As a result of mitosis, each resulting cell
recieves and exact copy of all the chromosomes present in the parent cell.
A cell spends about 90% of the time in the first three phases: First Growth (G1), Synthesis (S) and Second Growth (G2). These collectively are known as
The process during cell division in which the nucleus of a cell is divided into two nuclei is called
During this phase of Mitosis chromotids separate at the centromeres and move to opposite poles.
During this phase of Mitosis chromosomes become visible, centrioles move to opposite sides of the nucleus, and the nuclear envelope breaks down.
The period of Interphase in which DNA replication is completed and the cell is ready to begin the process of cell division.
During this phase of Mitosis chromosomes condense and a nuclear envelope reforms around each new cluster of chromosomes.
If a cell has 12 chromosomes, how many chromosomes will each of its daughter cells have after mitosis?
T or F: The duplication of chromosomes (DNA) occurs in prophase of mitosis.
False; s phase of interphase
T or F: There are more centomeres than there are chromatids.
False; there are 2 times as many chromatids
In eukaryotic, multicellular organisms, cell division serves as _______.
growth, maintenance and repair for the cell
When a cell with 24 chromosomes divides by mitotic cell division, the resulting offspring cells will each have a maximum chromosome number of ____.
A graduate student was told to use a light microscope to count the number of chromosomes in the cells of a newly discover species. What phase of the cell cycle would the student have to investigate?
What does G1 stand for and what occurs during this phase?
Gap 1; the cell prepares for DNA synthesis and grows in size
What does G2 stand for and what occurs during this phase?
Gap 2; mitochondria and other organelles divide and more specialized cellular growth occurs
What does M phase stand for and what occurs during this stage?
Mitosis; division of the nuclei and two daughter cells are produced
What occurs during cytokinesis?
cytoplasm divides and the cell plate forms in plants and pinches in animals
How does the sequence of bases on one strand of DNA control the sequence of bases on the second strand?
adenine molecule always pairs with thymine, cytosine always with guanine
DNA helicase is an enzyme that splits the DNA molecule for replication activities. During what phase of the cell cycle would a researcher be able to investigate the activity of the enzyme?
The replication of a double-strand DNA molecule begins when the strands separate at the _____.
hydrogen bonds between paired nucleotides
A biology student was studing various cells under the microscope. She soon noticed that some cells seemed almost to pinch in half during the division. The cells that pinched in half also started to form a membrane before the end of the nuclear division. What type of cells was the student observing?
animal tissue cells
What is the relationship of microtubules to cell division in modern eukaryotic cells?
microtubules form spingle fibers
Replication of the chromosomes (DNA) is eukaryotic cells occurs during _____.
S phase of the cell cycle
During DNA replication, what is (are) the role(s) of DNA polymerases?
connects the nitrogen bases to form new hydrogen bonds and proofreads the DNA molecule, then corrects any errors found
How many chromosomes does every cell in the human body have?
40 in the stomatic cells and 23 in the sex cells
What are the parts of the error correction sequence for newly replicated DNA?
DNA ligase repairs broken DNA strands; "Proofreader" enzymes detect and remove incorrect bases; Enzymes synthesize a replacement sequence
Structures that hold chromatids together in double-stranded chromosomes are known as _____.
The synthesis of a double-stranded chromosome from a single-stranded chromosome is known as _____.
The arrangement of the chromosomes along the equator of the cell occurs during which phase of mitosis?
The disappearance of the nuclear membrane and the nucleoli occurs during which phase of mitosis?
During cytoplasmic division in plants, vesicles form a flat, membrane-bound space across the equatorial plane that is called the _____.