Biology - Topic 1 - Key Concepts in Biology Flashcards Preview

GCSE Science Edexcel 2016 Onwards > Biology - Topic 1 - Key Concepts in Biology > Flashcards

Flashcards in Biology - Topic 1 - Key Concepts in Biology Deck (74)
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1

What does a microscope do?

makes small objects appear larger/magnifies small objects

2

What part of a microscope do you look through? 

eyepiece lens

3

Which part of a microscope do you use to get a clear image?

the focusing wheel

4

Put these in order of size, biggest first: atom, animal cell, cell nucleus, muscle tissue, protein molecule, water molecule 

muscle tissue, animal cell, cell nucleus, protein molecule, water molecule, atom 

5

A microscope has a ×5 eyepiece lens and a ×5 objective lens. What is the total magnification?

×25; 5 × 5 = 25

6

A human hair has a width of 100 µm but appears 20 mm wide in a photo. What magnification is the photo? 

×200; 20 mm = 20 000 µm; 20 000 ÷ 100 = 200

7

How many millimetres are there in a metre? 

1000

8

What unit is 1000 times smaller than a millimetre?

micrometre, µm

9

What is the unit symbol for a nanometre?

nm

10

Name one part you could find in a plant cell but not an animal cell.

cell wall, chloroplasts, permanent vacuole

11

What process happens in a mitochondrion?

aerobic respiration

12

What is one function of a plant cell’s permanent vacuole?

to help keep the cell rigid/to store substances

13

In which part of a plant cell is cell sap stored?

vacuole

14

In which part of a cell would you find chromosomes?

nucleus

15

When you look down a microscope, what is the area that you see called?

field of view

16

Why can an electron microscope detect smaller structures in cells than a light microscope?

it has better magnification and better resolution

17

What is a picture taken with a microscope called?

micrograph

18

Some microscope pictures have a small line drawn on them with information about how long the line is when unmagnified. What is this line called?

scale bar

19

List three sub-cellular structures that are usually
found in animal cells.

cell membrane, nucleus, mitochondria, ribosomes

20

Which cell structure controls what enters and leaves the cell?

cell membrane

21

Which cell structure controls how the cell works?

nucleus

22

Which plant cell structure contains chlorophyll?

chloroplast

23

What is the function of the cell structure that contains chlorophyll?

to capture energy from light for photosynthesis/to produce glucose using photosynthesis

24

Describe the function of the cell wall

supports and protects the cell

25

What is the function of ribosomes?

manufacture of proteins

26

What are gametes?

sex cells

27

A bacterium is 20 µm long. How long is it in metres?

0.00002 m

28

A bacterium is 5 µm wide. How wide is it in nanometres?

5000nm

29

What do bacteria use to move themselves?

flagella

30

Animal and plant cells are eukaryotic. What word describes bacterial cells?

prokaryotic