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Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced so that at fertilization a diploid zygote forms. This tutorial is an in-depth study guide regarding male and female reproductive physiology...
The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is described in this tutorial. Failure to regulate blood sugar levels could lead to physiological disorders and diseases, such as diabetes. Read this tutorial to learn more...
Genes are expressed through the process of protein synthesis. This elaborate tutorial provides an in-depth review of the different steps of the biological production of protein starting from the gene up to the process of secretion. Also included are topics on DNA replication during interphase of the cell cycle, DNA mutation and repair mechanisms, gene pool, modification, and diseases...
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, sea land, and water in a cycle. This tutorial explains in brief what occurs in the water cycle. Also, it delineates what is groundwater and surface run-off. This is an essential background as to how the water moves in an ecosystem both geologically and biologically...
Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting compounds, such as lignin, ethylene, galls, and tannins. Find out how these mechanisms protect the plants from pathogens...