B1

How many micrometres are there in 1 metre?
1000000
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What kind of microscope do we use at school?
Light
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What kind of microscope allowed biologists to see and understand more about subcellular structures inside cells?
Electron microscope
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How can you calculate real size of a microscope image?
Image size/magnification
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What is 3.45x10-4 ?
0.000345
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What determines how much detail a microscope can show?
Resolving power
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What kind of cell contains genetic material enclosed in a nucleus?
Eukaryotic
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What kind of cell does not have a nucleus?
Prokaryotic/bacterial
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Are eukaryotic cells smaller or prokaryotic cells?
Prokaryotic cells
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What is the function of the nucleus?
Holds DNA
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What is the function of the cytoplasm?
Chemical reactions
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What is the function of the cell membrane?
Controls what goes in and out of the cell
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What is the function of mitochondria?
Site of aerobic respiration
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What is the function of ribosomes?
Site of protein synthesis
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What is the function of chloroplasts?
Site of photosynthesis
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What is the function of chlorophyll?
Absorbs sunlight for photosynthesis
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What is the vacuole filled with?
Cell sap
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What are plant and algal cells walls made of?
Cellulose
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Which specialised cell contains lots of mitochondria?
Sperm cell
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Which specialised cell has a long axon?
Nerve cell/neurone
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Which specialised cells contain protein that slide over each other and store glycogen?
Muscle cells
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Which specialised cells have a large surface area, permanent vacuole and lots of mitochondria for active transport?
Root hair cell
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Which specialised cells have broken down cell walls that form sieve plants and are supported by companion cells?
Phloem cells
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Which specialised cells become lignified and die?
Xylem cells
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With a suitable temperature and nutrients, how often can some bacteria divide?
Every 20 mins
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What 2 things can you grown bacteria on?
Nutrient broth solution or agar gel
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What is used to transfer microorganisms onto the media?
Inoculating loop
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How should you store a petri dish?
Upside down
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At what temperature should you incubate cultures?
25
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How do you calculate the zone of inhibition?
πr2
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Where are the chromosomes found?
Nucleus
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What are the 3 stages of the cell cycle?
Genetic material is doubled then divided into 2 identical cells, growth and production of sub-cellular structures, mitosis (chromosomes pulled to each end of the cell and nucleus divides)
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What is an undifferentiated cell of an organism that can give rise to many more cells of the same type and from which certain cells can arise from (differentiation)?
Stem cell
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Which tissue can develop into any type of plant cell throughout its life?
Meristem
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What may stem cells be used to help treat?
Diabetes, paralysis
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Give a disadvantage of using stem cells
Potential risks such as viral transfer, ethical or religious objections
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What is diffusion?
The spreading out of particles from a high concentration to a low concentration
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Which 3 factors affect the rate of diffusion?
Concentration gradient, temperature, surface area
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What is the effectiveness of an exchange surface increased by?
Large SA, thin, efficient blood supply & being ventilated to maintain the concentration gradient
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What is osmosis?
Diffusion of water from a dilute to a more concentrated solution through a partially permeable membrane
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What does active transport require?
Energy
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Other cards in this set

Card 2

Front

What kind of microscope do we use at school?

Back

Light

Card 3

Front

What kind of microscope allowed biologists to see and understand more about subcellular structures inside cells?

Back

Preview of the front of card 3

Card 4

Front

How can you calculate real size of a microscope image?

Back

Preview of the front of card 4

Card 5

Front

What is 3.45x10-4 ?

Back

Preview of the front of card 5
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