B2

Question 1

What does the nucleus contain

Answer 1

Chromosomes

Question 2

What do the chromosomes contain

Answer 2

Genes that cointain instuction to for making new cell which in turn makes tissue and organ.

Question 3

Where is the gene found

Answer 3

In DNA

Question 4

What are your characteristics a result of

Answer 4

Of many genes instead of just one gene.

Question 5

A chromosome carries how many genes

Answer 5

Several hundred or even thousands

Question 6

How many chromosomes do we have in a nucleus and how are they arranged.

Answer 6

We have 46 chromosomes and they are arranged in pairs so we have 23 pairs.

Question 7

How are chromosomes inherited

Answer 7

In each pair of chromosomes one is inherited from your mother and one is inherited from your father

Question 8

Sex cells are called what

Answer 8

Gametes

Question 9

How many chromosomes do we have in a sex cell

Answer 9

23 in a total

Question 10

What is the name of a series in which the body cell divide.

Answer 10

Cell cycle

Question 11

What process does the cell cycle involve.

Answer 11

Mitosis

Question 12

What does the cell cycle/mitosis result in

Answer 12

Two identical (daughter) cell.

Question 13

What does it mean by the fact there is Two identical (daughter) cell

Answer 13

They have identical chromosomes and so the same genetic information.

Question 14

What does cell division by mitosis needed for

Answer 14

Growth and development in multicellular organism or worn replacement of worn or damaged cell.

Question 15

What happens in asexual reproduction.

Answer 15

The cells off the offspring are produced by mitosis from the cell of their parents. This why they are identical have no or little genetic variation

Question 16

Is the cell cycles length varied

Answer 16

Yes it can be as short as 24 hours or as long as severely years

Question 17

Where is cell cycle the fastest

Answer 17

As the baby is developing in the womb

Question 18

When does the cell cycle slow down

Answer 18

After puberty is fished

Question 19

Where does the cell cycle stay fast

Answer 19

In the hair follicles,the skin,the blood and the lining of the digestive system.

Question 20

Stage 1 of the cell cycle

Answer 20

• This is is longest stage in the cell cycle.
• cells grow bigger and increase their mass
• they carry out their normal activities
• the form two copies of each chromosomes
• they also increase the number of sub-cellular structure( mitochondrial,ribosomes,and chloroplasts)

Question 21

Stage 2 of the cell cycle

Answer 21

This is mitosis, each set of chromosomes are pulled toward each end of the dividing cel and the nucleus divides

Question 22

Stage 3 of the cell cycle

Answer 22

In this stage the cytoplasm of the cell membrane divide to form form two identical daughter cell

Question 23

What is mitotic cell division

Answer 23

This is cell division that is rapid and happens all the time like in skin

Question 24

What is is it called when cells change into a different cell

Answer 24

Differenetiate

Question 25

In early development plant and animal cells are unspecialised what is common name for them.

Answer 25

Stem cells

Question 26

What can stem cell do.

Answer 26

Become any cell that is needed

Question 27

When does most cells become specilised

Answer 27

Very early in life,by the time a baby is born most of its cells are specilised.

Question 28

How are specialised cells specialised

Answer 28

as genes turn on and some genes turn off

Question 29

How do specilised cells divide

Answer 29

Mitosis

Question 30

Specialised cells can form only the...

Answer 30

The same type of cells

Question 31

What differentiate cells cannot divide at all and what do they do too produce more cells

Answer 31

Blood cell and skin cells they use adult stem cells to produce more cells

Question 32

What is special about plants cells

Answer 32

They are able differentiate all through their lives

Question 33

Plant cells can...

Answer 33

Redifferentiate it can turn from one type of cell to another

Question 34

Undifferentiate cells are formed where

Answer 34

At the meristems

Question 35

What is a clone

Answer 35

Producing a identical offsping

Question 36

Why is it difficult to clone animal

Answer 36

As cloning requires undifferentiated cell and animals cells become differentiated early in life's

Question 37

What do eggs cell and sperm cells combine too form

Answer 37

A zygote

Question 38

Why do spinal injuries paryles

Answer 38

As nerve cells cannot be regenerated

Question 39

Uses of stem cell

Answer 39

Can treat spinal injuries and other stuff as they can be any cell that is needed.

Question 40

Stem cells in plants

Answer 40

Cloning plants quickly and economically, we can clone rare plants. we can also use this to research things on identical days

Question 41

Why do people find stem cell unethical

Answer 41

As the come from embryos which are potential humans

Question 42

What are the other issues with stem cells

Answer 42

It is slow difficult and expensive and we don't know exactly it works.