How many daughter cells are produced in meiosis? How many chromosomes are visible at the beginning of mitosis? How many sister chromatids are found in a human somatic cell nucleus during mitosis? How many daughter cells are produced from each parent cell during meiosis?
There are two kinds of cell division that take place in an organism. Mitosis and meiosis. Mitosis produces an identical cell; it maintains the chromosome number. Meiosis produces four gametes that are haploid. Cell Structure and Biology:Cells contain a nucleus. The nucleus contains the cell's ...
coli bacterium, cells of plants and animals have chromosomes that hold the DNA strands. Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. Fruit flies have five pairs. Dogs have 39 pairs, and some plants have as many as 100. Chromosomes come in pairs. Each chromosome is...
Topoisomerase activity is indispensible to cells, but requires the transient breakage of DNA strands. This property has been exploited, often for significant clinical benefit, by various exogenous agents that interfere with cell proliferation. Despite decades of study, surprising findings involving ...
Complex organisms, like plants and animals, have 50,000 to 100,000 genes on many different chromosomes (most humans have 46 chromosomes). In the cells of these organisms, the DNA is twisted around bead-like proteins called histones. The histones are also coiled tightly to form chromosomes, wh...
Mitosis is important to multicellular organisms becauseit provides new cells for growth and for replacement of worn-out cells, such as skin cells. Many single-celled organisms rely on mitosis as their primary means of asexual reproduction.
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DNA repair can occur at several stages of the cell cycle but cells are mostly arrested in the G1/S and G2/M phases. If damage occurs due to replication errors, an arrest can also occur in the S-phase or later in mitosis. FIGURE 2. DNA repair mechanisms at the molecular level. I....
With the intensification of the greenhouse effect, a series of natural phenomena, such as global warming, are gradually recognized; when the ambient temperature increases to the extent that it causes heat stress in plants, agricultural production will in
How many chromosomes do monkeys have? How many chromosomes does the family Ursidae have? How many chromosomes are found inside the nucleus of every human cell except egg and sperm cells? In humans, how many chromosomes are in each cell after mitosis?