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- Prophage (19:57, 30 January 2011)
- Proofreading (19:58, 30 January 2011)
- Prometaphase (19:58, 30 January 2011)
- Prokaryote (19:58, 30 January 2011)
- Progymnosperms (19:59, 30 January 2011)
- Progesterone (19:59, 30 January 2011)
- Productivity hypothesis (19:59, 30 January 2011)
- Production efficiency (20:00, 30 January 2011)
- Product rule (20:00, 30 January 2011)
- Producer (20:01, 30 January 2011)
- Procambium (20:01, 30 January 2011)
- Proboscis (20:01, 30 January 2011)
- Probability (20:01, 30 January 2011)
- Principle of species individuality (20:02, 30 January 2011)
- Principle of parsimony (20:03, 30 January 2011)
- Primordial germ cells (20:03, 30 January 2011)
- Primary vascular tissue (20:03, 30 January 2011)
- Primary tissue (20:04, 30 January 2011)
- Primary structure (20:05, 30 January 2011)
- Primary spermatocytes (20:05, 30 January 2011)
- Primary producer (20:05, 30 January 2011)
- Primary plastid (20:06, 30 January 2011)
- Primary oocytes (20:06, 30 January 2011)
- Primary metabolism (20:06, 30 January 2011)
- Primary meristem (20:07, 30 January 2011)
- Primary immune response (20:07, 30 January 2011)
- Primary endosymbiosis (20:07, 30 January 2011)
- Primary consumer (20:08, 30 January 2011)
- Primary cell wall (20:08, 30 January 2011)
- Primary active transport (20:08, 30 January 2011)
- Presynaptic cell (20:09, 30 January 2011)
- Pressure-flow hypothesis (20:09, 30 January 2011)
- Pressure potential (20:09, 30 January 2011)
- Pre-mRNA (20:10, 30 January 2011)
- Preinitiation complex (20:10, 30 January 2011)
- Pregnancy (20:11, 30 January 2011)
- Predator satiation (20:11, 30 January 2011)
- Predator (20:11, 30 January 2011)
- Predation (20:12, 30 January 2011)
- Prebiotic soup (20:12, 30 January 2011)
- Power stroke (20:12, 30 January 2011)
- Potential energy (20:12, 30 January 2011)
- Post-translational sorting (20:13, 30 January 2011)
- Post-translational covalent modification (20:14, 30 January 2011)
- Postsynaptic cell (20:15, 30 January 2011)
- Posterior (20:15, 30 January 2011)
- Postabsorptive state (20:16, 30 January 2011)
- Positive pressure filling (20:16, 30 January 2011)
- Positive feedback loop (20:17, 30 January 2011)
- Positive control (20:17, 30 January 2011)
- Positional information (20:17, 30 January 2011)
- Portal vein (20:18, 30 January 2011)
- Population genetics (20:18, 30 January 2011)
- Population ecology (20:18, 30 January 2011)
- Pons (20:19, 30 January 2011)
- Polyploid (20:20, 30 January 2011)
- Polyphyletic taxon (20:20, 30 January 2011)
- Polyphagous (20:20, 30 January 2011)
- Polypeptide (20:21, 30 January 2011)
- Polyp (20:21, 30 January 2011)
- Polymorphism (20:22, 30 January 2011)
- Polymorphic gene (20:22, 30 January 2011)
- Polymerase chain reaction (PCR) (20:22, 30 January 2011)
- Polymer (20:23, 30 January 2011)
- Polyketides (20:23, 30 January 2011)
- Polygyny (20:23, 30 January 2011)
- Polygenic (20:24, 30 January 2011)
- Polycistronic mRNA (20:24, 30 January 2011)
- Polyandry (20:25, 30 January 2011)
- Poly A tail (20:25, 30 January 2011)
- Pollinator (20:25, 30 January 2011)
- Pollination (20:26, 30 January 2011)
- Pollination syndromes (20:26, 30 January 2011)
- Pollen wall (20:26, 30 January 2011)
- Pollen tube (20:27, 30 January 2011)
- Pollen (20:27, 30 January 2011)
- Pollen grain (20:27, 30 January 2011)
- Pollen coat (20:28, 30 January 2011)
- Pole cells (20:32, 30 January 2011)
- Pole (20:32, 30 January 2011)
- Polarized (20:33, 30 January 2011)
- Polar transport (20:33, 30 January 2011)
- Polar covalent bond (20:34, 30 January 2011)
- Polar cell (20:35, 30 January 2011)
- Point mutation (20:36, 30 January 2011)
- Pluripotent (20:36, 30 January 2011)
- Pleural sac (20:37, 30 January 2011)
- Pleiotropy (20:42, 30 January 2011)
- Platelets (19:55, 1 February 2011)
- Plastid (19:55, 1 February 2011)
- Plasmolysis (19:55, 1 February 2011)
- Plasmogamy (19:56, 1 February 2011)
- Plasmodesma (plural: plasmodesmata) (19:56, 1 February 2011)
- Plasmid (19:56, 1 February 2011)
- Plasma (19:57, 1 February 2011)
- Plasma cell (19:58, 1 February 2011)
- Plaque (19:58, 1 February 2011)
- Plantae (19:59, 1 February 2011)
- Plant tissue culture (19:59, 1 February 2011)
- Plant (20:00, 1 February 2011)
- Placental transfer tissue (20:00, 1 February 2011)
- Placenta (20:01, 1 February 2011)
- Pituitary gland (20:01, 1 February 2011)
- Pituitary giant (20:01, 1 February 2011)
- Pituitary dwarfism (20:02, 1 February 2011)
- Pit (20:02, 1 February 2011)
- Pistil (20:02, 1 February 2011)
- Piloting (20:03, 1 February 2011)
- Pili (singular: pilus) (20:04, 1 February 2011)
- Phytoremediation (20:04, 1 February 2011)
- Phytoplankton (20:05, 1 February 2011)
- Phytomer (20:05, 1 February 2011)
- Phylogeny (20:06, 1 February 2011)
- Phylogenetic tree (20:07, 1 February 2011)
- Phylogenetic species concept (20:07, 1 February 2011)
- Phyllotaxy (20:07, 1 February 2011)
- Phyla (20:08, 1 February 2011)
- Phototropism (20:08, 1 February 2011)
- Phototropin (20:08, 1 February 2011)
- Photosystem II (PSII) (20:09, 1 February 2011)
- Photosystem I (PSI) (20:09, 1 February 2011)
- Photorespiration (20:10, 1 February 2011)
- Photoreceptor (20:10, 1 February 2011)
- Photoperiodism (20:11, 1 February 2011)
- Photon (20:11, 1 February 2011)
- Photoheterotroph (20:12, 1 February 2011)
- Photoautotroph: (20:12, 1 February 2011)
- Phospholipid (20:13, 1 February 2011)
- Phosphodiesterase (20:13, 1 February 2011)
- Phosphodiester linkage (20:14, 1 February 2011)
- Phoresy (20:14, 1 February 2011)
- Phloem loading (20:15, 1 February 2011)
- Phloem (20:15, 1 February 2011)
- Pheromone (20:15, 1 February 2011)
- Phenotype (20:16, 1 February 2011)
- Phenolic (20:16, 1 February 2011)
- Pharyngeal slit (20:18, 1 February 2011)
- Phagotroph (20:19, 1 February 2011)
- Phagocyte (20:20, 1 February 2011)
- Phage (20:20, 1 February 2011)
- Petiole (20:21, 1 February 2011)
- Petal (20:22, 1 February 2011)
- Peroxisome (20:22, 1 February 2011)
- Peritubular capillaries (20:23, 1 February 2011)
- Peristalsis (20:23, 1 February 2011)
- Peripheral zone (20:24, 1 February 2011)
- Peripheral nervous system (PNS) (20:25, 1 February 2011)
- Peripheral membrane protein (20:25, 1 February 2011)
- Pericycle (20:26, 1 February 2011)
- Pericarp (20:26, 1 February 2011)
- Perianth (20:26, 1 February 2011)
- Perfect flower (20:27, 1 February 2011)
- Perennial (20:27, 1 February 2011)
- Per capita growth rate (r) (20:28, 1 February 2011)
- Peptidyl transfer reaction (20:28, 1 February 2011)
- Peptidyl site (P site) (20:29, 1 February 2011)
- Peptidoglycan (20:29, 1 February 2011)
- Pepsin (20:30, 1 February 2011)
- PEP carboxylase (20:30, 1 February 2011)
- Pentadactyl limb (20:31, 1 February 2011)
- Penis (20:31, 1 February 2011)
- Pelagic zone (20:31, 1 February 2011)
- Pedipalps (20:33, 1 February 2011)
- Pedigree analysis (20:33, 1 February 2011)
- Pedicellariae (20:33, 1 February 2011)
- Pedicel (20:33, 1 February 2011)
- Pedal glands (20:34, 1 February 2011)
- Pattern formation (20:34, 1 February 2011)
- Pathogenicity (20:34, 1 February 2011)
- Pathogen (20:35, 1 February 2011)
- Paternal inheritance (20:35, 1 February 2011)
- Patch clamping (20:36, 1 February 2011)
- Passive transport (22:28, 3 February 2011)
- Passive immunity (22:44, 3 February 2011)
- Passive diffusion (22:44, 3 February 2011)
- Parturition (22:45, 3 February 2011)
- Particulate inheritance (22:45, 3 February 2011)
- Partial pressure (22:45, 3 February 2011)
- Parental type (22:46, 3 February 2011)
- Parental strand (22:46, 3 February 2011)
- Parenchyma tissue (22:46, 3 February 2011)
- Parenchyma cell (22:47, 3 February 2011)
- Parazoa (22:47, 3 February 2011)
- Parasympathetic division (22:49, 3 February 2011)
- Parasite (22:49, 3 February 2011)
- Parapodia (22:49, 3 February 2011)
- Paraphyletic taxon (22:50, 3 February 2011)
- Paracrine (22:50, 3 February 2011)
- Pangenesis (22:50, 3 February 2011)
- Pancreas (22:51, 3 February 2011)
- Palisade parenchyma (22:51, 3 February 2011)
- Paleontologist (22:51, 3 February 2011)
- Pair-rule gene (22:52, 3 February 2011)
- Paedomorphosis (22:52, 3 February 2011)
- Pacinian corpuscles (22:52, 3 February 2011)
- P protein (22:53, 3 February 2011)
- P generation (22:54, 3 February 2011)
- Oxygen-hemoglobin dissociation curve (22:55, 3 February 2011)
- Oxidative fibre (22:55, 3 February 2011)
- Oxidation (22:55, 3 February 2011)
- Ovum (22:56, 3 February 2011)
- Ovule (22:56, 3 February 2011)
- Ovulation (22:56, 3 February 2011)
- Ovoviviparity (22:56, 3 February 2011)
- Ovoviparous (22:57, 3 February 2011)
- Oviparous (22:57, 3 February 2011)
- Oviparity (22:57, 3 February 2011)
- Oviduct (22:58, 3 February 2011)
- Ovaries (22:58, 3 February 2011)
- Ovarian cycle (22:58, 3 February 2011)
- Outgroup (22:58, 3 February 2011)
- Outer segment (22:59, 3 February 2011)
- Outer ear (22:59, 3 February 2011)
- Outer bark (22:59, 3 February 2011)
- Otoliths (22:59, 3 February 2011)
- Ostracoderms (22:59, 3 February 2011)
- Ostia (23:00, 3 February 2011)
- Osteoclasts (23:00, 3 February 2011)
- Osteoblasts (23:00, 3 February 2011)
- Osmotroph (23:00, 3 February 2011)
- Osmotic pressure (23:00, 3 February 2011)
- Osmotic adjustment (23:01, 3 February 2011)
- Osmoregulator (23:01, 3 February 2011)
- Osmoconformer (23:02, 3 February 2011)
- Osculum (23:02, 3 February 2011)
- Mutagenic agents (23:25, 3 February 2011)
- Mutualism (23:26, 3 February 2011)
- Ortholog (20:26, 4 February 2011)
- Origin of replication (20:44, 4 February 2011)
- Orientation (20:46, 4 February 2011)
- Organogenesis (20:46, 4 February 2011)
- Organizing centre (20:46, 4 February 2011)
- Organismic model (20:47, 4 February 2011)
- Organismal ecology (20:47, 4 February 2011)
- Organic molecule (20:48, 4 February 2011)
- Organic farming (20:49, 4 February 2011)
- Organic chemistry (20:49, 4 February 2011)
- Organelle genome (20:50, 4 February 2011)
- Organelle (20:50, 4 February 2011)
- Organ system (20:51, 4 February 2011)
- Order (20:51, 4 February 2011)
- Orbital (20:52, 4 February 2011)
- Oral (20:52, 4 February 2011)
- Optimality theory (20:53, 4 February 2011)
- Optimal foraging theory (20:53, 4 February 2011)
- Opposable thumb (20:59, 4 February 2011)
- Opportunistic (20:59, 4 February 2011)
- Operon (20:59, 4 February 2011)
- Operculum (21:00, 4 February 2011)
- Operator (21:00, 4 February 2011)
- Operant conditioning (21:00, 4 February 2011)
- Open conformation (21:01, 4 February 2011)
- Open complex (21:01, 4 February 2011)
- Open circulatory system (21:02, 4 February 2011)
- One gene–one polypeptide theory (21:03, 4 February 2011)
- Omnivore (21:04, 4 February 2011)
- Ommatidium (21:04, 4 February 2011)
- Oligotrophic (21:04, 4 February 2011)
- Oligodendrocytes (21:05, 4 February 2011)
- Olfactory bulbs (21:05, 4 February 2011)
- Olfaction (21:06, 4 February 2011)
- Okazaki fragments (21:06, 4 February 2011)
- Ocelli (21:07, 4 February 2011)
- Obligatory mutualism (21:07, 4 February 2011)
- Obligate anaerobes (21:07, 4 February 2011)
- Obligate aerobes (21:08, 4 February 2011)
- Nucleotide excision repair (NER) (21:09, 4 February 2011)
- Nucleotide (21:09, 4 February 2011)
- Nucleoid (21:10, 4 February 2011)
- Nucleic acid (21:10, 4 February 2011)
- Nuclear pore (21:12, 4 February 2011)
- Nuclear matrix (21:12, 4 February 2011)
- Nuclear lamina (21:12, 4 February 2011)
- Nuclear genome (21:13, 4 February 2011)
- Nuclear envelope (21:13, 4 February 2011)
- Notochord (21:13, 4 February 2011)
- Norm of reaction (21:14, 4 February 2011)
- Nonvascular plant (21:14, 4 February 2011)
- Nonspecific (innate) immunity (21:15, 4 February 2011)
- Nonshivering thermogenesis (21:15, 4 February 2011)
- Nonsense codon (21:17, 4 February 2011)
- Cyclostome (09:00, 6 February 2011)
- Nonrecombinant (21:31, 6 February 2011)
- Nonrandom mating (21:31, 6 February 2011)
- Nonpolar molecule (21:32, 6 February 2011)
- Nonparental type (21:32, 6 February 2011)
- Nondisjunction (21:33, 6 February 2011)
- Non-Darwinian evolution (21:33, 6 February 2011)
- Noncyclic electron flow (21:33, 6 February 2011)
- Noncoding strand (21:34, 6 February 2011)
- Nodulin (21:34, 6 February 2011)
- Nodule (21:34, 6 February 2011)
- Nodes of Ranvier (21:34, 6 February 2011)
- Node (21:34, 6 February 2011)
- Nod factor (21:35, 6 February 2011)
- Nocturnal enuresis (21:35, 6 February 2011)
- Nociceptor (21:35, 6 February 2011)
- Nitrogenous wastes (21:35, 6 February 2011)
- Nitrogen-limitation hypothesis (21:36, 6 February 2011)
- Nitrogenase (21:36, 6 February 2011)
- Nitrification (21:36, 6 February 2011)
- Niche (21:37, 6 February 2011)
- Neutrophil (21:37, 6 February 2011)
- Neutron (21:37, 6 February 2011)
- Neutralism (21:37, 6 February 2011)
- Neutral variation (21:37, 6 February 2011)
- Neutral theory of evolution (21:37, 6 February 2011)
- Neutral mutation (21:38, 6 February 2011)
- Neurulation (21:38, 6 February 2011)
- Neurotransmitter (21:38, 6 February 2011)
- Neuron (21:39, 6 February 2011)
- Neuromuscular junction (21:39, 6 February 2011)
- Neuromodulator (21:40, 6 February 2011)
- Neurohormone (21:40, 6 February 2011)
- Neurogenic heart (21:40, 6 February 2011)
- Neural tube (21:40, 6 February 2011)
- Neural crest (21:41, 6 February 2011)
- Net reproductive rate (21:41, 6 February 2011)
- Net primary production (NPP) (21:41, 6 February 2011)
- Nervous tissue (21:42, 6 February 2011)
- Nervous system (21:42, 6 February 2011)
- Nerve net (21:42, 6 February 2011)
- Nerve impulse (21:42, 6 February 2011)
- Nerve cord (21:43, 6 February 2011)
- Nerve (21:43, 6 February 2011)
- Batesian mimicry (21:43, 6 February 2011)
- Nernst equation (18:01, 8 February 2011)
- Transformation (17:59, 9 February 2011)
- Absorptive state (00:03, 13 February 2011)
- Acclimatization (00:04, 13 February 2011)
- Acid (00:04, 13 February 2011)
- Acid hydrolase (00:05, 13 February 2011)
- Acid precipitation (00:05, 13 February 2011)
- Acidic (00:05, 13 February 2011)
- Acoelomate (00:06, 13 February 2011)
- Acquired antibiotic resistance (00:06, 13 February 2011)
- Acrocentric (00:08, 13 February 2011)
- Acromegaly (00:08, 13 February 2011)
- Acrosomal reaction (00:08, 13 February 2011)
- Acrosome (00:09, 13 February 2011)
- Actin filament (00:09, 13 February 2011)
- Action potential (00:09, 13 February 2011)
- Action spectrum (00:09, 13 February 2011)
- Bipolar Disorder (14:48, 13 February 2011)
- Altruism (19:16, 15 February 2011)
- Activator (19:17, 15 February 2011)
- Active immunity (19:19, 15 February 2011)
- Active transport (19:20, 15 February 2011)
- Adaptations (19:20, 15 February 2011)
- Adaptive radiation (19:20, 15 February 2011)
- Adenine (A) (19:21, 15 February 2011)
- Adenosine triphosphate (ATP) (19:21, 15 February 2011)
- Adenylyl cyclase (19:22, 15 February 2011)
- Adiabatic cooling (19:22, 15 February 2011)
- Adventitious root (19:23, 15 February 2011)
- Aerenchyma (19:23, 15 February 2011)
- Aerobic (19:24, 15 February 2011)
- Aerobic respiration (19:24, 15 February 2011)
- Aerotolerant anaerobe (19:24, 15 February 2011)
- Afferent arterioles (19:25, 15 February 2011)
- Aflatoxins (19:25, 15 February 2011)
- Age structure (19:26, 15 February 2011)
- Age-specific fertility rate (19:26, 15 February 2011)
- Air sac (19:26, 15 February 2011)
- Akinete (19:27, 15 February 2011)
- Algae (19:27, 15 February 2011)
- Alimentary canal (19:28, 15 February 2011)
- Alkaline (19:29, 15 February 2011)
- Allantois (19:29, 15 February 2011)
- Allele frequency (19:30, 15 February 2011)
- Allelochemical (19:31, 15 February 2011)
- Allodiploid (19:31, 15 February 2011)
- Allometric growth (19:31, 15 February 2011)
- Allopatric speciation (19:32, 15 February 2011)
- Allopatry (19:32, 15 February 2011)
- Alloploid (19:32, 15 February 2011)
- Allosteric site (19:33, 15 February 2011)
- Allotetraploid (19:33, 15 February 2011)
- Alternative splicing (19:34, 15 February 2011)
- Amensalism (19:35, 15 February 2011)
- Aminoacyl site (A site) (19:37, 15 February 2011)
- Aminoacyl tRNA (19:38, 15 February 2011)
- Aminoacyl-tRNA synthetase (19:38, 15 February 2011)
- Ammonia (NH3) (19:39, 15 February 2011)
- Ammonification (19:39, 15 February 2011)
- Amnion (19:39, 15 February 2011)
- Amniotes (19:40, 15 February 2011)
- Amoeba (19:40, 15 February 2011)
- Amoebocyte (19:41, 15 February 2011)
- Amphibian (19:41, 15 February 2011)
- Amphipathic (19:41, 15 February 2011)
- Ampulla (19:41, 15 February 2011)
- Amygdala (19:42, 15 February 2011)
- Anabolic reaction (19:43, 15 February 2011)
- Anabolism (19:43, 15 February 2011)
- Anaerobic (19:44, 15 February 2011)
- Anaerobic respiration (19:44, 15 February 2011)
- Anagenesis (19:45, 15 February 2011)
- Analogous structure (19:45, 15 February 2011)
- Anchoring junctions (19:47, 15 February 2011)
- Androecium (19:47, 15 February 2011)
- Androgens (19:48, 15 February 2011)
- Aneuploidy (19:48, 15 February 2011)
- Angiosperm (19:49, 15 February 2011)
- Animal cap assay (19:50, 15 February 2011)
- Animalia (19:51, 15 February 2011)
- Anion (19:51, 15 February 2011)
- Annual (19:52, 15 February 2011)
- Antagonist (19:52, 15 February 2011)
- Antenna complex (19:53, 15 February 2011)
- Neurons As Biological Circuits (19:55, 15 February 2011)
- Anterior (21:58, 15 February 2011)
- Anteroposterior axis (21:59, 15 February 2011)
- Anther (21:59, 15 February 2011)
- Antheridia (21:59, 15 February 2011)
- Anthropoid (22:01, 15 February 2011)
- Antibiotic (22:01, 15 February 2011)
- Antibody (22:01, 15 February 2011)
- Anticodon (22:01, 15 February 2011)
- Antidiuretic hormone (ADH) (22:02, 15 February 2011)
- Antigen (22:03, 15 February 2011)
- Antigen-presenting cells (APCs) (22:03, 15 February 2011)
- Antiparallel (22:04, 15 February 2011)
- Antiporter (22:04, 15 February 2011)
- Apical constriction (22:04, 15 February 2011)
- Apical meristems (22:05, 15 February 2011)
- Apical region (22:06, 15 February 2011)
- Apical-basal polarity (22:07, 15 February 2011)
- Apical-basal-patterning genes (22:07, 15 February 2011)
- Apomixis (22:07, 15 February 2011)
- Apoplast (22:08, 15 February 2011)
- Apoplastic transport (22:08, 15 February 2011)
- Aposematic coloration (22:09, 15 February 2011)
- Appendix (22:10, 15 February 2011)
- Aqueous humour (22:11, 15 February 2011)
- Aqueous solution (22:11, 15 February 2011)
- Aquifer (22:11, 15 February 2011)
- Arbuscular mycorrhizae (22:12, 15 February 2011)
- Archegonia (22:13, 15 February 2011)
- Archenteron (22:13, 15 February 2011)
- Area hypothesis (22:13, 15 February 2011)
- Arteriole (22:14, 15 February 2011)
- Artery (22:14, 15 February 2011)
- Artifacts (22:14, 15 February 2011)
- Artificial selection (22:15, 15 February 2011)
- Asci (22:16, 15 February 2011)
- Ascocarp (22:17, 15 February 2011)
- Ascomycetes (22:18, 15 February 2011)
- Ascospore (22:18, 15 February 2011)
- Aseptate (22:18, 15 February 2011)
- Asexual reproduction (22:19, 15 February 2011)
- Associative learning (22:21, 15 February 2011)
- Assort (22:23, 15 February 2011)
- AT/GC rule (22:23, 15 February 2011)
- Atherosclerosis (22:26, 15 February 2011)
- Atomic nucleus (22:30, 15 February 2011)
- ATP-dependent chromatin remodelling enzyme (22:34, 15 February 2011)
- ATP-driven pump (22:37, 15 February 2011)
- Atrial natriuretic peptide (ANP) (22:37, 15 February 2011)
- Atrioventricular (AV) node (22:37, 15 February 2011)
- Atrioventricular (AV) valve (22:38, 15 February 2011)
- Atrium (18:02, 16 February 2011)
- Atrophy (18:03, 16 February 2011)
- Atropine (18:04, 16 February 2011)
- Audition (18:05, 16 February 2011)
- Autoimmune disease (18:05, 16 February 2011)
- Autophagosome (18:06, 16 February 2011)
- Autophagy (18:07, 16 February 2011)
- Autosomes (18:07, 16 February 2011)
- Autotomy (18:08, 16 February 2011)
- Autotroph (18:09, 16 February 2011)
- Auxin efflux carrier (18:10, 16 February 2011)
- Auxin influx carrier (18:11, 16 February 2011)
- Auxin-response genes (18:12, 16 February 2011)
- Avirulence gene (Avr gene) (18:13, 16 February 2011)
- Axillary bud (18:14, 16 February 2011)
- Axon (18:14, 16 February 2011)
- Axoneme (18:15, 16 February 2011)
- B cell (18:16, 16 February 2011)
- Bacilli (18:16, 16 February 2011)
- Bacterial artificial chromosome (BAC) (18:17, 16 February 2011)
- Bacterial colony (18:18, 16 February 2011)
- Bacteriophage (or phage) (18:18, 16 February 2011)
- Bacteroid (18:18, 16 February 2011)
- Baculum (18:18, 16 February 2011)
- Balanced polymorphism (18:19, 16 February 2011)
- Balancing selection (18:19, 16 February 2011)
- Balloon angioplasty (18:20, 16 February 2011)
- Baroreceptor (18:20, 16 February 2011)
- Basal nuclei (18:21, 16 February 2011)
- Basal region (18:21, 16 February 2011)
- Basal transcription (18:21, 16 February 2011)
- Basal transcription apparatus (18:22, 16 February 2011)
- Base (18:22, 16 February 2011)
- Base pair (18:22, 16 February 2011)
- Base substitution (18:23, 16 February 2011)
- Basic local alignment search tool (BLAST) (18:23, 16 February 2011)
- Basidia (18:23, 16 February 2011)
- Basidiocarp (18:24, 16 February 2011)
- Basidiomycetes (18:24, 16 February 2011)