2023AP考试报名,香港今日截止,韩国倒计时,新加坡第二轮开启!
重要消息!重要消息! 香港AP考试报名今日截止 韩国即将于11月8日截止 新加坡第二轮AP报名已开启 香港考区新增考位,今日截止报名 香港考场于10月31日新增7门科目报考名额,还没有抢到考位的同学和家长抓紧最后的...
重要消息!重要消息! 香港AP考试报名今日截止 韩国即将于11月8日截止 新加坡第二轮AP报名已开启 香港考区新增考位,今日截止报名 香港考场于10月31日新增7门科目报考名额,还没有抢到考位的同学和家长抓紧最后的...
Levels of Protein Structure There are four levels of structure in proteins Three are related to a single polypeptide chain The fourth level relates to a protein that has two or more polypeptide cha...
Amino Acid: Structure Proteins Proteins are polymers (and macromolecules) made of monomers called amino acids The sequence, type and number of the amino acids within a protein determines its shape ...
近两年在疫情和相关政策的影响下,越来越多的同学选择了英美双申或直接转向英国方向申请。 作为英国的代表高校,剑桥大学是很多同学的“梦中情校”。 可能还有些同学不太了解,其实剑桥多年来一直是接受中国学生通...
Nature of the Genetic Code The triplet code The sequence of DNA nucleotide bases found within a gene is determined by a triplet (three-letter) code Each sequence of three bases (i.e. each triplet o...
Translation Translation occurs in the cytoplasm of the cell After leaving the nucleus via a nuclear pore, the mRNA molecule attaches to a ribosome In the cytoplasm there are free molecules of tRNA ...
Transcription A gene is a sequence of nucleotide bases in a DNA molecule that codes for the production of a specific sequence of amino acids, that in turn make up a specific polypeptide (protein) T...
RNA: Structure Like DNA, the nucleic acid RNA (ribonucleic acid) is a polynucleotide – it is made up of many nucleotides linked together in a chain Like DNA, RNA nucleotides contain the nitrogenous...
DNA: Structure The nucleic acid DNA is a polynucleotide – it is made up of many nucleotides bonded together in a long chain DNA nucleotide DNA molecules are made up of two polynucleotide str...
Mononucleotides: Structure Both DNA and RNA are polymers that are made up of many repeating units called nucleotides Each nucleotide is formed from: A pentose sugar (a sugar with 5 carbon atoms) A ...
社会捐赠作为美国大学重要的资金来源之一,是学校提供高质量教学、研究和服务的基本保证! 近日,UIUC官宣他们已提前达成了“计划在5年时间内实现22.5亿美元慈善筹款”计划,仅仅用了四年,伊大就累计筹得款项27亿...
Osmosis All cells are surrounded by a cell surface membrane which is partially permeable Water can move in and out of cells across the cell surface membrane by a process called osmosis Osmosis is t...
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