Cellular organelle structure and function Nucleus The Nucleus is comprised of the pore perforated nuclear membranes‚ nucleoplasm‚ chromatin and the nucleolus at the core. The nuclear envelope consists of an inner and outer membrane that forms the outer structure. Contained within the nuclear membrane are nucloplasm which is the fluid medium in which the chromatin is present‚ chromatin being the genetic material. At the core of the nucleus is the nucleolus‚ where ribosomes are synthesized. The
Premium Cell Organelle Endoplasmic reticulum
Ecosystem Structure‚ Function‚ and Change Keyich is a city in Casdonia‚ located in Eastern Europe. Over the past six years‚ the city’s population has grown rapidly from 265‚000 in 1995 to 650‚000 in 2001‚ resulting in a 145% increase. The continious fast-paced growth estimates that by 2008 the city’s population is expeted to reach 1‚600‚000. The Keywich City Council has concerns with the excelling growth pattern and possible negative consequences associated with the growth such as cultural‚ economic
Free Waste Recycling Waste management
All organisms must have adaptations to survive. The adaptations that organisms develop help them to survive in their environments and then are passed down through reproduction. The genes are passed to future generations and adaptations continue to occur over long periods of time. Nature Works tells us‚” animals that are better adapted to their environment survive and breed. Animals that are not well adapted to an environment may not survive.” There are three types of adaptations that can occur: morphological
Premium Natural selection Evolution Biology
included) (not insisting on generic capitals) any two for 1 mark Animals‚ Protoctists‚ Prokaryotes;; (accept Latin equivalents) any two for one mark‚ all three for both that (they are) fertile; 1 (b) 2 1 (c) Total 4 __________________________________________________________________________________ klm Question 3 (a) GCE: Biology B – BYB4 June 2002 Mark across whole of two parts in (a) to credit the following possible points (structure) Distant object Close object Cornea suspensory
Premium Allele Action potential Genetics
the glomerulus. A good deal of fluid from the blood filters into the capsule. Large proteins and whole blood cells are left behind due to the fact that their too big to pass through the filters along with the plasma or blood fluid. There are four main parts of the nephron tubule: the proximal convoluted tubule‚ the U-shaped loop of Henle‚ the distal convoluted tubule‚ and the collecting duct. A substantial amount of resorption takes place in the proximal convoluted tubule. The small proteins‚ glucose
Free Kidney Nephron
The cell membrane is made up of fats‚ proteins‚ lipids‚ and carbohydrates‚ and is a permeable structure. However‚ this permeation is very discerning because it only lets certain things pass through it. The cell membrane has a layer of phospholipids with hydrophobic ends and hydrophilic tops. The “tails” are made out of phosphate‚ while the “heads” are made up of two strings of fatty acids. There are two layers of these phospholipids‚ called the “bilayer”‚ and the tips of each phospholipid are facing
Premium Cell membrane Adenosine triphosphate Lipid bilayer
Feature Structure Function Atria (singular atrium) thin walled no valves rough pectinate muscles sinus node (impulse generating tissue) interatrial septum Right atrium: Receives deoxygenated blood returning to the heart from the vena cava and pumps it to the right ventricle. Left atrium: Receives oxygenated blood returning to the heart from the pulmonary veins and pumps it to the left ventricle. Ventricles thicker walls (than atria)‚ the left is thicker than the right as blood must be pumped all
Premium Heart Blood
1.1 Introduction A forest is a complex ecosystem or assemblage of ecosystems dominated by trees and other woody vegetation. The living parts of a forest include trees‚ shrubs‚ vines‚ grasses and other herbaceous plants‚ mosses‚ algae‚ fungi‚ insects‚ mammals‚ birds‚ reptiles‚ amphibians‚ and microorganisms living on the plants and animals and in the soil and their interaction with one another and with the non-living part of the environment. The type of forest in a given area depends on many elements
Premium Mangrove Pakistan Karachi
Why is water important for living organisms? Water is very important in all living organisms‚ it is vital for many different things. Around 70% of our body weight is due to water. The quantity is high in organs such as lungs and brain and fluids such as blood‚ lymph‚ saliva and secretions by the organs of the digestive system. First of all water is vital in the regulation of body temperature to depending on the temperature mammals will alter the amount they sweat. If they are to warm the amount
Premium Plant Starch Photosynthesis
P5 – Describe the Structure and Function of the Cardiovascular System Changes in Stroke Volume Stroke volume is the amount of blood pumped out the left ventricle‚ every beat your heart makes. It can differ from your resting heart beat and your heart beat when exercising. Normally‚ when exercising‚ your heart rate increases meaning the stroke volume also increases. The blood pumped by the left ventricle is oxygenated‚ and will deliver oxygen to the muscle. The more blood injected in a heartbeat means
Premium Heart Blood Blood vessel