Gcse Biology B2 Ocr

Hydrogen Ion (H+) – Occasionally a hydrogen atom participating in a hydrogen bond between two water molecules shifts from one molecule to the other. When this happens, the hydrogen atom leaves its electron behind, and what is actually transferred is a hydrogen ion. (H+) is now a single proton with a charge of 1+
Pyramid of numbers – an illustration of the number of organisms feeding at each trophic level
Rhizoids – the thin hair-like structure that anchors bryophytes and acts like a root through which nutrients are absorbed
secondary structure – Regions of repetitive coiling or folding of the polypeptide backbone of a protein due to hydrogen bonding between constituents of the backbone (not the side chains).
purebred – type of organism whose ancestors are genetically uniform.
Prophase – First and longest phase of mitosis in which the nuclear envelope disappears and chromosomes become visible
Alpha-feto protein (AFP) is:
organization – the high degree of order within an organism's internal and external parts and in its interactions with the living world
homologous chromosomes – Chromosomes that are similar in size, shape, and genetic content
muscle tissue – Tissue made of cells capable of contracting.
endoplasmic reticulum – an internal membrane system in which components of cell membrane and some proteins are constructed
macrophages – Amoeboid cells that roam connective tissue and engulf foreign particles and debris of dead cells.
What is a food chain? – It shows the feeding relationships between particular organisms, and the dependence some have on others (predators need the prey, so they can have food and survive).
Alphа-fetо prоtein (AFP) is:
alcohol fermentation – Glycolysis followed by the reduction of pyruvate to ethyl alcohol, regenerating NAD+ and releasing carbon dioxide.

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