2022全国青少年科技创新大赛即将开赛!附申报流程及各地区选拔时间
全国青少年科技创新大赛,是“青少年世界杯”国际科学与工程大奖赛ISEF的中国附属赛之一,它也是在三大中国附属赛中,赛制与ISEF最接近的赛事。 不仅如此,全国青少年科技创新大赛还是教育部认可的全国科创赛事活动...
全国青少年科技创新大赛,是“青少年世界杯”国际科学与工程大奖赛ISEF的中国附属赛之一,它也是在三大中国附属赛中,赛制与ISEF最接近的赛事。 不仅如此,全国青少年科技创新大赛还是教育部认可的全国科创赛事活动...
Edexcel IGCSE Maths 复习笔记 4.4.1 Speed, Density & Pressure What connects speed, density & pressure? Speed, density and pressure are all examples of variables which are calculated by divid...
Edexcel IGCSE Maths 复习笔记 4.3.1 Bearings & Scale What are bearings? Bearings (sometimes referred to as three-figure bearings) are a way of describing and using angles The way they are define...
The Triplet Code 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 (...
Genetic Loci Genes, loci and alleles The DNA contained within chromosomes is essential for cell survival Every chromosome consists of a long DNA molecule that codes for several different pro...
The Definition of a Gene A gene is a base sequence of DNA that codes for the amino acid sequence of a polypeptide or a functional RNA molecule Functional RNA molecules are required for prote...
Mitochondria & Chloroplast DNA Mitochondria A single mitochondrion is shown – the inner membrane has protein complexes vital for the later stages of aerobic respiration embedded within i...
Chromosome Structure Chromosomes are made of one very long, condensed DNA molecule associated with proteins (in eukaryotic cells) The main proteins present are the large positively charged g...
Edexcel IGCSE Maths 复习笔记 4.2.1 Angles in Polygons What is a polygon? A polygon is a flat (plane) shape with n straight sidesFor example: A triangle is a polygon with 3 sidesA quadrilateral poly...
Tracer & Ringing Experiments Tracer and ringing experiments have been used to investigate mass transport in plants It is described as a ringing experiment because it involves the removal...
Evaluating Data Linked to Mass Flow Hypothesis The mechanism of transport that occurs within the phloem is still debated by scientists The mass flow hypothesis suggests that there is a trans...
Edexcel IGCSE Maths 复习笔记 4.1.1 Angles in Parallel Lines What are parallel lines? Parallel lines are lines that are always equidistant (ie the same distance apart) – no matter how far the lines ...
© 2026. All Rights Reserved. 沪ICP备2023009024号-1