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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...

biology aqa GCSE 2022 paper 2 :)what term is defined by the regulation of the internal conditions of a cell or organism to maintain optimum conditions for function in response to internal and external changes.? - ANSWERS.homeostasis give one example of a homeostatic control. - ANSWERS.blood glucose concentration/body temperature/water levels give one type of response that may be involved in an automatic control system. - ANSWERS.chemical/nervous give one thing all control systems includ...

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...

AQA Biology; Immunity UPDATED VERSION. What is an antigen? - ANSWER.Molecules, usually proteins, that are on the cell-surface membrane of pathogens that trigger an immune response What is a pathogen? - ANSWER.A disease causing microorganisms What are the 4 main stages of the immune response? - ANSWER.Phagocytosis T-Cells B-Cells Antibody production What happens during phagocytosis? - ANSWER.Chemoattractants from the pathogen attracts the phagocyte, the phagocyte moves to the pathoge...

AQA A LEVEL BIOLOGY Paper 2 2022/202What is the secondary messenger model? Demonstrated by adrenaline and glucagon as they cause glycogenolysis to occur inside cell even though they bind to receptors on the outside of the cell. Adrenaline or glucagon bind to specific complimentary receptors on the cell membrane. They activate adenylate cyclase. Convert ATP to cyclic AMP. cAMP activates protein kinase A. Protein kinase A activates a cascade to break down glycogen to glucose.3.

AQA A level Biology Revision Questions and Answers.: Prevent entry of/binding of substrate to active site; Therefore fewer/no enzyme-substrate complexes formed; Describe and explain how an increase in temperature affects the rate of an enzyme controlled reaction. [5] -ANSWER Rate of reaction increases; Increasing temperature increases rate of movement of molecules/ kinetic energy; Collide more often/substrate enters active site more often/more enzyme-substrate complexes formed; Up to optimum;...

When using an electronic cell counter, which of the following results can occur in the presence of a cold agglutination? a) increased MCV and decreased RBC b) increased MCV and normal RBC c) decreased MCV and increased MCHC d) decreased MCV and RBC - ANSWERa) increased MCV and decreased RBC Cerebrospinal fluid for glucose assay should be: a) refri

ASCP BOC EXAM Study GuideWhen using an electronic cell counter, which of the following results can occur in the presence of a cold agglutination? a) increased MCV and decreased RBC b) increased MCV and normal RBC c) decreased MCV and increased MCHC d) decreased MCV and RBC - ANSWERa) increased MCV and decreased RBC Cerebrospinal fluid for glucose assay should be: a) refrigerated b) analyzed immediately c) heated to 56 degree C d) stored at room temp after centrifugation - ANSWERb) analyzed im...

Molecular Diagnostics Chapter 11 ORIGINAL VERSION. What are examples of PCR inhibitors? - ANSWERS.hemoglobin, acidic polysacharrides, nitrate, crystals, beta-human chorionic gonadatropin, heparin, lactoferrin, anticoagulants, sodium polyanethol sulfonate, and polyamines STAR - ANSWERS.stool transport and recovery buffer inactivates infectious organisms What is the purpose of a sensitivity control? - ANSWERS.shows lower limit of detection true negative - ANSWERS.Indicates accurately tha...

Molecular Diagnostics Chapter 7(All Correct Answers Avaible)chromosome mutation - ANSWERS.change in chromosome structure Genome mutations - ANSWERS.changes in chromosome number Euploid - ANSWERS.an individual with How many base pairs are in the human genome? - ANSWERS.2.9 billion What is the difference between a mutation and a polymorphism? - ANSWERS.mutations are reserved for rare changes in DNA like those found in cancer. Polymorphisms are variants that occur in 1-2% of the population...