OCR A Level Biology:復(fù)習(xí)筆記2.3.3 DNA: Structure
DNA Structure The nucleic acid DNA is a?polynucleotide?– it is made up of?many nucleotides?bonded together in a?long chain A DNA nucleotide DNA molecules are made up of?two polynucleotide st...
OCR A Level Biology:復(fù)習(xí)筆記2.3.2 Phosphorylated Nucleotides
Structure of ATP & ADP All organisms require a constant supply of energy to maintain their cells and stay alive In all organisms this energy is required for: Anabolic reactions?(building larger...
OCR A Level Biology:復(fù)習(xí)筆記2.3.1 Nucleotides & Phosphodiester Bonds
Nucleotides DNA and RNA are nucleic acids:?polymers?that are made up of?many repeating units?(monomers) called?nucleotides Each nucleotide is formed from: A?pentose sugar?(a sugar with 5 carbon ato...
2022AMC12 A卷答案及分?jǐn)?shù)線預(yù)測，真題答案和視頻解析等你來領(lǐng)！
2022年AMC10/12 A卷已落幕！同學(xué)們紛紛前來反饋，對題目難度的感嘆各有不同！中國考區(qū)的實際考試時間已經(jīng)晚于MAA要求的考試時間（美東標(biāo)準(zhǔn)時間11月10日23：59），沒有靜默期限制。 大家關(guān)心的AMC12 A卷答案來了！...
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.5 Enzymes & pH: Extended
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.5 Enzymes & pH: Extended Enzymes & pH: Extended The optimum pH for most enzymes is 7 but some that are produced in acidic conditions, such as the stomach, h...
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.4 Enzymes & Temperature: Extended
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.4 Enzymes & Temperature: Extended Enzymes & Temperature: Extended Enzymes are?proteins?and have a?specific shape, held in place by?bonds This is extremely i...
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.3 Enzyme Action & Specificity: Extended
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.3 Enzyme Action & Specificity: Extended Enzyme Action & Specificity: Extended Enzymes are?specific?to one particular substrate(s) as the?active site?of the ...
2022AMC10 A卷答案及分?jǐn)?shù)線預(yù)測，真題答案和視頻解析等你來領(lǐng)！
2022年AMC10/12 A卷已落幕！同學(xué)們紛紛前來反饋，對題目難度的感嘆各有不同！中國考區(qū)的實際考試時間已經(jīng)晚于MAA要求的考試時間（美東標(biāo)準(zhǔn)時間11月10日23：59），沒有靜默期限制。 大家關(guān)心的AMC10 A卷答案來了！...
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.2 Enzyme Investigations
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.2 Enzyme Investigations Investigating the Effect of Temperature on Amylase Starch solution?is heated to a set temperature Iodine?is added to wells of a spotting til...
OCR A Level Biology:復(fù)習(xí)筆記2.2.17 Chromatography
Chromatography Chromatography is a technique that can be used to?separate a mixture?into its individual components Chromatography relies on?differences in the solubility?of the different chemicals ...
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.1 Enzymes
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.1 Enzymes What Are Enzymes? Enzymes are: Catalysts?that?speed up?the rate of a chemical reaction?without being changed?or used up in the reaction Proteins Biologica...
OCR A Level Biology:復(fù)習(xí)筆記2.2.16 Finding the Concentration of a Substance
Finding the Concentration of a Substance Benedict’s solution?can be used to carry out a?semi-quantitative?test on a reducing sugar solution to determine the concentration of reducing sugar present ...
