Ultracentrifugation - Study guides, Class notes & Summaries

AQA Biology WELL SOLVED. Practical TechniquesDescribe how the length of a cell could be estimated with an optical microscope - ANSWERMeasure length with an eyepiece graticle; calibrate with a stage micrometer Describe the method used to find the mean number of capillaries per mm2 in a thin section cut from sample of heart muscle - ANSWERMeasure diameter of field of view and calculate area; Using stage micrometer and eyepiece graticle; Count the number of capillaries in large number of field...

what is simple diffusion molecules pass directly through the plasma membrane without the assistance of another molecule, from a higher concentration to a lower concentration. when is simple diffusion used to allow molecules to travel in and out of the cell membrane: examples water, o2, co2 and ethanol. What is a phospholipid? It is a lipid that has a phosphate group attached to the glycerol and only two fatty acid chains. What is a protein? chain of amino acids ...

MMSC490 Practice Exam 1|123 Questions with Verified Answers cytoplasmic organelles are: a. absent in prokaryotic cells and present in eukaryotic cells. b. present in both prokaryotic and eukaryotic cells. c. present in prokaryotic cells and absent in eukaryotic cells. d. absent in both prokaryotic and eukaryotic cells. - CORRECT ANSWER a. absent in prokaryotic cells and present in eukaryotic cells E. coli is a useful model system for molecular biology studies because: a. it has a smal...

Hand-written notes on cell fractionation. Contains the conditions required and the process. Suitable for the AQA A-Level specification. Includes key terminology required to get the marks (I’ve done A-Level biology so I understand how horrible the mark schemes are). Keep going, good luck :)

Explain why plasma membranes are said to have a fluid mosaic structure. 1. Fluid because the phospholipids are constantly moving. 2. Mosaic because the proteins are scattered throughout the membrane-like tiles in a mosaic. What effect does cholesterol have on the cell membrane? 1.Cholesterol molecules fit between the phospholipids and bind to the hydrophobic tails of the phospholipids. 2.Causes them to pack together more closely, restricting the movement of other molecules in the membra...

Biology, Module 2: midterm exam question and answers complete 2024 How to calculate magnification Magnification = image size/actual size Two stages of cell fractionation Halogenation, ultracentrifugation Why is the tissue placed in a cold, buffered solution for cell fractionation? Cold to reduce enzyme activity that might break down organelles, Buffered as pH can alter structure of organelles, or function of enzymes Why is the tissue placed in a solution of the same water potenti...

This summary is hand written on aniPad contains in detail on the different types of microscopes , the process of ultracentrifugation and cell fractionation, features of eukaryotic cells/chloroplasts/prokaryotic/mitochondria.

AS BIOLOGY Paper 2 Thursday 23 May 2024 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answ...

Contains details of the different parts and organelles of a cell and their related functions. Different types of cells are listed with a list of organelles they typically contain. Eukaryotic and prokaryotic cells are both featured as well as the structure of Viral particles. Details of microscopy and cell analysis are listed and the process of ultracentrifugation is included.

An in-depth informative booklet on cells and membranes including prokaryotes, eukaryotes, akaryotes, their organelles, microscopy and more. Also includes required practicals based on this topic, useful summary questions and the specification.