Cell division

Question 1

Cell continuity

Answer 1

all cells develop from existing cells

Question 2

chromosomes

Answer 2

structure made of DNA and protein which can be inherited

Question 3

diploid means =

Answer 3

contains 2 copies of each chromosomes

Question 4

haploid means =

Answer 4

contains 1 copy of each chromosome

Question 5

gametes are

Answer 5

sex cells

Question 6

chromatin

Answer 6

the long uncoiled form of chromosomes found in the nucelus when the cell is not dividing

Question 7

what is a gene

Answer 7

a section of DNA that codes for the production of a protein.

Question 8

the cell cycle is

Answer 8

the lifecycle of a cell

Question 9

10% of the time a cell is
90% of the time a cell is
(What stages)

Answer 9

10% = mitosis
90% = interphase

Question 10

how much of the time is a cell not dividing and what is this referred to as

Answer 10

90% of the time a cell is in interphase

Question 11

interphase is

Answer 11

the part of the cell cycle when a cell is not dividing

Question 12

cellular processes in interphase

Answer 12

protein synthesis
photosynthesis
respiration

Question 13

Organelles made in interphase

Answer 13

Chloroplasts
ribosomes
mitochondria

Question 14

biomolecules made in interphase

Answer 14

DNA/RNA
protein
fats
carbohydrates

Question 15

by the end of interphase what has happened

Answer 15

Dna has been replicated
chromatin had condensed = chromosomes are visable

Question 16

mitosis defintion

Answer 16

a form of nuclear division in which 1 nucleus divides to form 2 daughter nuclei, each containing the same amount of chromosomes with identical genes

Question 17

function of mitosis in unicellular organisms

Answer 17

asexual reproduction e.g yeast bacteria

Question 18

function of mitosis in multicellular organisms

Answer 18

growth and repair of cells

Question 19

stages of mitosis

Answer 19

Interphase
Prophase
Metaphase
Anaphase
Telophase

Question 20

What happens during Prophase

Answer 20

Nucleur membrane breaks down
Spindle fibres form centriole
Chromatin condenses into chromosomes

Question 21

What happens during Metaphase

Answer 21

Chromosomes line up at the equator
Spindle fibres are attached to chromosomes at the centromere

Question 22

What happens during Anaphase

Answer 22

Spindle fibres contract
Chromosomes are pulled apart to either side of the cell

Question 23

What happens during Telophase

Answer 23

Nuclear membrane reforms
Spindle fibres disappear
Chromosomes elongate into chromatin

Question 24

What is cytokinesis

Answer 24

When the entire cell splits after mitosis

Question 25

Cytokinesis in an animal cell

Answer 25

Cleavage furrow

Question 26

Cytokinesis in a plant cell

Answer 26

Cell plate to form cell wall

Question 27

Meiosis defintion

Answer 27

A form of nuclear division which produced 4 daughter nuclei with half the number of chromosomes and different genes leads to variation

Question 28

Mitosis or meiosis leads to variation

Answer 28

meiosis

Question 29

Cancer defintion

Answer 29

A group of disorders caused when cells lose the ability to control their rate of mitosis

Question 30

what is a benign tumour and example

Answer 30

non life threatening e.g wart

Question 31

what is a malignant tumour

Answer 31

life threatening

Question 32

causes of cancer

Answer 32

carcinogens such as UV radiation or cigarette smoke