Chapter 6 Biology
Chromosmes must form right at the beginning of mitosis so they can be distributed properly.
True
Cytokinesis is the final stage of cell division in both prokaryotes and eukaryotes.
True
The first phase of cell division is the G1 phase.
True
an "X" shaped chromosome is made from two identical chromatids
True
the cell cycle in prokaryotes includes DNA replication.
True
Cell division is more complicated in __________________ cells than in _____________________ cells
eukaryotic, prokaryotic
In what phase of mitosis does chromosomes form?
prophase
Which of the following is the best description of a chromosome?
the coiled from DNA assumes at the start of mitosis
Cell division in eukaryotic cells is a complex process because of
the nucleus
Most prokaryotic cells divide by the process of binary ____________________
Fission
Mitosis
ensures that each daughter cell receives a complete set of chromosmes
Human cells usually have ___ pairs of homologous chromosomes
23
The correct order of prokaryotic cell division is
DNA replication, chromosome segregation, cytokinesis
A _________ is the genetic instructions for a protein.
gene
Place the steps in order. 1) sister chromatids separate 2) chromosomes line up at the equator of the cell 3) chromosomes form 4) cytoplasm separates
3>2>1>4
How many chromosomes are in a normal human cell?
46
Why does the cell have chromosomes made of two chromatids?
After DNA has replicated it consists of two identical copies.
Which cells undergo cell division? a) bacterial cells b) blood cells c) broccoli cells d) all of the above
All of the above
Which statement about homologous chromosomes is true? A) Humans have 23 pairs of homologous chromosomes. B) Homologous chromosomes are the same size and shape. C) Homologous chromosomes contain the same genes. D) All of the above
All of the above
_________________ may result when the cell cycle loses its regulation
Cancer
What is the main difference between chromatin, chromosomes, and chromatid.
Chromatin is uncoiled DNA, when DNA coils into a chromosome it consists of two sister chromatids attached at the centromere.
The cell cycle in prokaryotes can be described as follows: the cell grows, its _______ replicates, and the cell divides.
DNA
What happens prior to prophase of mitosis?
DNA replication
Why is the cell's DNA copied prior to cell division?
Each daughter cell will have a complete set of the cell's DNA
Cell division in prokaryotes includes mitosis.
False
During cytokinesis in animal cells, a new plasma membrane and cell wall form along each side of the cell plate.
False
During telophase, the nuclear membrane reforms and the cytoplasm divides.
False
In eukaryotic cells, the nucleus and cytoplasm divide at the same time.
False
Interphase consists of the G1, S, and M phases of the cell cycle.
False
The cell cycle has 3 checkpoints: the G1, S, and G2 checkpoint.
False
Which cell cycle checkpoint makes the key decision of whether the cell should divide?
G1 Checkpoint
Interphase consists of ____, ______, and G2 phases of the cell cycle.
G1, S
Order of phases of the eukaryotic cell cycle
G1, S, G2, M
Compare and contrast cell division in prokaryotes and eukarytoes.
In prokaryotes the cell grows, DNA replicates, and the cell divides. In eukaryotes the nucleus and the cytoplasm divide.
Identify the phases of the eukaryotic cell
Interphase: G1, S, G2 M Phase: Prophase, Metaphase, Anaphase, Telophase, CYtokensis
________ is the division of the nucleus
Mitosis
What is the best description of mitosis?
Mitosis is the division of the nucleus.
The correct order of phases during mitosis is
Prophase, metaphase, anaphase, telophase
During the __________ phase of the cell cycle, the cell's DNA is copied
S (Synthesis)
What describes the role of spindile fibers best?
The spindile fibers ensure that sister chromatids will separate and go to different daughter cells when the cell divides.
What is cancer?
a disease that occurs when the cell cycle is no longer regulated
Cell division in prokaryotic cells a) is simple b) results in two daughter cells with identical chromosomes c) is called binary fission d) all of the above
all of the above
The cell cycle includes which of the following events a) growth b) cell division c) DNA synthesis d) all of the above
all of the above
In which phase of mitosis do chromatids seperate?
anaphase
The two chromatids are attached at the __________ of a chromosome
centromere
When a chromosome first forms, it actually consists of two sister _______________
chromatids
During interphase, the genetic material exists as a grainy material known as ___________
chromatin
mitosis proceeds as follows: prophase - metaphase - telophase - anaphase
false
During ______________ of mitosis, the chromosomes line up at the center of the cell.
metaphase
The M phase of the cell cycle includes ___________ and cytokinesis
mitosis
During the M phase, the ________________ and then the cytoplasm divide.
nucleus
In eukaryotic cells, the ___________ divides before the cell itself divides.
nucleus
Mitosis is the division of ------------- and cytokinesis is the division of the ---------------
nucleus, cytoplasm