教授在讲解端粒时通常会指出,端粒是染色体末端的保护结构,其DNA由重复的非编码序列组成。这些序列不包含基因或遗传信息,因此被称为“遗传无意义”(genetically meaningless)。 - **选项A**错误,因为端粒不直接触发细胞分裂,而是与细胞分裂次数限制相关。 - **选项B**错误,端粒位于染色体末端,并非用于分隔基因。 - ...
Learn about the purpose of the nucleus in a cell and see why the nucleus is important. Study the functions and roles of the nucleus and understand the DNA process. Related to this QuestionWhat does a nucleus do in a plant cell? What does a nucleus look like in a plant cell? What is ...
What impact does the type and quality of DNA or RNA have on transfection success? Genetic material with higher purity will routinely deliver better transfection outcomes. Identifying contamination by lipopolysaccharides (endotoxins) that are introduced by bacteria during the manufacturing process is critical...
However, the other nucleic acid, RNA, is showing itself to be an equally interesting and challenging molecule to study. Its role in the cell isn’t as straightforward as it is for DNA, giving scientists some exciting avenues of investigation. So, what exactly does this molecule do in the c...
Packaging of DNA into the cell nucleus (Photo Credit : Designua/Shutterstock) What Does DNA Do? DNA is like a set of instructions that govern the arrangement of amino acids. It is composed of various 3 letter codes, calledcodons. These codons need to be interpreted in order to attain the...
DNA :One of the characteristics of life is the presence of DNA. If DNA is not present in a cell then the organism is not considered living. DNA is very important for the functioning of the cell.Answer and Explanation: DNA stands for deoxyribonucleic acid. It is a kind of nucleic acid ...
Cells can vary between 1 micrometer (μm) and hundreds of micrometers in diameter. Within a cell, a DNA double helix is approximately 10 nanometers (nm) wide, whereas the cellular organelle called a nucleus that encloses this DNA can be approximately 1000 times bigger (about 10 μm). Se...
Dark DNA is the genetic code in the human genome that currently has no known original source. We have traced 8% of the human genome to viruses. 1-2% of our genome comes from other animals. Believe it or not you share 55% of your genetic code with a banana – and that’s not just...
Many question, “What does the Cell cycle have to do with cancer?”The cell cycle is a process in which cells develop and go on to divide.The cell cycle lies in the metaphorical heart of cancer. The cell cycle is a series of pathways by which a cell is signaled and continues to grow...
Now, a telomere is a highly repetitious…and genetically meaningless sequence of DNA, what we were calling “junk DNA.”But it does have an important purpose. It's sort of like the plastic tip on each end of a shoelace.It may not help you tie your shoe, but that little plastic tip ...