Revision

Question 1

Eukaryotic

Answer 1

Eukaryotic means “True nucleus”

It is a cell with a nucleus

Question 2

3 organelles in plants but not in animals

Answer 2

Vacuole
Cell wall
Chloroplats

Question 3

What do bacterial cells have instead of a nucleus

Answer 3

Nucleoid

Question 4

Magnification equation

Answer 4

Size of image/real size of the image

Question 5

image size equation

Answer 5

Number of pixels = number of inches x pixels per inch

Question 6

Why stain the cells when looking at them under a microscope?

Answer 6

Because it outlines the cells so they are easier to spot

Question 7

What is a specialised cell

Answer 7

Cells that have developed certain characteristics to perform a particular function

Question 8

6 types of specialised cells

Answer 8

Red blood cell
Muscle cell
Xylem/Phloem cell
Sperm cell
Nerve cell
Root hair cell

Question 9

How many chromosomes in a human cell

Answer 9

64 or 32 pairs

Question 10

What are the main stages of cell cycle?

Answer 10

Mitosis
Interphase
Cytokinesis

Question 11

Individual steps of mitosis

Answer 11

Cell begins to divide
The DNA replicates
The membrane breaks down the chromosomes
One set of chromosomes are pulled to each end of the cell and the nucleus divides
The cytoplasm and cell membranes divide to form two identical cells

Question 12

Why are there ethical issues surrounding stem cells?

Answer 12

Some people classify it as murder

Question 13

What is a meristem cell?

Answer 13

A tissue in most plants containing undifferentiated cells

Question 14

What is diffusion?

Answer 14

Diffusion is the act of particles moving across a membrane from an area of high concentration to low concentration