B1

Question 1

Bacterial cells are examples off…

Answer 1

the bacterial cell is an example of prokaryotic cells

Question 2

What does a prokaryotic cell contain?

Answer 2

the prokaryotic cell contains
cytoplasm
Cell membrane
cell wall

Question 3

Use of a magnitude

Answer 3

the use of magnification is used to give the idea of how big or small something is

Question 4

How to find the difference in magnitude

Answer 4

Find the differences in magnitudes find the difference (-) the powers of 10

Question 5

what does an Animal cell contain

5

Answer 5

Animal cell contains

• nucleus
• cytoplasm
• cell membrane
• motrochondria
• ribosomes

Question 6

What does a plant cell contain

5

Answer 6

plant cell contains:

• nucleus
• cell wall
• vacuole
• chloroplast
• cytoplasm

Question 7

what does a Nucleus do?

Answer 7

the nucleus contains all the genetic material and controls the activities

Question 8

what does a cytoplasm do?

Answer 8

The cytoplasm is where all the chemical reaction takes place and is like a jelly substance

Question 9

what does a cell membrane do?

Answer 9

Controls what goes in and out of the cell

Question 10

what do the mitochondria do?

Answer 10

Mitochondria is where aerobic respiration takes place

Question 11

What do the Ribosomes do?

Answer 11

Ribosomes are where protein synthesis place

Question 12

What does the cell wall do?

Answer 12

The cell wall provides structure and is made of cellulose

Question 13

what does the chloroplast do?

Answer 13

The chloroplast is a green substance that absorbs light for photosynthesis

Question 14

what does the vacuole do?

Answer 14

the vacuole is made of cell sap and gives support

Question 15

An electron microscope has a…

Answer 15

electron microscope has a higher magnification and travels in power

Question 16

The benefit of using an electron microscope?

Answer 16

able to study in much detail (cells has a finer detail )

Question 17

the disadvantage of electron microscope

Answer 17

the disadvantage of an electron microscope is that it’s more expensive

Question 18

How to work out the MAGNIFICATION

Answer 18

Size of Magnification=
size of an image (dived) size of real obj
[image/ real]

Question 19

When does the animal cell develope

Answer 19

animal cell develops at the early stages

Question 20

why is the cell division restricted in a mature animal cell?

Answer 20

a mature animal cell is mainly restricted to repair and replace

Question 21

when does a plant cell differentiate?

Answer 21

a plant cell differentiates throughout life

Question 22

How often does cell division (binary fission) take place

Answer 22

cell division (binary fission) occurs every 20 minutes depending on the nutrients and temperature

Question 23

to grow an uncontaminated sample of bacterial its necessary to work ____

Answer 23

to grow an uncontaminated sample work
aseptically
- in a lab and free of pathogens

Question 24

what must be done when carrying out an uncontaminated sample?

Answer 24

make sure…

• petri dish= sterilised (free from bacteria)
• sterilised through a flame
• the lid of the petri dish to be opened as little as possible
• stored upside down

Question 25

How to calculate the number of bacteria over a certain time

Answer 25

work out many times the bacteria has divided 1) multiply the starting number by 2 2) then multiply that number by 2 and so on - x2 as many times the bacteria divided

Question 26

is stem cell... | differentiated or undifferentiated?

Answer 26

stems cells are undifferentiated

Question 27

where are stem cells from?

Answer 27

stem cells are from human embryos and can be cloned into most different human cells

Question 28

where can Meristem tissue be found? and where does it differentiate?

Answer 28

Meristem tissue are in plant cell and can be differentiated in any plant cell

Question 29

what are the potential risks of stem cells

Answer 29

stem cells have risks of transferring viral infections and people have ethical/ religious rejections.

Question 30

stem cells can be used to produce clones quickly, what are the benefits?

Answer 30

prevent the extinction of plants and can produce large numbers of identical plants at once

Question 31

name 2 gases that are exchanged in a leaf

Answer 31

Water, oxygen or carbon dioxide is exchanged in a leaf

Question 32

What is the function of the alveoli

Answer 32

The function of the alveoli is for rapid transfer of blood and the REMOVAL of the carbon dioxide

Question 33

what plant cell is used to absorb water from the soil?

Answer 33

root hair cell is used to absorb water from minerals

Question 34

What is the function of xylem?

Answer 34

The function of xylem is to transport water into the plant

Question 35

what is the function of the nerve cell?

Answer 35

The function of the nerve cell is to carry around electrical impulse from one part of the body to another

Question 36

are chromosomes normally found in pair or triplets?

Answer 36

Chromosomes are found in pairs ( one from the mother and one from the father)

Question 37

what is mitosis? what is it used for?

Answer 37

mitosis is the stage when the cells divide | it's used to grow or replace damaged cells

Question 38

What is meant by the "mean division time" of a bacterial cell

Answer 38

Mean of division= the average time for a cell to divide into 2

Question 39

what does a stem cell have the ability to do?

Answer 39

A stem cell has the ability to become a different type of cell

Question 40

Name a gas molecule that can diffuse through the cell membrane?

Answer 40

Oxygen and carbon dioxide can diffuse through a cell membrane

Question 41

osmosis is a... a) fully permeable membrane b) partially permeable membrane

Answer 41

Osmosis is a partially/semipermeable membrane

Question 42

What is active transport?

Answer 42

Active transport is the movement between a substance from a Lower to a HIGHER concentration using energy from respiration

Question 43

Difference between ACTIVE TRANSPORT and OSMOSIS

Answer 43

A difference between active transport and osmosis is that... - Active transport needs energy - osmosis needs water ACTIVE transport travels from a LOWER to a HIGHER concentration OSMOSIS travels from a HIGHER to LOWER concentration

Question 44

What do fungi have? | 6

Answer 44

Fungis has a | the nucleus, cell membrane, cell wall, cytoplasm, ribosomes and vacuole

Question 45

what does yeast cell contain? | 4

Answer 45

Yeast cell contains | Nucleus, cytoplasm, cell membrane and a cell wall

Question 46

Name 3 specialised cells

Answer 46

specialised cells: Red blood cell - carries oxygen to blood tissue Phloem cell - Transportation of sugar Xylem cell - Transportation of water and minerals

Question 47

What substances pass through cell membranes via diffusion? | 5/6

Answer 47

The substance that passes through the cell membranes using diffusion is... Oxygen, carbon dioxide, glucose, amino acids, water and nutrients

Question 48

Cell division is another word for ------

Answer 48

Binary fission