B2

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what three things does a plant cell that an animal cell doesn't?
A cell wall, a permanent vacuole and chloroplast.
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What is the definition of diffusion?
The spreading of particles from an area of high concentration to a low concentration.
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Name 2 substances that can pass through a cell membrane.
Glucose/oxygen/amino acids.
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Name 2 substances that can't pass through a cell membrane.
Proteins/carbohydrates/starch.
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Why might a blood cell have no nucleus?
To fit in more haemoglobin.
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What is an organ?
A group of different tissues that work together to perform a certain function.
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What is the equation for photosynthesis?
water+Carbon dioxide-->Glucose+oxygen
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What the function of the phloem in a plant?
Transport food around the plant.
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Why is there lots of chloroplast in the upper epidermis?
They contain chlorophyll which absorbs the sunlight for photosynthesis.
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Name 3 ways in which plants use glucose.
Making cell walls, making proteins (combine with nitric acid) and store as starch.
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Name two pieces of equipment you could use to measure the distribution of organisms.
Quadrats and a transects.
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How do you use a transect?
Mark out the line you want to study using tape, then count the organisms touching the lines and record it.
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How would you make your results of a quadrat/transect more reliable?
Take a larger sample size(as many quadrats/transects as possible) and use random samples.
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Give two examples of enzymes and what they do.
amylase breaks down starch Protease breaks down proteins and Lipase breaks down lipids(fats).
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Where would you find Amylase in the human?
In the Salivary glands (saliva) or the small intestine.
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Where is bile produced and stored?
produced by the liver and stored in the gall bladder..
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What enzymes are produced by the Small intestine?
Protease, amylase and lipase.
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What is respiration?
The process of releasing energy from glucose (which happens in every cell).
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When would you use Anaerobic respiration?
When doing vigorous exercise and your muscles cant get enough oxygen.
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What's the word equation for Aerobic respiration?
Glucose+oxygen--> Carbon dioxide +water (+energy).
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Name 1 example of when enzymes are used in the industry.
Isomerase for making fructose or protease for pre-digesting baby food.
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What are 2 disadvantages of using enzymes?
Allergies/can be denatured/expensive.
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What are chromosomes?
Long molecules of DNA.
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What is a gene?
A section of DNA.
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What are two examples where DNA fingerprinting is used?
Forensic science and paternity tests.
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What's the difference between mitosis and meiosis?
Mitosis has 1 division and makes 2 identical offspring and meiosis has 2 divisions and makes 4 gametes.
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Where are the two main places Stem cells can be harvested from?
Embryos(embryonic stem cells) and adult bone marrow.
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Why are some people against stem cell research?
Harms/destroys embryos which are a potential life.
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Which of the X and Y chromosomes are the cause of male characteristics?
The Y chromosome causes male characteristics.
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What do genetic diagrams show?
The possible genes of the offspring.
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Who was Mendel?
He found different height characteristics of pea plants being passed on and this was the foundations of modern genetics.
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What is a genotype and phenotype?
A genotype is what alleles you have and a phenotype is the actual characteristics.
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Name a genetic disorder caused by a recessive allele.
Cystic fibrosis (body produces a lot of mucus in the air passages and pancreas).
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Name a genetic disorder cause bya dominant allele.
Polydactyly (Extra fingers or toes).
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What are fossils?
Remains of organisms form many years ago which are found in rocks.
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Name 2 ways which a fossil can form.
From casts or preservation.
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What is a species?
A group of similar organisms that can reproduce to give fertile offspring.
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What is speciation?
The development of new species.
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How can a physical barrier cause variation?
Different conditions on one side of the barrier cause the species to evolve and become more adapted to the new conditions.
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Other cards in this set

Card 2

Front

What is the definition of diffusion?

Back

The spreading of particles from an area of high concentration to a low concentration.

Card 3

Front

Name 2 substances that can pass through a cell membrane.

Back

Preview of the front of card 3

Card 4

Front

Name 2 substances that can't pass through a cell membrane.

Back

Preview of the front of card 4

Card 5

Front

Why might a blood cell have no nucleus?

Back

Preview of the front of card 5
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