebacteria: They are single celled and thrive in extremely hot environments
2. Eubacteria: They are very commonly known to people as parasites like Streptococci, which causes strep throat. However, they can also help produce many antibiotics. They are also single celled
3. Fungi: They are multi celled organisms that are most recognizable as mushrooms, molds, mildews, and yeast.
4. Protista: They are single celled organisms that are much more complex than single celled bacteria. They are most recognizable as algae and slime molds.
5. Plantae: This kingdom is made up of flowering plants, mosses, and ferns. They are multi celled and complex.
6. Animalia: This kingdom is the largest out of all of them. It is made up of complex, multi celled organisms.
Explanation:
Answer:
The correct order is
5, 4 , 3, 2, 1
Explanation:
The first stage is the fusion of sperm with egg in fallopian tube which induces chemical reactions that prevents fusion of multiple sperm with one egg. This is known as preventing polyspermy.
After this the fused egg starts dividing and growing through the process of mitosis. The growing zygote reaches the stage of morula after few cell division and continues the division process till it reaches the stage of blastocyst.
The blastocyst now move down the fallopian tube to attach to the wall of uterus. This stage is known as implantation.
Hence, the correct order is 5, 4 , 3, 2, 1
The main events of prophase are: the condensation of chromosomes, the movement of the centrosomes, the formation of the mitotic spindle, and the beginning of nucleoli break down.
