Glossary - Letter H

Glossary - Letter H

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H - Vitamin H or biotin. Water soluble vitamin that fights dermatitis. Main sources: leafy and green vegetables.

Habitat - environment which offers a favorable set of conditions for the development, survival and reproduction of certain organisms. The ecosystems, or part of them, in which a particular organism lives, is its habitat. Habitat constitutes the entire environment of the organism. Each species needs a particular habitat type because it has a certain ecological niche.

Haplodiplobionte - Reproductive cycle characteristic of bryophytes and pteridophytes, which alternate the sexual and asexual reproduction mode, as well as alternating the haploid and diploid generation.

Haploide - Cell containing only one genome. Symbolized by (n).

Red Cells - Red blood cell or erythrocyte; red blood cell; has hemoglobin and is responsible for the transport of gas O 2 and CO 2

Heredogram - Arrangement of chromosomal pairs distributed in descending order of size.

Heterologous - Which is different. In genetics they are chromosomes that do not resemble the shape, size or arrangement of genes. In mammals form pair XY (see X and see Y).

Heterotrophs - An organism that, not being able to produce its own food, needs to obtain it from another living being.

Heterozygous - Which come from different zygotes. Heterozygous or bivetellin twins (of different calves). (see fraternal - see hybrid).

Hyaloplasma - Liquid part of cytoplasm. Same as undifferentiated cytoplasm.

Hybrid - In individual genetics that for a certain trait presents different allele genes. Same as heterozygote.

Carbohydrate - Or carbohydrate. Name given to sugars whose molecules have the general formula C n (H 2 O) n; the name was given by the proportion of the atoms of the formula (see also monosaccharides).

Hydrolysis - Type of chemical reaction in which bonds break down with the participation of water molecules.

Hyphae - Filament constituting multicellular fungi (see also Mycelium).

Hypertonic - It is said of the solution whose concentration in solutes is relatively higher than that of another (hypotonic).

Hypotonic - Having sufficiently low solute concentration to lose water to another solution through a selectively permeable membrane.

Holoenzyme - Complex formed by an enzyme and its cofactor (enzyme activating substance).

Counterpart - That is the same. Homologous chromosomes. They are pairs formed by chromosomes that have the same size, the same shape and the same gene sequence.

Homeostasis - adaptability that a living being has in order to keep his body balanced against environmental variations.
Homeotherms - or endotherms, are animals that constantly maintain their body temperature, regardless of the external temperature, expending a large amount of energy in carrying out their control.

Homozygote - From the same zygote (see zygote). Homozygous twins are those that came from the same egg (or zygote) cell. That is why they have the same gene load and the same sex. They are also called univitelines.

Hormogony - Species of reproduction occurring in filamentous multicellular beings. It consists of disruption of the cell chain. Each piece of filament regenerates into a new being.

Hormone - Substance secreted directly by cells of glands or endocrine organs (in animals); Plant hormones are called phytohormones; Hormones act in small amounts on specific tissues or organs (hormone targets).