9. The table shows the time taken for mammalian cells to divide by mitosis at different temperatures.Table 9Temperature (C)310152025Time taken for cell division in hours146432(a) Plot the data on the grid provided.[3](b) Describe the effect of temperature on cell division.[1](c) Starting...
(b)Meiosis is another type of nuclear division.Describe how the nuclei in cells produced by meiosis differ from the nuclei in cells produced by mitosis.-[3](c) Stem cells divide by mitosis during the growth of an embryo.Describe the role of stem cells in the growth of an embryo.-[2]...
Remember that when cells divide, each new cell needs an exact copy of the DNA in the parent cell. This is why mitosis is only visible in cells that are dividing, like the whitefish embryo and the onion root tip. Mitosis can take several hours to complete. Scientists will make slides of...
Most cells in the human body can divide via a processes called mitosis. Mitosis occurs when a cell divides and creates two genetically identical copies of itself. Specialized sex cells can divide by meiosis, which occurs when a sex cell creates four daughter cells that are all genetically ...
Question: What are cells and mitosis? 田:人体的所有器官或特殊结构都由叫做细胞的基本单位构成,成年人体内包括约372,000亿个细胞,其中可分为体细胞和干细胞两类,体细胞由干细胞分化而来。每个细胞都有各自独立的部分功能,比如合成蛋白质、自我复制分...
The Cell Cycle. Cells divide during mitosis and cytokinesis. Cells that make up the “body” of an organism 2. Stages of the Cell Cycle Activity #44 PHASES OF THE CELL CYCLE The Cell Cycle & Cell Division (Eukaryotic cells). 4 Phases of the Cell Cycle : ...
Further experiments revealed that as cells enter mitosis, they ramp up activity of a process called lysosomal exocytosis. Lysosomes are cell organelles that break down or recycle cellular waste products, and exocytosis is the process they use to jettison any molecules that aren’t needed anymor...
Somatic cells are found all throughout the body, except in cells that are responsible for producing sex cells. All somatic cells divide by mitosis to maintain their chromosome number; hence, they never divide by meiosis. Only germline cells undergo meiotic cell division. The word 'somatic' origi...
Anaphase II The DNA molecules held together by the centromere separate and move to opposite ends of the cell Telophase II and Cytokinesis Nuclear membranes form around each set of DNA molecules and split into four daughter cells that contain half the number of chromosomes as the parent cell...
A theory of the origin of eukaryotic cells ("higher" cells which divide by classical mitosis) is presented. By hypothesis, three fundamental organelles the mitochondria, the photosynthetic plastids and the (9+2) basal bodies of flagella were themselves once free-living (prokaryotic) cells. The ev...