Essays Tagged: "Active transport"

Structure and properties of Biological membranes.

embrane. They do this by either only allowing certain shaped molecules to pass through them or they actively transport molecules wit the help of ATP. These structures give the membrane the property of ... e occurs in the nephron. The loop of henle has proteins in the membrane which pump out, by means of active transport, ions to suck out the water from the urea to retain it. This countercurrent system ...

(2 pages) 36 0 3.0 Apr/2003

Subjects: Science Essays > Biology

Descriptions of the components of a plant cell.

situation arises. The golgi is simply a membrane sack with small tentacle like appendages that uses active transport to propel itself around until it reaches its destination. The golgi is able to hold ... ells like algae, the vacuole is a contracting vacuole; this means that it fights diffusion by using active transport to force the water and salts out, this can also be used by plants to keep them rigg ...

(7 pages) 81 1 3.7 Jan/2004

Subjects: Science Essays > Microbiology

Biology Basics: Homeostasis

n area of high concentration to an area of low concentration).3. What is passive transport? What is active transport?Passive transport is the movement of substances across a membrane without the use o ... ssive transport is the movement of substances across a membrane without the use of chemical energy. Active transport is the use of energy to transport materials through the cell membrane.4. Explain hy ...

(2 pages) 63 0 4.6 Apr/2004

Subjects: Science Essays > Biology

Cell Membrane

energy is used to transport a particle from an area of lesser to greater concentration it is called active transport. Active transport also involves permease molecules. Permease involved in active tra ... lso involves permease molecules. Permease involved in active transport are known as pumps. It is by active transport that cells rid themselves of harmful particles which could poison and kill the cell ...

(5 pages) 71 1 5.0 Feb/2005

Subjects: Science Essays > Biology

Osmoregulation in Fish.

water balance, the fish drinks the sea water. The chloride secretory cells in the gills of the fish actively secrete the excess salt - gained from drinking the sea water - back out into the sea by an ... gained from drinking the sea water - back out into the sea by an energy requiring process known as active transport, against a concentration gradient. The kidneys of salt water fish only contain a fe ...

(1 pages) 22 0 5.0 Sep/2005

Subjects: Science Essays > Biology

Phloem.

llular energy *(ATP). Sucrose is loaded into the phloem vessels against a concentration gradient by active transport using ATP. This increases the solute concentration in the phloem and as a result wa ...

(1 pages) 423 1 4.0 Dec/2005

Subjects: Science Essays > Biology

Biology - The Movement of Molecules

cross it freely. The structure of the membrane allows materials to move across it by 2 main means: active and passive transport. Password transport involves two processes: Diffusion and Osmosis. Pass ... allows some substances such gases and water to move into and out of the cell without using energy. Active transport includes processes such as "ion pumps", "exocytosis" and "phagocytosis". Molecules ...

(2 pages) 30 0 5.0 Feb/2006

Subjects: Science Essays > Biology

The Activity of Sodium-Potassium Active Transport with respect to the Concentration of Cytoplasmic Sodium

reely. To help with those transportations, protein involved transports are adopted. One of which is active transport, that uses energy to move substrates against electrochemical gradient. Among many a ... ferent genes and with minor difference on amino acid sequences (Kaplan 2002). The mechanism of Na-K active transport has been widely studied, and the over all reaction can be described as by consuming ...

(3 pages) 19 0 0.0 Mar/2006

Subjects: Science Essays > Chemistry

Active and Passive Transport

Active and passive transport are the ways in which cells allow things to move into andout of the cel ... ways to transportthings. Passive transport requires no expenditure of energy by the cell. However, Activetransport requires ATPs which have energy in order for it to move something through thecell me ... carrier proteins in the cellmembrane move substances, such as glucose, into the cell without energy.Active transport is the transport of materials against a gradient that requires the useof cellular e ...

(2 pages) 35 0 3.7 Sep/2006

Subjects: Science Essays > Biology > Plant Biology

Energy Transfer between Cells

ll as creating an unwanted by-product in the process, such as ethanol or lactic acid.The process of active transport in a cell also expends energy. Endocytosis and exocytosis is the use of a transport ...

(1 pages) 541 0 0.0 Dec/2007

Subjects: Science Essays > Biology

Untitled

, it is distributed in the brain. The concentration of marijuana in the brain may be governed by an active transport process in the choroid plexus network of blood vessels in the brain which regulates ...

(8 pages) 11 0 0.0 Feb/2008

Subjects: Social Science Essays > Controversial Issues > Drugs & Alchohol

Untitled

, it is distributed in the brain. The concentration of marijuana in the brain may be governed by an active transport process in the choroid plexus network of blood vessels in the brain which regulates ...

(8 pages) 13 0 2.0 Feb/2008

Subjects: Social Science Essays > Controversial Issues > Drugs & Alchohol

Cell Organelles

cross the cell membrane to where they are in lower concentration. It supplies the plant with water7.Active transport occurs only in living cells taking up a substance against a concentration gradient8 ...

(3 pages) 13 0 1.0 Feb/2008

Subjects: Science Essays > Biology

Bio 207 notes "animal physiology"

oloride atoms and one calcium and one sodium atom into the chlorde cell from the blood is secondary active transport(the use of ATP as secondary way) it is electronuetrol cotransporterthe movement of ... can either increase HCO3-, increase O2, decrease Ca++Fresh water animal get their ion the most from active transport than getting it from food , and it also lose ion mostly from passive diffusion not ...

(4 pages) 16 0 3.0 Nov/2008

Subjects: Science Essays > Biology > Human Biology

Energy and Metabolism; Cell Structure

re pass through with ends inside and out simultaneously. The proteins that pass through are part of active transport of molecules and ions.Survival? These structures allow bacterial cells to survive w ... eans cells are used for transportation. Cells must maintain a proper balance of ions and molecules. Active transport usually happens across the cell membrane. The proteins that are inside the bilayer ...

(6 pages) 36 0 5.0 Mar/2009

Subjects: Science Essays > Biology

Animal physiology study notes

the Environment and the internal body using energyFresh water animal get their ion the mostly from active transport rather getting it from food , and it also lose its ion mostly from passive diffusio ...

(2 pages) 843 0 0.0 Mar/2009

Subjects: Science Essays > Biology

Biology Notes

embryonic development, and cells that form sperm•Transport of substances across the membraneo Active and Passive Transport are both selectively permeableoPassive Transport1.Diffusion: The random ... , causing cell to shrivele.Isotonic, Hypotonic, and Hypertonic are all examples of simple diffusionoActive Transport requires energy1.Ions or molecules will move across the membrane against the concen ...

(12 pages) 12 0 0.0 Oct/2009

Subjects: Science Essays > Biology

passive and active transport

s also no free energy required because the process of finding equilibrium is energetically favored. Active transport includes moving a solute across a membrane against its concentration gradient which ... ient which requires an input of free energy. One of the most obvious sources of this energy is ATP. Active transporters use free energy to generate a concentration gradient across a membrane.Passive a ...

(2 pages) 0 0 0.0 Nov/2014

Subjects: Science Essays > Biology