Abjad L

JEJAK MAHASISWA	..:: KAMUS BIOLOGI JEJAK MAHASISWA ::..															Dibuat 12/19/2011
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Glosarium ini diambil dari Buku Biologi Campbell | Jejak Mahasiswa

lacteal 

(lak-TEEL) A tiny lymph vessel extending into the core of an intestinal villus and serving as the destination for absorbed chylomicrons.

lagging strand 

A discontinuously synthesized DNA strand that elongates in a direction away from the replication fork.

larva 

(LAR-vuh) (plural, larvae) A free-living, sexually immature form in some animal life cycles that may differ from the adult in morphology, nutrition, and habitat.

lateral line system 

A mechanoreceptor system consisting of a series of pores and receptor units (neuromasts) along the sides of the body of fishes and aquatic amphibians; detects water movements made by an animal itself and by other moving objects.

lateral meristem 

(MARE-eh-stem) The vascular and cork cambium, a cylinder of dividing cells that runs most of the length of stems and roots and is responsible for secondary growth.

law of independent assortment 

Mendel's second law, stating that each allele pair segregates independently during gamete formation; applies when genes for two traits are located on different pairs of homologous chromosomes.

law of segregation 

Mendel's first law, stating that allele pairs separate during gamete formation, and then randomly re-form pairs during the fusion of gametes at fertilization.

leading strand 

The new continuous complementary DNA strand synthesized along the template strand in the mandatory 5' to 3' direction.

leaf 

The main site of photosynthesis in a plant; consists of a flattened blade and a stalk (petiole) that joins the leaf to the stem.

leukocyte 

(LOO-koh-site) A white blood cell; typically functions in immunity, such as phagocytosis or antibody production.

LH

See luteinizing hormone.

lichen 

(LY-ken) An organism formed by the symbiotic association between a fungus and a photosynthetic alga.

life cycle 

The entire sequence of stages in the life of an organisms, from the adults of one generation to the adults of the next.

life table 

A table of data summarizing mortality in a population.

ligament 

A type of fibrous connective tissue that joins bones together at joints.

ligand 

(LIG-und) A molecule that binds specifically to a receptor site of another molecule.

light microscope 

(LM) An optical instrument with lenses that refract (bend) visible light to magnify images of specimens.

light reactions 

The steps in photosynthesis that occur on the thylakoid membranes of the chloroplast and convert solar energy to the chemical energy of ATP and NADPH, evolving oxygen in the process.

lignin 

(LIG-nin) A hard material embedded in the cellulose matrix of vascular plant cell walls that functions as an important adaptation for support in terrestrial species.

limbic system 

(LIM-bik) A group of nuclei (clusters of nerve cell bodies) in the lower part of the mammalian forebrain that interact with the cerebral cortex in determining emotions; includes the hippocampus and the amygdala.

linked genes 

Genes that are located on the same chromosome.

lipid 

(LIH-pid) One of a family of compounds, including fats, phospholipids, and steroids, that are insoluble in water.

lipoprotein 

A protein bonded to a lipid; includes the low-density lipoproteins (LDLs) and high-density lipoproteins (HDLs) that transport fats and cholesterol in blood.

locus 

(LOH-kus) (plural, loci) A particular place along the length of a certain chromosome where a given gene is located.

logistic population growth

A model describing population growth that levels off as population size approaches carrying capacity.

long-day plant 

A plant that flowers, usually in late spring or early summer, only when the light period is longer than a critical length.

loop of Henle 

The long hairpin turn, with a descending and ascending limb, of the renal tubule in the vertebrate kidney; functions in water and salt reabsorption.

lungs 

The invaginated respiratory surfaces of terrestrial vertebrates, land snails, and spiders that connect to the atmosphere by narrow tubes.

luteinizing hormone (LH) 

(LOO-tee-in-EYE-zing) A protein hormone secreted by the anterior pituitary that stimulates ovulation in females and androgen production in males.

lymph 

(limf) The colorless fluid, derived from interstitial fluid, in the lymphatic system of vertebrate animals.

lymphatic system 

(lim-FAT-ik) A system of vessels and lymph nodes, separate from the circulatory system, that returns fluid and protein to the blood.

lymphocyte 

A white blood cell. The lymphocytes that complete their development in the bone marrow are called B cells, and those that mature in the thymus are called T cells.

lysogenic cycle 

A type of phage replication cycle in which the viral genome becomes incorporated into the bacterial host chromosome as a prophage.

lysosome 

(LY-so-some) A membrane-enclosed bag of hydrolytic enzymes found in the cytoplasm of eukaryotic cells.

lysozyme 

(LY-so-zime) An enzyme in perspiration, tears, and saliva that attacks bacterial cell walls.

lytic cycle 

(LIT-ik) A type of viral replication cycle resulting in the release of new phages by death or lysis of the host cell.