Mitosis & Tissues

Question 1

What is the cycle of life in a cell?

Answer 1

It will go through a series of changes from the time it is formed to until it reproduces its own cell.

Question 2

There are two phases of cell reproduction, one is Interphase, what is the second phase?

Answer 2

Mitotic Phase.

Question 3

Interphase has three subphases, the first subphase is Growth G1, what are the other two?

a. Mitosis & cytokinesis
b. Growth, DNA synthesis & Growth and final prep for division
c. Reproduction & Mitosis
d. Mitosis and growth, dna synthesis.

Answer 3

The three subphases of Interphase are:

1. Growth G1
2. Growth & DNA synthesis S
3. Growth & final prep for division G2

Question 4

What is the Mitotic phase of the life of a cell cycle?

Answer 4

In this phase cell division occurs to form 2 new identical daughter cells.
It will repair damaged tissues

Question 5

There are two subphases of the mitotic phase, they are:

Answer 5

a. Mitosis - division of the nucleus

b. Cytokinesis - division of the cytoplasm

Question 6

What are the four subphases of Mitosis?

Answer 6

Prophase
Metaphase
Anaphase
Telophase

Question 7

Why do cells need to undergo mitosis?

Answer 7

As the cells grow and become bigger, they will get to large for the cell membrane to complete transport processes and continue the supporting the cell, so it will undergo mitosis and form two identical daughter cells.

Question 8

A permanent cell is only able to undergo mitosis after a person is born, what are the other two cell types?

Answer 8

Labile - constantly undergoing mitosis

Stable - undergo mitosis only when an external factor indicates they should.

Question 9

DNA is the genetic instructions for how a body is formed and functions. What are the three units that make up DNA?

Answer 9

Nucleotides
Sides of the ladder
Rungs of the ladder.

Question 10

How many pairs of chromosomes does human cells have?

Answer 10

23 pairs - total 46.

Question 11

Prophase is the first phase of Mitosis, what happens to the chromatin in this phase?

Answer 11

Chromatin condenses to form chromosomes.

Question 12

In prophase the centrosomes move to opposite ends of the cells, what forms on them?

Answer 12

Mitotic spindle forms on them.

Question 13

Metaphse is the second phase of mitosis, the mitotic spindle now attaches to the chromosomes, what do the chromosomes do?

Answer 13

They line up along the middle of the cell, called the equator.

Question 14

Anaphase is the third phase of mitosis, where the centromeres split causing the chromatids to seperate, what are they now known as?

Answer 14

Once split the chromatids are now known as a single chromosome.

Question 15

Telophase is the fourth phase of mitosis, what is this phases also known as?

Answer 15

it is also known as the reverse of prophase.

Question 16

In telophase the chromosomes unravel to form loose chromatin, what forms around these?

Answer 16

A new nuclear membrane forms around 2 new chromatin and then the mitotic spindle breaks down.

Question 17

What is the process of cell division between gametes called?

Answer 17

Meiosis

Question 18

In fertilisation a sperm cell and an oocyte join to form a ______?

a. gamete
b. meiosis
c. zygote
d. diploid

Answer 18

It is called a zygote and they must have 23 pairs of chromosomes.

Question 19

There are 2 phases of cell division in Meiosis. What phase is different and how?

Answer 19

Meiosis 1 and 2.
Meiosis 1 has the 4 same stages as mitosis but the one difference is the double chromosomes line up in pairs on either side of the cells equator.