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- lac operon
- [Discussion] [using it to detect mutations in mice] [using it to detect cell-specific gene expression]
- lac repressor
- [Discussion] [isolating by affinity chromatography]
- Lacteal
- Lactose
- Lagging strand (DNA)
- Laminins
- Lamins
- Larva
- Immature stage of many animals that must undergo metamorphosis to become an adult. [trochophore larva] [insect larva]
- Latent period
- Lateral geniculate nucleus (LGN)
- [human] [in visual processing]
- Laurasia
- Laurasiatheria
- LD50
- [ of insecticides ]
- LDL (low-density lipoprotein)
- Leaf
- [structure] [gas exchange in]
- LEAFY protein
- Learning
- Legume
- A member of a family of pod-bearing plants that includes peas, beans, clovers, alfalfa (lucerne), and so on. [and symbiotic nitrogen fixation]
- Lens of human eye
- Lenticels
- Leptin
- Leptotene
- Leucine
- Leukemia
- A cancer characterized by an uncontrolled increase in the number of one of the leukocytes of the blood. [Chronic Myelogenous Leukemia (CML)] [Chronic Lymphocytic Leukemia (CLL)] [Acute Lymphoblastic Leukemia (ALL)] [Acute Myelogenous Leukemia (AML)]
- Leukocyte
- Leukotrienes (LTs)
- [ inhibitors for treating asthma ]
- LFA-1 (Leukocyte Function-associated Antigen-1)
- LH (Luteinizing hormone)
- Licensing factors
- Lichens
- Liddle's syndrome
- Ligaments
- Ligand
- A molecule that binds to another molecule or to a cell.
- Light-harvesting complexes (LHCs)
- Lignin
- Complex substance found in the cell walls of sclerenchyma and xylem tissue, which are strengthened by it.
- Limbic system
- Limnetic zone
- LINES (Long Interspersed Elements)
- Lineweaver-Burk plot
- Linkage
- Tendency of two genes to be inherited together because they are located on the same chromosome. [Discussion]
- Lipase
- Lipids
- [ serum lipids ]
- Lipopolysaccharide (LPS; also known as endotoxin)
- Lipoprotein
- Listeria monocytogenes
- Littoral zone
- Liver
- [hormones of] [physiology]
- Liverworts
- Lizard, heart of
- Logistic growth curve
- Long-term
- depression (LTD)
- facilitation
- potentiation (LTP)
- sensitization
- Long Terminal Repeats (LTRs)
- Loop of Henle
- Lophotrochozoans
- Lorenz, K.
- Lorenzo's Oil
- Loss of heterozygosity (LOH)
- Lovastatin
- LPS (lipopolysaccharide; also known as endotoxin)
- Luciferase
- Lumen
- The cavity inside a tubular structure such as a blood vessel or kidney tubule.
- Lung cancer
- Lungs
- [human] [other vertebrates]
- Luteinizing hormone (LH)
- Lycopsids
- Lym-1
- Lyme disease
- Lymph
- Lymph nodes
- Lymphocyte
- [ T cells and B cells ]
- Lymphoid
- Referring to lymphocytes or tissues (e.g., lymph nodes) in which lymphocytes are a major constituent.
- Lymphokine
- Protein secreted by lymphocytes that affects their own activity and/or that of other cells. Most of the interleukins are lymphokines. Lymphokines represent a subset of cytokines. [examples]
- Lymphoma
- A cancer of lymphoid tissue. [Burkitt's lymphoma]
- Lymphotoxin
- Cytokine that triggers apoptosis. Also known as tumor necrosis factor-beta (TNF-β) [More]
- Lysergic acid diethylamide (LSD)
- Lysine
- Lysis
- The disintegration of a cell following damage to its plasma membrane. [hemolysis]
- Lysogeny
- Lysosomes
- Lysozyme
- [ structure ]