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Campbell Biology 9th Edition Reece Find Best Prices On: CampBell 9th Edition → Published: Oct 7, 2010 → Reece - Urri - Cain - Wasserman Free Trial Sample - Test Before you Buy Questions or Concerns? Order Entire eBook - Best Value Try this with your TextBook: Order just 1 or more units Buy the book in sections if you don't need the entire text right now Unit 1: Chapters 1 →5 Unit 2: Chapters 6 →12 Unit 3: Chapters 13 →21 Unit 4: Chapters 22 →25 Unit 5: Chapters 26 →34 Unit 6: Chapters 35 →39 Unit 7: Chapters 40 →51 Unit 8: Chapters 52 →56 Choose Your Free Gift Sample Slides Glossary Reece CampBell 9ex 5' cap A modified form of guanine nucleotide added onto the 5' end of a pre-mRNA molecule. A site One of the ribosome's three binding sites for tRNA during translation. The A site holds the tRNA carrying the next amino acid to be added to the polypeptide chain. ABC hypothesis A model of flower formation identifying three classes of organ identity genes that direct formation of the four types of floral organs.

Abiotic Nonliving; referring to the physical and chemical properties of an environment. Abortion The termination of a pregnancy in progress. Abscisic acid (ABA) A plant hormone that slows growth, often antagonizing the actions of growth hormones. Two of its many effects are to promote seed dormancy and facilitate drought tolerance absorption The third stage of food processing in animals: the uptake of small nutrient molecules by an organism's body. Absorption spectrum The range of a pigment's ability to absorb various wavelengths of light; also a graph os such a range. Abyssal zone The part of the ocean's benthic zone between 2000m and 6000m deep. Acanthodian Any of a group of ancient jawed aquatic vertebrates from the Silurian and Devonian periods.

Accessory fruit A fruit, or assemblage of fruits, in which the fleshy parts are derived largely or entirely from tissues other than the ovary. Acclimitization Physiological adjustment to a change in an environmental factor. Acetyl CoA Acetyl coenzme A; the entry compound for the citric acid cycle in cellular respiration, formed from a fragment of pyruvate attached to a coenzyume. Pcm600 Software Free Download.

Acetylcholine One of the most common neurotransmitters; functions by binding to receptors and altering the permeability of the postsynaptic membrane to specific ions, either depolarizing or hyperpolarizing the membrane. Acid A substance that increases the hydrogen ion concentration of a solution. Acid precipitation Rain, snow, or fog that is more acidic than pH 5.2. Acoelomate A solid bodied animal lacking a cavity between the gut and outer body wall. Acrosomal reaction The discharge of hydrolytic enzymes from the acrosome, a vesicle in the tip of a sperm, when the sperm approaches or contacts an egg. Actin A globular protein that links into chains, two of which twist helically about each other, forming microfilaments (actin filaments) in muscle and other kinds of cells. Action potential An electrical signal that propagates (travels) along the membrane of a neuron or other excitable cell as a nongraded (all-or-none) depolarization.