abiogenesis - body's internal environment enabling them to...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
abiogenesis Early theory that held that some organisms originated from nonliving material. abnormal hemoglobin Hemoglobin molecule with a different shape due to an altered amino acid sequence (ultimately caused by an altered DNA base sequence), such as in the inherited disease sickle-cell anemia . abscisic acid A plant hormone that promotes dormancy in perennial plants and causes rapid closure of leaf stomata when a leaf begins to wilt. absolute time One of the two types of geologic time ( relative time being the other), with a definite age date established mostly by the decay of radioactive elements, although ages may also be obtained by counting tree rings, decay of a specific type of atom, or annual sedimentary layers (such as varves in lakes or layers in a glacier). The term is in some disfavor because it suggests an exactness that may not be possible to obtain. absorption The process by which the products of digestion are transferred into the
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: body's internal environment, enabling them to reach the cells. absorptive feeders Animals such as tapeworms that ingest food through the body wall. acetylcholine A chemical released at neuromuscular junctions that binds to receptors on the surface of the plasma membrane of muscle cells, causing an electrical impulse to be transmitted. The impulse ultimately leads to muscle contraction. acetyl CoA An intermediate compound formed during the breakdown of glucose by adding a two-carbon fragment to a carrier molecule (Coenzyme A or CoA). acid A substance that increases the number of hydrogen ions in a solution. acid rain The precipitation of sulfuric acid and other acids as rain. The acids form when sulfur dioxide and nitrogen oxides released during the combustion of fossil fuels combine with water and oxygen in the atmosphere. acoelomates Animals that do not have a coelom or body cavity; e.g., sponges and flatworms....
View Full Document

This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

Ask a homework question - tutors are online