biology help please????????????

Biology
Tutor: None Selected Time limit: 1 Day

define these terms please

  • Cellular respiration
  • Glycolysis
  • Preparatory reaction 
  • Citric acid (Kreb's) cycle
  • Electron Transport chain
  • Chemiosmosis
Feb 20th, 2015

  1. Cellular respiration is the set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.

  2. glycolysis is a series of reactions that constitute the first phase of most carbohydrate catabolism, catabolism meaning the breaking down of larger molecules into smaller ones.

  3. preparatory reaction is a reaction where,pyruvate enters a mitochondrion and is oxidized to a 2 carbon acetyl group carried by CoA.

    • Citric acid (Kreb's) cycle
     process by which living cells break down organic fuel molecules in the presence of oxygen to harvest the energy they need to grow and divide.

  4. electron transport chain (ETC) is a series of compounds that transfer electrons fromelectron donors to electron acceptors via redox reactions, and couples this electron transfer with the transfer of protons (H+ ions) across a membrane.

  5. Chemiosmosis is the movement of ions across a selectively permeable membrane, down their electrochemical gradient. More specifically, it relates to the generation of ATP by the movement of hydrogen ions across a membrane during cellular respiration or photosynthesis.


Feb 20th, 2015

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Feb 20th, 2015
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