Chapter 6 Biology

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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


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