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AQA GCSE BIOLOGY EXAM| SET OF QUESTIONS
AND CORRECT ANSWERS ALREADY GRADED A+
GUARANTEED SUCCESS
What does the nucleus do?
contains genetic material that controls the activities of the cell
Where is chlorophyll found?
in the chloroplasts
How is water transported in the plant?
through the xylem
What is the cytoplasm?
gel-like substance where most of the chemical reactions happen. It contains
enzymes which control these chemical reactions
What is the cell membrane
holds the cell together and controls what goes in and out
How are sugars transported in plants?
through the phloem
Why do limiting factor graphs 'level off' after a certain point?
because the rate of photosynthesis can only be raised up to a certain point, until
something else becomes a limiting factor
At what temperature do the enzymes for photosynthesis become denatured?
45 degrees Celsius
How is light controlled in a green house?
light is always needed for photosynthesis so artificial light can be provided once
the sun goes down to give plants more photosynthesis time
What is the equation for photosynthesis?
, 2
Carbon dioxide + Water ---(sunlight)---> Glucose + Oxygen
What is a limiting factor?
something that is stopping photosynthesis happening faster
What are the three limiting factors in photosynthesis?
- light
- temperature
- carbon dioxide
What happens in the mitochondria?
these are where most of the reactions for respiration take place. Respiration
releases energy that the cell needs to work
What happens in the ribosomes?
these are where proteins are made in the cell
What does a bacterial cell NOT have?
a nucleus- genetic material floats in the cytoplasm
What is a yeast cell an example of?
a single cell organism
What does a yeast cell have?
- nucleus
- cytoplasm
- cell membrane
- surrounding cell wall
How is a leaf cell different from a yeast cell?
leaf cells have chloroplasts and a cellulose cell wall. yeast cells have neither
What is the definition of diffusion?
the SPREADING OUT of PARTICLES from an area of HIGH
CONCENTRATION to an area of LOW CONCENTRATION
, 3
or
the NET MOVEMENT of PARTICLES down a CONCENTRATION GRADIENT
What substances can diffuse through cell membranes?
small molecules like oxygen, glucose, amino acids and water
What substances can't diffuse through cell membranes?
big molecules like starch and proteins
What are some examples of diffusion?
- the diffusion of oxygen into the cells of the body from the bloodstream as the
cells are respiring (and using up oxygen)
- the diffusion of carbon dioxide into actively photosynthesising plant cells
- the diffusion of simple sugars and amino acids for the gut through cell
membranes
When, and in which direction, will diffusion take place in solutions and in gases?
- if two solutions are separated by a cell membrane, particles will move from a
region of high concentration to a region of low concentration
- gases will also diffuse through the air from a region of high concentration to a
region of low concentration
How is a leaf cell adapted to carry out photosynthesis?
- the leaf has mesophyll tissue
- the mesophyll cells contain chloroplasts which can photosynthesise
How are palisade cells adapted for photosynthesis?
- packed will chloroplasts for photosynthesis
AQA GCSE BIOLOGY EXAM| SET OF QUESTIONS
AND CORRECT ANSWERS ALREADY GRADED A+
GUARANTEED SUCCESS
What does the nucleus do?
contains genetic material that controls the activities of the cell
Where is chlorophyll found?
in the chloroplasts
How is water transported in the plant?
through the xylem
What is the cytoplasm?
gel-like substance where most of the chemical reactions happen. It contains
enzymes which control these chemical reactions
What is the cell membrane
holds the cell together and controls what goes in and out
How are sugars transported in plants?
through the phloem
Why do limiting factor graphs 'level off' after a certain point?
because the rate of photosynthesis can only be raised up to a certain point, until
something else becomes a limiting factor
At what temperature do the enzymes for photosynthesis become denatured?
45 degrees Celsius
How is light controlled in a green house?
light is always needed for photosynthesis so artificial light can be provided once
the sun goes down to give plants more photosynthesis time
What is the equation for photosynthesis?
, 2
Carbon dioxide + Water ---(sunlight)---> Glucose + Oxygen
What is a limiting factor?
something that is stopping photosynthesis happening faster
What are the three limiting factors in photosynthesis?
- light
- temperature
- carbon dioxide
What happens in the mitochondria?
these are where most of the reactions for respiration take place. Respiration
releases energy that the cell needs to work
What happens in the ribosomes?
these are where proteins are made in the cell
What does a bacterial cell NOT have?
a nucleus- genetic material floats in the cytoplasm
What is a yeast cell an example of?
a single cell organism
What does a yeast cell have?
- nucleus
- cytoplasm
- cell membrane
- surrounding cell wall
How is a leaf cell different from a yeast cell?
leaf cells have chloroplasts and a cellulose cell wall. yeast cells have neither
What is the definition of diffusion?
the SPREADING OUT of PARTICLES from an area of HIGH
CONCENTRATION to an area of LOW CONCENTRATION
, 3
or
the NET MOVEMENT of PARTICLES down a CONCENTRATION GRADIENT
What substances can diffuse through cell membranes?
small molecules like oxygen, glucose, amino acids and water
What substances can't diffuse through cell membranes?
big molecules like starch and proteins
What are some examples of diffusion?
- the diffusion of oxygen into the cells of the body from the bloodstream as the
cells are respiring (and using up oxygen)
- the diffusion of carbon dioxide into actively photosynthesising plant cells
- the diffusion of simple sugars and amino acids for the gut through cell
membranes
When, and in which direction, will diffusion take place in solutions and in gases?
- if two solutions are separated by a cell membrane, particles will move from a
region of high concentration to a region of low concentration
- gases will also diffuse through the air from a region of high concentration to a
region of low concentration
How is a leaf cell adapted to carry out photosynthesis?
- the leaf has mesophyll tissue
- the mesophyll cells contain chloroplasts which can photosynthesise
How are palisade cells adapted for photosynthesis?
- packed will chloroplasts for photosynthesis
