Layer C, Task 3

Question 1

Mitosis

Answer 1

Type of cell division done by most body cells that help organisms
- Grow in size
- Repair damaged tissue

Question 2

Why shouldn’t cells divide all the time?

Answer 2

Leads to cancer (uncontrolled cell growth)

Question 3

What phase is the longest part of the cell cycle?

Answer 3

Interphase

Question 4

Interphase

Answer 4

Cell grows, replicates its DNA and carries out daily cell functions

Question 5

3 stages of interphase

Answer 5

G1 - cell growth
S - DNA synthesis (replication of DNA)
G2 - cell growth

Question 6

What part of a cell contains DNA?

Answer 6

Nucleus, where DNA is organized into chromosomes

Question 7

Chromosomes are duplicated in interphase but the chromosome number remains the same. Why?

Answer 7

Chromosomes are counted by the number of centromeres, which is where the 2 sister chromatids are attached

Question 8

Mitosis stages of division

Answer 8

1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

Question 9

Prophase

Answer 9

Chromosomes in the nucleus are condensing (thickening and visible)

Question 10

Metaphase

Answer 10

Chromosomes line up in the middle of the cell, nucleus disassembled

Question 11

Anaphase

Answer 11

Chromosomes move to opposite sides (poles) of cell (spindles help move the chromosomes)

Question 12

Telophase

Answer 12

New nuclei are forming on each side to make 2 new cells

Question 13

Cytokinesis

Answer 13

Splits the cytoplasm

Question 14

Asexual reproduction

Answer 14

Producing offspring from only 1 parent
Offspring genetically identical to parent

Question 15

Sexual reproduction

Answer 15

Producing offspring by the fusion of 2 gametes (parental cells that contain only half the DNA usually found in a cell)
Offspring has genetic info from each parent

Question 16

Cell division helps organisms grow in size. Why does the. number of cells increase instead of the size of cells?

Answer 16

When the cell gets too large, chemicals and water cannot move through fast enough

Question 17

Why is water important in cells?

Answer 17

Many chemicals must be dissolved in water for chemical reactions

Question 18

Diffusion

Answer 18

Chemicals move from area of higher to lower concentration

Question 19

Osmosis

Answer 19

Movement of water toward area of high concentration