Biology Ch 5.2
Human cells normally have ______ chromosomes.
46
During anaphase, sister ________ separate and the centromeres divide
Chromatids
When a chromosome first forms, it actually consists of two sister __________
Chromatids
There may be hundreds or even thousands of genes on a single ___________
Chromosome
_________ is the division of the cytoplasm.
Cytokinesis
Chromosomes are coiled structures made of _____ and proteins.
DNA
T or F Mitosis occurs in the following order: prophase - metaphase - telophase - anaphase.
False, Anaphase happens before telophase.
T or F Chromosomes form during metaphase
False, Chromosomes form during prophase.
T or F During mitosis, DNA exists as chromatin
False, DNA exists as chromatin only during interphase.
T or F Human cells have 64 chromosomes
False, Human cells have 46 chromosomes.
T or F Mitosis is the phase of the eukaryotic cell cycle that occurs between DNA replication and the second growth phase
False, Mitosis occurs after the G2 phase.
A _______ contains genetic the instructions for making proteins.
Gene
During ________, sister chromatids line up at the equator, or center, of the cell.
Metaphase
__________ is the division of the nucleus.
Mitosis
division of the nucleus
Mitosis
The _______ fibers ensure that sister chromatids will separate when the cell divides.
Spindle
A new nuclear membrane forms during ______.
Telophase
Anaphase
phase of mitosis in which sister chromatids separate and the centromeres divide
Metaphase
phase of mitosis in which spindle fibers attach to the centromere of each pair of sister chromatids
Telophase
phase of mitosis in which the chromosomes begin to uncoil and form chromatin
The four phases of mitosis, in order, are...
prophase, metaphase, anaphase, telophase. PMAT
Prophase
the first and longest phase of mitosis
Chromatid
two copies of replicated DNA that make a chromosome
Chromatin
uncoiled DNA
T or F A chromatid is made of two identical chromosomes.
True
T or F A gene contains the instructions to make a protein
True
T or F Chromatids separate during anaphase.
True
T or F Chromosomes are coiled structures made of DNA and proteins.
True
T or F Cytokinesis is the final stage of cell division.
True
T or F Female human cells have 23 pairs of homologous chromosomes.
True
T or F Prophase is the first phase of mitosis.
True
T or F Sister chromatids are identical.
True
T or F The process in which the cell divides is called mitosis.
True
T or F There may be thousands of genes on a single chromosome.
True
Homologous Chromosome
a pair of the same chromosome
Gene
a segment of DNA with the genetic instructions to make a protein
Chromosome
coiled structures made of DNA and proteins
Cytokinesis
division of the cytoplasm
Centromere
region of the chromosome where sister chromatids are attached
