Cell Division

Question 1

New Cells are Needed for an Organism to _______.

Answer 1

Grow.

Question 2

New Cells are Needed to __________ Cells that Become Worn Out and to Repair Damaged ___________.

Answer 2

Replace…Tissue…

Question 3

New Cells Must Have the Same ___________ Information as the Originals so they can do the Same ______.

Answer 3

Genetic…Job…

Question 4

Each of Your Cells has a Nucleus that Contains _______________.

Answer 4

Chromosomes.

Question 5

Chromosomes Carry the ________ that Contain the Instructions for Making Both _____ Cells and all the Tissues and Organs Needed to Make an Entire New You.

Answer 5

Genes…New…

Question 6

A Gene is a Small Packet of Information that Controls a ________________ of your Body. It is a Section of ______, the Unique Molecule that Makes Up Your Chromosomes.

Answer 6

Characteristic…DNA…

Question 7

Most of Your Characteristics are the Result of Many Different Genes Rather than a __________ Gene. The Genes are Grouped Together on Chromosomes. A _________________ may Carry Several Hundred or Thousand Genes.

Answer 7

Single…Chromosome…

Question 8

How Many Chromosomes do we have in the Nucleus of our Body Cells?

Answer 8

46.

Question 9

How Many Pairs of Chromosomes are there?

Answer 9

23.

Question 10

In Each Pair of Chromosomes, One Chromosome is Inherited From the _________ and One From the _________.

Answer 10

Father…Mother…

Question 11

Sex Cells (___________) Only Have One Chromosome from Each Pair, so Only have ____ Chromosomes in Total.

Answer 11

Gametes…23…

Question 12

Body Cells Divide in a Series of Stages Known as the Cell _________.

Answer 12

Cycle.

Question 13

What is Stage 1 of the Cell Cycle?

Answer 13

The Longest Stage. Replication of DNA to Form Two Copies of Each Chromosome and Synthesis of New Sub-Cellular Structures. The Cells Grow Bigger Increase in Mass, Increase the Number of Sub-Cellular Structures Such as Mitochondria, Ribosomes or Chloroplasts.

Question 14

What is Stage 2 of the Cell Cycle?

Answer 14

Mitosis (Nucleus Divides). In this Process, One Set of Chromosomes is Pulled to Each End of the Dividing Cell and the Nucleus Divides.

Question 15

What is Stage 3 of the Cell Cycle?

Answer 15

Cell Divides into Two. This is the Stage During which the Cytoplasm and the Cell Membranes Also Divide to Form Two Identical Daughter Cells.

Question 16

Cell Division in the Cell Cycle Involves a Process Called ___________ and it Produces Two ___________ Cells.

Answer 16

Mitosis…Identical…

Question 17

Cell Division by Mitosis Produces the Additional Cells Needed for Growth and Development in ________________ Organisms, and for the Replacement of Worn Out or _____________ Cells.

Answer 17

Multicellular…Damaged…

Question 18

In ____________ Reproduction, the Cells of the Offspring are Produced by Mitosis From the Cells of Their _________. This is Why they Contain Exactly the Same Genes as their Parent with Little or No Genetic _____________.

Answer 18

Asexual…Parent…Variation…

Question 19

How long can the Cell Cycle Take?

Answer 19

Between 24 Hours and Several Years Depending on the Cells Involved and the Stage of Life of the Organism.

Question 20

At what Point Does the Cell Cycle Slow Down?

Answer 20

After Puberty.

Question 21

In Som Parts of an Animal or Plant, ___________ Cell Division Carries on Rapidly All the Time.

Answer 21

Mitotic.

Question 22

About ______ Million of Your Body Cells Die Every Minute, so Cell Division by _____________ is Very Important.

Answer 22

300…Mitosis…

Question 23

In a Child, __________ Divisions Produce New Cells Faster than the Old Ones Die. As an Adult, Dell Death and ___________ Keep More or Less in Balance. When You’re Elderly, Mitosis Slows Down and You Show the Typical Signs of ___________.

Answer 23

Mitotic…Mitosis…Ageing…