Flashcards in Biology - Topic 1 - Key Concepts in Biology Deck (74)
What does a microscope do?
makes small objects appear larger/magnifies small objects
What part of a microscope do you look through?
Which part of a microscope do you use to get a clear image?
the focusing wheel
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
A microscope has a ×5 eyepiece lens and a ×5 objective lens. What is the total magnification?
×25; 5 × 5 = 25
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
How many millimetres are there in a metre?
What unit is 1000 times smaller than a millimetre?
What is the unit symbol for a nanometre?
Name one part you could find in a plant cell but not an animal cell.
cell wall, chloroplasts, permanent vacuole
What process happens in a mitochondrion?
What is one function of a plant cell’s permanent vacuole?
to help keep the cell rigid/to store substances
In which part of a plant cell is cell sap stored?
In which part of a cell would you find chromosomes?
When you look down a microscope, what is the area that you see called?
field of view
Why can an electron microscope detect smaller structures in cells than a light microscope?
it has better magnification and better resolution
What is a picture taken with a microscope called?
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?
List three sub-cellular structures that are usually
found in animal cells.
cell membrane, nucleus, mitochondria, ribosomes
Which cell structure controls what enters and leaves the cell?
Which cell structure controls how the cell works?
Which plant cell structure contains chlorophyll?
What is the function of the cell structure that contains chlorophyll?
to capture energy from light for photosynthesis/to produce glucose using photosynthesis
Describe the function of the cell wall
supports and protects the cell
What is the function of ribosomes?
manufacture of proteins
What are gametes?
A bacterium is 20 µm long. How long is it in metres?
A bacterium is 5 µm wide. How wide is it in nanometres?
What do bacteria use to move themselves?