On the basis of the arrangement and the number of flagella, the following types of bacteria are classified - Type of bacteria Description of... View Article
Based on the forms, bacteria are designated as coccus, bacillus, spirillum and vibrio forms. Cocci form, in turn, depending on the mode of their... View Article
Bacteriophages exhibit two types of life cycles namely the Lytic life cycle and lysogenic life cycle. The viruses that kill the host bacterium... View Article
The non-living properties of viruses are - Viruses lack cellular organization as they do not contain protoplasm and the enzyme system of their... View Article
The living properties of viruses are - All viruses are nucleoproteinaceous in nature Nucleic acid found is either RNA or DNA, never both in... View Article
Apoptosis is a necessary evil among multicellular organisms like a man. Organisms have many advantages due to the process as given below -... View Article
Apoptosis is a programmed cell death involving systematic disassembly of cells. The following are the important features of an apoptotic cell -... View Article
Genetic analysis of family histories of cancer patients shows that most of the common cancers have no genetic pattern. But there are cases of... View Article
One of the biggest problems of cancer is its capacity to spread in the body. It spreads by one or all the following 3 methods - Lymphatic... View Article
Anaphase I begins with the shortening of chromosomal fibres that are attached to the centromeres of homologous chromosomes. Hence, each... View Article
Chromosomes in diakinesis will have undergone maximum condensation and appear thicker and shorter than at any other stage. As the homologous... View Article
After the completion of crossing over and recombinations, synapse chromosomes begin to repel from one another during diplotene. However, the... View Article
During pachytene, a mutual exchange of chromosomal material between non-sister chromatids of the bivalents occurs. This genetic exchange is... View Article
The pairing of homologous chromosomes is completed during the pachytene stage. As a result of continued condensation, chromosomes become much... View Article
Zygotene is a stage of chromosome pairing. The homologous chromosomes (maternal and paternal chromosomes) come closer and start pairing together... View Article
The importance of meiosis goes beyond maintaining chromosome number from one generation to the next. Meiosis also builds genetic variability in a... View Article
If gametes contained the same number of chromosomes as other body cells, the chromosome number would double with each generation. For humans,... View Article
Reproduction is one of the basic traits of life. Most multicellular organisms reproduce sexually. This involves the production of gametes wherein... View Article
