2019 - JAMB Biology Past Questions and Answers - page 6

The systemic circulation provides the functional blood supply to all body tissue. It carries oxygen and nutrients to the cells and picks up carbon dioxide and waste products. Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body.

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A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block (base pair) to a large segment of a chromosome that includes multiple genes

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DNA is found in the nucleus of cells.

The DNA is responsible for the storage of organisms' hereditary traits and helps in directing the day to day metabolic activities of each cell in the organic.

Albinism is a congenital disorder characterized in humans by the complete or partial absence of pigment in the skin, hair and eyes. Albinism is associated with a number of vision defects, such as photophobia, nystagmus, and amblyopia. Lack of skin pigmentation makes for more susceptibility to sunburn and skin cancers.

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Spermatogenesis is the process by which haploid spermatozoa develop from germ cells in the seminiferous tubules of the testis. This process starts with the mitotic division of the stem cells located close to the basement membrane of the tubules. These cells are called spermatogonial stem cells. Wikipedia

Ejaculation of sperm from a male into the vagina of a female is an example of fertilization in mammals.

Hyphae in a mushroom is a vegetative body parts made up of time and delicate thread containing nuclei

It is found in moist environment because of its adaptive features.

Euglena vivids has chloroplast  - plants feature, in order for it to carry out photosynthesis

Tuberculosis is caused by bacteria, not virus.