Supported by. Pat Tillman walked away from a lucrative career in the National Football League to join the military and fight in Afghanistan, where he was ultimately killed by friendly fire in an incident that was initially covered up.
A membrane-enclosed sac that is part of the endomembrane system of a eukaryotic cell, having diverse functions. central vacuole. A membrane-enclosed sac occupying most of the interior of a mature plant cell, having diverse roles in reproduction, growth, and development. peroxisome. sac made of membrane in the cytoplasm of a eukaryotic cell. endoplasmic reticulum (ER). An extensive membranous network in a eukaryotic cell, continuous with the outer nuclear membrane and composed of ribosome-studded (rough) and ribosome-free (smooth) regions.
Summary. The plant body is composed of cells and their products. All plant cells are surrounded by a rigid cell wall that is produced by the cell. Inside the wall is the cell membrane, which selectively regulates the movement of materials into and out of the cells.Plant cells are compartmentalized into organelles that are structurally organized to support their function.The nucleus, chloroplast, ribosomes, and vacuole are examples of plant cell organelles.nside the wall is the cell membrane, which selectively regulates the movement of materials into and out of the cells. Plant cells are compartmentalized into organelles that are structurally organized to support their function. The nucleus, chloroplast, ribosomes, and vacuole are examples of plant cell organelles.